Understand the basic functions of high frequency welded pipe equipment welded pipe sizing
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【概要描述】The welded pipe sizing of high frequency welded pipe equipment refers to rolling the welded pipe through a specific pass roll, and adjusting the round or special-shaped pipe with irregular size and shape to one with regular shape and size that meets the requirements of the standard. Finished tube.
Understand the basic functions of high frequency welded pipe equipment welded pipe sizing
【概要描述】The welded pipe sizing of high frequency welded pipe equipment refers to rolling the welded pipe through a specific pass roll, and adjusting the round or special-shaped pipe with irregular size and shape to one with regular shape and size that meets the requirements of the standard. Finished tube.
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- Release time:2022-05-22 11:30
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The welded pipe sizing of high frequency welded pipe equipment refers to rolling the welded pipe through a specific pass roll, and adjusting the round or special-shaped pipe with irregular size and shape to one with regular shape and size that meets the requirements of the standard. Finished tube.
The basic functions of the sizing process have four aspects: ① Determine the basic size and shape of the welded pipe. ②Reduce stress. ③ Reach the straightness of the entry. ④ Improve the surface quality of the welded pipe.
1.Determine the basic size and shape of the welded pipe
(1) Circle → Circle. Through the adjustment of the sizing round hole type roll, the irregular round pipe to be sized after the extrusion roll is adjusted into a finished round pipe with qualified cross-sectional shape and size. Measuring the roundness of a round tube depends not only on the distribution of the actual tolerance zone, but also on the ovality of the tube. It is generally specified that the ovality is 80% of the limit deviation. In practice, although some welded pipes are not out of tolerance, but they exceed the ovality tolerance, or the tolerance zone and are close to the limit value, they also need to be adjusted.
(2) Circle → Square (different). That is to say, from a round tube to a special-shaped tube, by adjusting the special-shaped hole-shaped roll, the welded tube with a round cross-section after the extrusion roll is adjusted to a special-shaped tube with different cross-sectional shapes and sizes, such as square tubes, Rectangular tube, oval tube, D-shaped tube, etc. In fact, no matter how complex the special-shaped tube, the adjustment process is nothing more than around the surface, angle, shape and tolerance.
①Surface: including plane and camber. It is required that there should be no waves, streaks and bamboo joints when viewed vertically. The camber must be smooth without edges and corners when viewed horizontally, and there should be no bumps on the plane.
②Angle: one refers to the shape, size and symmetry of the sharp corner at the intersection of the welded pipe surface and the surface, and the other refers to the angle between the welded pipe surface and the surface. Taking the rectangular tube as an example, if there is no special requirement, it is generally specified that the outer fillet r=1.5t, and the surface-to-surface angle β=90°±1°.
③Shape: Refers to the appearance of circular deformed welded pipes, such as square and rectangular pipes, which must look regular in shape, flat and sharp, with clear edges and corners, and are not allowed to appear rhombus, trapezoid, concave-convex, bending and twisting, etc.
④Tolerance: For square and rectangular tubes, including width, height, angle, straightness, diagonal, r angle, parallelism, weld position (if no special requirements), internal burr height and tube wall thickness, etc. All belong to the category that the sizing process needs to be controlled.
(3) Square → Square. In the direct forming process, for the special-shaped tubes whose size and shape do not meet the standard requirements after extrusion rolls, the shape and size tolerances can meet the requirements by adjusting the special-shaped rolls.
2.Reduce stress
The welded pipe produced by the high frequency welded pipe equipment will be formed, welded and cooled to become the welded pipe to be sized. In this pipe body, a large amount of longitudinal residual stress and transverse residual stress are accumulated. If part of the residual stress in the pipe is reduced without the shaping and rolling of the sizing roller, the welded pipe production can not be carried out normally just because of the bending caused by the stress.The bent welded pipe itself shows that there is a tendency for longitudinal residual stress in the pipe.
(1) Reduction mechanism of longitudinal residual stress. The welded pipe to be sizing is always upturned along the welding seam. When the upturned welded pipe is rolled by several flat and vertical sizing rollers arranged in a straight line, the welded pipe obtains an upward rolling force, so that the upturned welding seam part is rolled from the bottom. The concave arc becomes a straight line and is then elongated, which increases the tensile stress at the weld and reduces the compressive stress at the weld, thereby reducing the vector algebraic sum of the residual stress at the weld to achieve a basic balance; At the same time, the concave arc on the back of the weld is also straightened, compressed and shortened, which increases the compressive stress on the back of the weld and reduces the residual tensile stress at this part. The longitudinal residual stress of the welded pipe tends to be basically balanced in this increase and decrease. In this way, the longitudinal residual stress represented by the welding seam and the back of the welding seam is very small, and the welded pipe after the sizing roller is straight. The same is true for left and right bending.
(2) Reduction mechanism of transverse residual stress. There is a large amount of transverse residual tensile stress in the welded pipe to be sized. These transverse tensile stresses are not only caused by the welding and cooling process, but also left by the transverse deformation of the tube blank during the forming process, and the overall performance is tensile stress; full of transverse tensile stress to be determined After the diameter pipe is subjected to the radial rolling force exerted by the sizing roll, its circumference is slightly shortened, and the pipe wall obtains radial compressive stress, which offsets most of the transverse tensile stress in the welded pipe to be sizing. It is futile to try to completely eliminate the transverse tensile stress in the welded pipe through the sizing process, and there will be more or less residual transverse tensile stress in the cross section of the welded pipe after sizing. To completely eliminate the transverse tensile stress in the welded pipe as much as possible, it can be accomplished by the subsequent heat treatment process, which will not be repeated here.
As a proof, when producing high-strength pipes such as 16Mn or Q345 welded pipes, if the welding process is slightly improper, the welded pipes will automatically burst during the sizing process or just after leaving the sizing roll gap; and like Q195 welded pipes, Bursting only occurs when the welding process is seriously inappropriate. More often, when a welded pipe with a large residual transverse tensile stress is used as a conveying pipe, the internal pressure of the pipe and the residual transverse tensile stress are superimposed, resulting in the welded pipe sometimes bursting at a very low pressure.
3. To achieve basic straightness
In the practice of producing welded pipes by high frequency welded pipe equipment, there are two understandings of straightness. One is the straightness stipulated by the international regulations, the round tube is not more than 2‰, and the special-shaped tube is not more than 3‰; the other is the usability straightness, and the index requirements are negotiated by both parties. The former applies to "market goods" and the user is not fixed; the latter applies to specific users who make requests. No matter what kind of straightness, only the rolling of the sizing roller can balance the internal stress of the pipe and make the welded pipe reach the basic straightness.
4. improve the surface quality of welded pipes
The promotion effect of the sizing roller on the surface quality of the welded pipe is mainly manifested in three aspects:
(1) Promote the smoothness of the weld. After removing the outer burr, the weld surface and the outer circle of the welded pipe are always connected rather than tangent, and there are edges and corners when they are connected; the edges and corners can always be seen and felt by hand at the weld on the pipe surface, which is extremely unsightly. Only after several passes of sizing roll rolling can the edges and corners of the weld surface and the pipe surface be eliminated to achieve smoothness.
(2) Reduce surface indentation and scratches. From the forming of the tube blank to the completion of the welding, it is necessary to go through the rolling and high-temperature welding of 20 to 30 rollers (more rows of rollers are formed), and any link may leave scars and imprints on the surface of the welded tube. After rolling with sizing rolls, some of the scars and marks will become lighter and become untouched.
(3) Prevent the sizing section itself from producing scars. It is required to carefully adjust the symmetry of the sizing pass, apply the rolling force correctly, and ensure that the surface of the welded pipe is free from surface defects such as indentation and scratches.
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Time of issue : 2025-05-17
Introduction
In the production process of used welding tube machines, the leveling machine (also called straightener or flattening machine) serves as a critical component that significantly impacts final product quality. This article examines in detail the functions, working principles, and importance of leveling machines in used welding tube machines, providing valuable insights for operators and purchasers of second-hand equipment.
1. Primary Functions of Leveling Machines
(1) Material Flattening
Eliminates coil set (longitudinal curvature) from steel strips
Removes crossbow (transverse curvature) in the material
Corrects edge wave and center buckle defects
(2) Surface Preparation
Removes minor surface imperfections
Creates optimal surface condition for welding
Reduces mill scale and oxidation layers
(3) Tension Control
Provides consistent material tension before forming
Prevents material slippage during processing
Maintains uniform speed through the production line
2. Working Principle
(1) Mechanical Structure
In used welding tube machines, typical levelers consist of:
5-9 precision-ground work rolls
Heavy-duty frame construction
Adjustable roll gap mechanisms
Drive motor and gear reduction system
(2) Operational Process
Coiled strip enters the leveler
Multiple bending cycles through alternating rolls
3- Progressive flattening through each roll station
Precisely straightened material exits to forming section
3. Importance in Tube Production
(1) Weld Quality Improvement
Ensures perfect edge alignment for welding
Eliminates gaps that cause weak welds
Reduces weld flash and spatter
(2) Dimensional Accuracy
Maintains consistent strip width
Prevents tube ovality issues
Ensures uniform wall thickness
(3) Equipment Protection
Reduces forming roll wear
Prevents excessive load on welder
Extends overall machine life
4. Key Components in Used Machines
When evaluating levelers in used welding tube machines, inspect:
(1) Roll Condition
Surface finish and diameter uniformity
Bearing condition and lubrication
Roll alignment and parallelism
(2) Adjustment Mechanisms
Roll gap adjustment functionality
Pressure application systems
Quick-change features for different materials
(3) Drive Systems
Motor power and condition
Gearbox operation and noise levels
Speed synchronization with main line
5. Maintenance Considerations
For levelers in used welding tube machines:
(1) Regular Maintenance
Daily roll cleaning
Weekly bearing lubrication
Monthly alignment checks
(2) Common Issues
Roll surface scoring
Bearing failures
Hydraulic system leaks
Drive chain/belt wear
(3) Upgrade Options
Adding roll polishing systems
Installing automatic gauge control
Upgrading to servo-driven adjustment
6. Material Compatibility
Levelers in used welding tube machines handle:
(1) Material Types
Cold rolled steel
Hot rolled steel
Galvanized steel
Stainless steel (with proper roll finish)
(2) Thickness Range
Typically 0.5mm to 6.0mm
Special heavy-duty models up to 12mm
(3) Width Capacity
Standard models: 150mm to 600mm
Wide models: up to 1500mm
7. Process Integration
(1) Positioning in Production Line
After uncoiler and before forming section
Often combined with edge trimming
Sometimes integrated with cleaning systems
(2) Synchronization Requirements
Speed matching with main line
Tension coordination with accumulator
Feed rate optimization
8. Cost-Benefit Analysis
For used welding tube machines:
(1) Value Contribution
Improves product quality by 30-40%
Reduces scrap rate by 15-25%
Increases production speed potential
(2) Operational Costs
Energy consumption 5-15kW typical
Spare parts availability
Labor requirements
(3) Return on Investment
Payback period typically 6-18 months
Quality improvements justify cost
Essential for precision tube production
Conclusion
The leveling machine in used welding tube machines plays a fundamental role in ensuring product quality, process stability, and equipment longevity. When purchasing or operating second-hand equipment, special attention should be paid to the condition and capabilities of the leveling system. Proper maintenance and potential upgrades of this component can significantly enhance the performance and value of used welding tube machines, making it a critical focus area for tube producers looking to optimize their operations.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
Introduction
In the production process of used welding tube machines, the leveling machine (also called straightener or flattening machine) serves as a critical component that significantly impacts final product quality. This article examines in detail the functions, working principles, and importance of leveling machines in used welding tube machines, providing valuable insights for operators and purchasers of second-hand equipment.
1. Primary Functions of Leveling Machines
(1) Material Flattening
Eliminates coil set (longitudinal curvature) from steel strips
Removes crossbow (transverse curvature) in the material
Corrects edge wave and center buckle defects
(2) Surface Preparation
Removes minor surface imperfections
Creates optimal surface condition for welding
Reduces mill scale and oxidation layers
(3) Tension Control
Provides consistent material tension before forming
Prevents material slippage during processing
Maintains uniform speed through the production line
2. Working Principle
(1) Mechanical Structure
In used welding tube machines, typical levelers consist of:
5-9 precision-ground work rolls
Heavy-duty frame construction
Adjustable roll gap mechanisms
Drive motor and gear reduction system
(2) Operational Process
Coiled strip enters the leveler
Multiple bending cycles through alternating rolls
3- Progressive flattening through each roll station
Precisely straightened material exits to forming section
3. Importance in Tube Production
(1) Weld Quality Improvement
Ensures perfect edge alignment for welding
Eliminates gaps that cause weak welds
Reduces weld flash and spatter
(2) Dimensional Accuracy
Maintains consistent strip width
Prevents tube ovality issues
Ensures uniform wall thickness
(3) Equipment Protection
Reduces forming roll wear
Prevents excessive load on welder
Extends overall machine life
4. Key Components in Used Machines
When evaluating levelers in used welding tube machines, inspect:
(1) Roll Condition
Surface finish and diameter uniformity
Bearing condition and lubrication
Roll alignment and parallelism
(2) Adjustment Mechanisms
Roll gap adjustment functionality
Pressure application systems
Quick-change features for different materials
(3) Drive Systems
Motor power and condition
Gearbox operation and noise levels
Speed synchronization with main line
5. Maintenance Considerations
For levelers in used welding tube machines:
(1) Regular Maintenance
Daily roll cleaning
Weekly bearing lubrication
Monthly alignment checks
(2) Common Issues
Roll surface scoring
Bearing failures
Hydraulic system leaks
Drive chain/belt wear
(3) Upgrade Options
Adding roll polishing systems
Installing automatic gauge control
Upgrading to servo-driven adjustment
6. Material Compatibility
Levelers in used welding tube machines handle:
(1) Material Types
Cold rolled steel
Hot rolled steel
Galvanized steel
Stainless steel (with proper roll finish)
(2) Thickness Range
Typically 0.5mm to 6.0mm
Special heavy-duty models up to 12mm
(3) Width Capacity
Standard models: 150mm to 600mm
Wide models: up to 1500mm
7. Process Integration
(1) Positioning in Production Line
After uncoiler and before forming section
Often combined with edge trimming
Sometimes integrated with cleaning systems
(2) Synchronization Requirements
Speed matching with main line
Tension coordination with accumulator
Feed rate optimization
8. Cost-Benefit Analysis
For used welding tube machines:
(1) Value Contribution
Improves product quality by 30-40%
Reduces scrap rate by 15-25%
Increases production speed potential
(2) Operational Costs
Energy consumption 5-15kW typical
Spare parts availability
Labor requirements
(3) Return on Investment
Payback period typically 6-18 months
Quality improvements justify cost
Essential for precision tube production
Conclusion
The leveling machine in used welding tube machines plays a fundamental role in ensuring product quality, process stability, and equipment longevity. When purchasing or operating second-hand equipment, special attention should be paid to the condition and capabilities of the leveling system. Proper maintenance and potential upgrades of this component can significantly enhance the performance and value of used welding tube machines, making it a critical focus area for tube producers looking to optimize their operations.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-05-16
Introduction
In used welding tube machines, loopers (accumulators) play a critical role in maintaining continuous production by compensating for speed variations between uncoiling and forming processes. Understanding the differences between vertical and horizontal loopers is essential when evaluating or operating used welding tube machines. This article provides a detailed comparison of these two systems, focusing on their structural differences, operational characteristics, and suitability for various production environments.
1. Structural Design Differences
(1) Vertical Loopers
Vertical loopers in used welding tube machines feature:
Upward/Downward Material Path: Strip material moves vertically through the accumulator
Tower-Type Construction: Requires significant vertical space (typically 6-12 meters height)
Guided Roller System: Multiple rollers guide the strip through the vertical loop
Counterweight or Hydraulic Balancing: Maintains consistent tension
(2) Horizontal Loopers
Horizontal loopers in used welding tube machines are characterized by:
Side-to-Side Material Flow: Strip travels horizontally in a looped path
Compact Footprint: Requires more floor space but less height (typically 2-4 meters)
Carriage-Type Design: Moving carriage with rollers creates the accumulation loop
Motorized or Pneumatic Control: Adjusts loop position automatically
2. Operational Performance Comparison
(1) Space Requirements
Vertical Loopers: Ideal for facilities with high ceilings but limited floor space
Horizontal Loopers: Better suited for low-ceiling workshops with available floor area
(2) Material Handling
Vertical Loopers:
Better for thin, delicate materials prone to scratching
Reduced risk of material twisting
Gravity assists in maintaining tension
Horizontal Loopers:
Easier to thread during setup
Better for heavier gauge materials
Simpler visual monitoring of loop position
(3) Speed and Capacity
Vertical Loopers:
Typically allow higher line speeds (up to 120 m/min)
Larger accumulation capacity (longer loops possible)
Horizontal Loopers:
Generally limited to 60-80 m/min
Smaller maximum loop size due to space constraints
3. Maintenance Considerations for Used Equipment
When evaluating used welding tube machines, consider these maintenance factors:
(1) Vertical Looper Maintenance
More complex roller replacement (high elevation work)
Frequent inspection of counterweight cables/chains
Potential for material buildup in vertical guides
Requires specialized lifts for servicing
(2) Horizontal Looper Maintenance
Easier access to all components
More wear on carriage tracks and wheels
Simpler lubrication points
Reduced safety risks during maintenance
4. Application Suitability
(1) Best Uses for Vertical Loopers
High-speed production lines
Thin gauge materials (0.5-2.0 mm)
Facilities with height availability
Precision tube manufacturing
(2) Best Uses for Horizontal Loopers
Heavy gauge material processing
Low-to-medium speed operations
Space-constrained facilities
Entry-level or mid-range used welding tube machines
5. Cost Implications for Used Machines
(1) Vertical Looper Systems
Higher initial cost in used welding tube machines
Potentially greater maintenance expenses
May require facility modifications (height)
Longer service life if properly maintained
(2) Horizontal Looper Systems
More affordable in used welding tube machines
Lower installation costs
Easier to relocate
Generally simpler to repair
6. Conversion and Retrofitting Options
Many used welding tube machines can be modified:
(1) Vertical to Horizontal Conversions
Possible but requires significant structural changes
May need new control systems
Worth considering for space-constrained buyers
(2) Horizontal to Vertical Upgrades
Rarely practical
Usually requires complete looper replacement
Seldom cost-effective for used equipment
7. Purchasing Considerations
When selecting a used welding tube machine:
(1) Choose Vertical Loopers When:
Producing high volumes of thin-walled tubes
Operating in a tall facility
Needing maximum production speed
Processing delicate surface materials
(2) Choose Horizontal Loopers When:
Working with limited ceiling height
Handling thicker materials
Operating at moderate speeds
Seeking easier maintenance access
Conclusion
The choice between vertical and horizontal loopers in used welding tube machines depends on production requirements, facility constraints, and material characteristics. Vertical systems offer speed and capacity advantages for certain applications, while horizontal models provide space efficiency and easier maintenance. When evaluating used welding tube machines, carefully consider which looper type best matches your operational needs and facility conditions to ensure optimal performance and cost-effectiveness.
For more information, please pay attention to the website of Jinyujie Mecha
Introduction
In used welding tube machines, loopers (accumulators) play a critical role in maintaining continuous production by compensating for speed variations between uncoiling and forming processes. Understanding the differences between vertical and horizontal loopers is essential when evaluating or operating used welding tube machines. This article provides a detailed comparison of these two systems, focusing on their structural differences, operational characteristics, and suitability for various production environments.
1. Structural Design Differences
(1) Vertical Loopers
Vertical loopers in used welding tube machines feature:
Upward/Downward Material Path: Strip material moves vertically through the accumulator
Tower-Type Construction: Requires significant vertical space (typically 6-12 meters height)
Guided Roller System: Multiple rollers guide the strip through the vertical loop
Counterweight or Hydraulic Balancing: Maintains consistent tension
(2) Horizontal Loopers
Horizontal loopers in used welding tube machines are characterized by:
Side-to-Side Material Flow: Strip travels horizontally in a looped path
Compact Footprint: Requires more floor space but less height (typically 2-4 meters)
Carriage-Type Design: Moving carriage with rollers creates the accumulation loop
Motorized or Pneumatic Control: Adjusts loop position automatically
2. Operational Performance Comparison
(1) Space Requirements
Vertical Loopers: Ideal for facilities with high ceilings but limited floor space
Horizontal Loopers: Better suited for low-ceiling workshops with available floor area
(2) Material Handling
Vertical Loopers:
Better for thin, delicate materials prone to scratching
Reduced risk of material twisting
Gravity assists in maintaining tension
Horizontal Loopers:
Easier to thread during setup
Better for heavier gauge materials
Simpler visual monitoring of loop position
(3) Speed and Capacity
Vertical Loopers:
Typically allow higher line speeds (up to 120 m/min)
Larger accumulation capacity (longer loops possible)
Horizontal Loopers:
Generally limited to 60-80 m/min
Smaller maximum loop size due to space constraints
3. Maintenance Considerations for Used Equipment
When evaluating used welding tube machines, consider these maintenance factors:
(1) Vertical Looper Maintenance
More complex roller replacement (high elevation work)
Frequent inspection of counterweight cables/chains
Potential for material buildup in vertical guides
Requires specialized lifts for servicing
(2) Horizontal Looper Maintenance
Easier access to all components
More wear on carriage tracks and wheels
Simpler lubrication points
Reduced safety risks during maintenance
4. Application Suitability
(1) Best Uses for Vertical Loopers
High-speed production lines
Thin gauge materials (0.5-2.0 mm)
Facilities with height availability
Precision tube manufacturing
(2) Best Uses for Horizontal Loopers
Heavy gauge material processing
Low-to-medium speed operations
Space-constrained facilities
Entry-level or mid-range used welding tube machines
5. Cost Implications for Used Machines
(1) Vertical Looper Systems
Higher initial cost in used welding tube machines
Potentially greater maintenance expenses
May require facility modifications (height)
Longer service life if properly maintained
(2) Horizontal Looper Systems
More affordable in used welding tube machines
Lower installation costs
Easier to relocate
Generally simpler to repair
6. Conversion and Retrofitting Options
Many used welding tube machines can be modified:
(1) Vertical to Horizontal Conversions
Possible but requires significant structural changes
May need new control systems
Worth considering for space-constrained buyers
(2) Horizontal to Vertical Upgrades
Rarely practical
Usually requires complete looper replacement
Seldom cost-effective for used equipment
7. Purchasing Considerations
When selecting a used welding tube machine:
(1) Choose Vertical Loopers When:
Producing high volumes of thin-walled tubes
Operating in a tall facility
Needing maximum production speed
Processing delicate surface materials
(2) Choose Horizontal Loopers When:
Working with limited ceiling height
Handling thicker materials
Operating at moderate speeds
Seeking easier maintenance access
Conclusion
The choice between vertical and horizontal loopers in used welding tube machines depends on production requirements, facility constraints, and material characteristics. Vertical systems offer speed and capacity advantages for certain applications, while horizontal models provide space efficiency and easier maintenance. When evaluating used welding tube machines, carefully consider which looper type best matches your operational needs and facility conditions to ensure optimal performance and cost-effectiveness.
For more information, please pay attention to the website of Jinyujie Mecha

Time of issue : 2025-05-15
Purchasing a used welding tube machine can be a cost-effective solution for manufacturers, but thorough evaluation is crucial to ensure reliability and performance. This guide provides a comprehensive approach to assessing the condition of used welding tube machines, helping buyers make informed decisions.
1. Visual Inspection
The first step in evaluating a used welding tube machine is a detailed visual examination:
(1) Structural Integrity
Check for cracks, dents, or deformations in the machine frame
Inspect welding seams for signs of repair or fatigue
Examine guide rails and rollers for excessive wear
(2) Surface Condition
Look for rust or corrosion, especially in critical components
Check paint condition as an indicator of maintenance history
Inspect hydraulic systems for leaks or oil stains
(3) Electrical Components
Examine wiring insulation for damage or brittleness
Check control panels for burn marks or loose connections
Verify condition of switches and emergency stop buttons
2. Mechanical Assessment
A thorough mechanical evaluation helps determine the operational condition:
(1) Drive System
Test motor performance under load
Check gearboxes for unusual noises or vibrations
Inspect chain/belt drives for wear and proper tension
(2) Rolling System
Measure roller diameters for wear patterns
Check bearing conditions and lubrication
Verify alignment of forming stands
(3) Welding Head
Examine electrode condition and alignment
Check pressure mechanisms for consistency
Inspect cooling systems for proper function
3. Functional Testing
Operational tests provide the most accurate assessment:
(1) Production Trial
Run sample material through the complete process
Measure weld quality and consistency
Check dimensional accuracy of produced tubes
(2) Speed and Performance
Test machine at various production speeds
Monitor for vibrations or unusual noises
Check acceleration and deceleration smoothness
(3) Control Systems
Verify PLC/HMI functionality
Test all programmable settings
Check safety interlocks and alarms
4. Documentation Review
Proper documentation provides valuable insights:
(1) Maintenance Records
Review service history and frequency
Check for major repairs or component replacements
Verify lubrication schedules
(2) Production History
Examine total operating hours
Check typical production loads
Review any downtime records
(3) Technical Specifications
Compare current condition to original specs
Verify any modifications made
Check for available spare parts
5. Specialized Inspection Methods
Advanced evaluation techniques provide deeper insights:
(1) Non-Destructive Testing (NDT)
Ultrasonic testing for internal cracks
Magnetic particle inspection for surface defects
Dye penetrant examination of critical welds
(2) Vibration Analysis
Detect bearing and gear wear patterns
Identify imbalance issues
Predict potential failures
(3) Thermal Imaging
Locate electrical hot spots
Identify friction points
Check cooling system efficiency
6. Key Evaluation Criteria
When assessing a used welding tube machine, focus on these critical factors:
(1) Wear Indicators
Roller groove depth
Guide shoe thickness
Drive chain stretch
(2) Performance Metrics
Weld speed consistency
Energy consumption
Product dimensional tolerance
(3) Economic Considerations
Estimated remaining service life
Availability of spare parts
Potential upgrade costs
7. Professional Inspection Services
For comprehensive evaluation:
(1) Third-Party Inspectors
Independent assessment
Specialized testing equipment
Detailed reporting
(2) Manufacturer Evaluation
OEM technical support
Genuine part verification
Factory reconditioning options
(3) Certification Programs
Verified machine condition
Performance guarantees
Warranty options
Conclusion
Evaluating a used welding tube machine requires systematic inspection across multiple parameters. By combining visual checks, mechanical assessment, functional testing, and documentation review, buyers can accurately determine the machine's condition and value. Investing time in thorough evaluation helps avoid costly surprises and ensures the used welding tube machine will meet production requirements effectively.
For high-value purchases, professional inspection services provide additional assurance and help negotiate fair pricing based on actual machine condition.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
Purchasing a used welding tube machine can be a cost-effective solution for manufacturers, but thorough evaluation is crucial to ensure reliability and performance. This guide provides a comprehensive approach to assessing the condition of used welding tube machines, helping buyers make informed decisions.
1. Visual Inspection
The first step in evaluating a used welding tube machine is a detailed visual examination:
(1) Structural Integrity
Check for cracks, dents, or deformations in the machine frame
Inspect welding seams for signs of repair or fatigue
Examine guide rails and rollers for excessive wear
(2) Surface Condition
Look for rust or corrosion, especially in critical components
Check paint condition as an indicator of maintenance history
Inspect hydraulic systems for leaks or oil stains
(3) Electrical Components
Examine wiring insulation for damage or brittleness
Check control panels for burn marks or loose connections
Verify condition of switches and emergency stop buttons
2. Mechanical Assessment
A thorough mechanical evaluation helps determine the operational condition:
(1) Drive System
Test motor performance under load
Check gearboxes for unusual noises or vibrations
Inspect chain/belt drives for wear and proper tension
(2) Rolling System
Measure roller diameters for wear patterns
Check bearing conditions and lubrication
Verify alignment of forming stands
(3) Welding Head
Examine electrode condition and alignment
Check pressure mechanisms for consistency
Inspect cooling systems for proper function
3. Functional Testing
Operational tests provide the most accurate assessment:
(1) Production Trial
Run sample material through the complete process
Measure weld quality and consistency
Check dimensional accuracy of produced tubes
(2) Speed and Performance
Test machine at various production speeds
Monitor for vibrations or unusual noises
Check acceleration and deceleration smoothness
(3) Control Systems
Verify PLC/HMI functionality
Test all programmable settings
Check safety interlocks and alarms
4. Documentation Review
Proper documentation provides valuable insights:
(1) Maintenance Records
Review service history and frequency
Check for major repairs or component replacements
Verify lubrication schedules
(2) Production History
Examine total operating hours
Check typical production loads
Review any downtime records
(3) Technical Specifications
Compare current condition to original specs
Verify any modifications made
Check for available spare parts
5. Specialized Inspection Methods
Advanced evaluation techniques provide deeper insights:
(1) Non-Destructive Testing (NDT)
Ultrasonic testing for internal cracks
Magnetic particle inspection for surface defects
Dye penetrant examination of critical welds
(2) Vibration Analysis
Detect bearing and gear wear patterns
Identify imbalance issues
Predict potential failures
(3) Thermal Imaging
Locate electrical hot spots
Identify friction points
Check cooling system efficiency
6. Key Evaluation Criteria
When assessing a used welding tube machine, focus on these critical factors:
(1) Wear Indicators
Roller groove depth
Guide shoe thickness
Drive chain stretch
(2) Performance Metrics
Weld speed consistency
Energy consumption
Product dimensional tolerance
(3) Economic Considerations
Estimated remaining service life
Availability of spare parts
Potential upgrade costs
7. Professional Inspection Services
For comprehensive evaluation:
(1) Third-Party Inspectors
Independent assessment
Specialized testing equipment
Detailed reporting
(2) Manufacturer Evaluation
OEM technical support
Genuine part verification
Factory reconditioning options
(3) Certification Programs
Verified machine condition
Performance guarantees
Warranty options
Conclusion
Evaluating a used welding tube machine requires systematic inspection across multiple parameters. By combining visual checks, mechanical assessment, functional testing, and documentation review, buyers can accurately determine the machine's condition and value. Investing time in thorough evaluation helps avoid costly surprises and ensures the used welding tube machine will meet production requirements effectively.
For high-value purchases, professional inspection services provide additional assurance and help negotiate fair pricing based on actual machine condition.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-05-14
The global market for used welding tube machines has shown significant growth in recent years, driven by cost efficiency, industrial demand, and the increasing adoption of refurbished manufacturing equipment. This analysis explores the current market trends, key drivers, challenges, and future prospects for used welding tube machines, providing insights for manufacturers, traders, and investors.
1. Market Overview
The used welding tube machine market is a vital segment of the metal fabrication industry, catering to small and medium-sized enterprises (SMEs) seeking affordable production solutions. These machines are widely used in construction, automotive, oil & gas, and manufacturing sectors for producing pipes and tubes of various specifications.
Key Market Trends:
Rising Demand for Cost-Effective Solutions: With new welding tube machines requiring substantial capital investment, many manufacturers opt for used welding tube machines to reduce costs while maintaining production efficiency.
Increased Refurbishment and Resale: Companies specializing in refurbishing industrial machinery have expanded, offering upgraded used welding tube machines with improved performance and extended lifespans4.
Growth in Emerging Markets: Developing economies in Asia, Africa, and Latin America are increasingly sourcing used welding tube machines due to lower budgets and growing industrialization.
2. Market Drivers
Several factors contribute to the growing demand for used welding tube machines:
(1) Economic Advantages
Lower Initial Investment: A new high-frequency welding tube machine can cost between 100,000and100,000and500,000, whereas a used welding tube machine with similar capabilities may be available for 30-60% less4.
Reduced Depreciation Losses: Unlike new equipment, used welding tube machines have already undergone significant depreciation, making them financially viable for startups and small workshops.
(2) Sustainability and Circular Economy
Many industries are adopting sustainable practices by reusing machinery instead of purchasing new equipment, reducing electronic waste and carbon footprints.
Refurbished used welding tube machines often include modernized components, making them nearly as efficient as new models.
(3) Flexibility in Production
Used welding tube machines are available in various models (HF welding, TIG welding, ERW tube mills), allowing businesses to select machines tailored to their production needs3.
Some suppliers offer customization options, retrofitting older machines with automation features to enhance productivity.
3. Market Challenges
Despite the advantages, the used welding tube machine market faces several obstacles:
(1) Quality and Reliability Concerns
Older machines may have hidden defects, requiring additional maintenance costs.
Buyers must carefully inspect used welding tube machines for wear and tear, especially in critical components like rollers, welding heads, and electrical systems.
(2) Limited Availability of Spare Parts
Some older models may no longer have readily available replacement parts, forcing buyers to rely on aftermarket solutions or machine modifications.
(3) Competition from New Technologies
Advances in automation and Industry 4.0 are pushing manufacturers toward smart welding solutions, making some used welding tube machines less attractive for high-precision applications.
4. Regional Market Insights
(1) Asia-Pacific (China, India, Southeast Asia)
The largest market for used welding tube machines, driven by rapid industrialization and infrastructure development.
China remains a major supplier, with many manufacturers upgrading to newer models and selling older machines domestically and internationally.
(2) North America & Europe
Mature markets with steady demand for refurbished industrial equipment.
Strict environmental regulations encourage the reuse of machinery, supporting the used welding tube machine market.
(3) Africa & Latin America
Growing demand due to expanding construction and oil & gas sectors.
Limited access to new machinery makes used welding tube machines a preferred choice.
5. Future Outlook
The used welding tube machine market is expected to grow steadily, supported by:
Increasing adoption of automation upgrades (retrofitting older machines with IoT and CNC controls).
Expansion of metal fabrication industries in emerging economies.
Rising focus on sustainability, promoting the reuse of industrial equipment.
However, buyers must remain cautious, ensuring proper inspection and maintenance of used welding tube machines to maximize their operational lifespan.
Conclusion
The used welding tube machine market offers a cost-effective and sustainable alternative for manufacturers worldwide. While challenges such as maintenance and part availability persist, the economic benefits and flexibility of these machines make them a viable option for businesses looking to optimize production c
The global market for used welding tube machines has shown significant growth in recent years, driven by cost efficiency, industrial demand, and the increasing adoption of refurbished manufacturing equipment. This analysis explores the current market trends, key drivers, challenges, and future prospects for used welding tube machines, providing insights for manufacturers, traders, and investors.
1. Market Overview
The used welding tube machine market is a vital segment of the metal fabrication industry, catering to small and medium-sized enterprises (SMEs) seeking affordable production solutions. These machines are widely used in construction, automotive, oil & gas, and manufacturing sectors for producing pipes and tubes of various specifications.
Key Market Trends:
Rising Demand for Cost-Effective Solutions: With new welding tube machines requiring substantial capital investment, many manufacturers opt for used welding tube machines to reduce costs while maintaining production efficiency.
Increased Refurbishment and Resale: Companies specializing in refurbishing industrial machinery have expanded, offering upgraded used welding tube machines with improved performance and extended lifespans4.
Growth in Emerging Markets: Developing economies in Asia, Africa, and Latin America are increasingly sourcing used welding tube machines due to lower budgets and growing industrialization.
2. Market Drivers
Several factors contribute to the growing demand for used welding tube machines:
(1) Economic Advantages
Lower Initial Investment: A new high-frequency welding tube machine can cost between 100,000and100,000and500,000, whereas a used welding tube machine with similar capabilities may be available for 30-60% less4.
Reduced Depreciation Losses: Unlike new equipment, used welding tube machines have already undergone significant depreciation, making them financially viable for startups and small workshops.
(2) Sustainability and Circular Economy
Many industries are adopting sustainable practices by reusing machinery instead of purchasing new equipment, reducing electronic waste and carbon footprints.
Refurbished used welding tube machines often include modernized components, making them nearly as efficient as new models.
(3) Flexibility in Production
Used welding tube machines are available in various models (HF welding, TIG welding, ERW tube mills), allowing businesses to select machines tailored to their production needs3.
Some suppliers offer customization options, retrofitting older machines with automation features to enhance productivity.
3. Market Challenges
Despite the advantages, the used welding tube machine market faces several obstacles:
(1) Quality and Reliability Concerns
Older machines may have hidden defects, requiring additional maintenance costs.
Buyers must carefully inspect used welding tube machines for wear and tear, especially in critical components like rollers, welding heads, and electrical systems.
(2) Limited Availability of Spare Parts
Some older models may no longer have readily available replacement parts, forcing buyers to rely on aftermarket solutions or machine modifications.
(3) Competition from New Technologies
Advances in automation and Industry 4.0 are pushing manufacturers toward smart welding solutions, making some used welding tube machines less attractive for high-precision applications.
4. Regional Market Insights
(1) Asia-Pacific (China, India, Southeast Asia)
The largest market for used welding tube machines, driven by rapid industrialization and infrastructure development.
China remains a major supplier, with many manufacturers upgrading to newer models and selling older machines domestically and internationally.
(2) North America & Europe
Mature markets with steady demand for refurbished industrial equipment.
Strict environmental regulations encourage the reuse of machinery, supporting the used welding tube machine market.
(3) Africa & Latin America
Growing demand due to expanding construction and oil & gas sectors.
Limited access to new machinery makes used welding tube machines a preferred choice.
5. Future Outlook
The used welding tube machine market is expected to grow steadily, supported by:
Increasing adoption of automation upgrades (retrofitting older machines with IoT and CNC controls).
Expansion of metal fabrication industries in emerging economies.
Rising focus on sustainability, promoting the reuse of industrial equipment.
However, buyers must remain cautious, ensuring proper inspection and maintenance of used welding tube machines to maximize their operational lifespan.
Conclusion
The used welding tube machine market offers a cost-effective and sustainable alternative for manufacturers worldwide. While challenges such as maintenance and part availability persist, the economic benefits and flexibility of these machines make them a viable option for businesses looking to optimize production c
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Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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