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Form of metal streamlines for pipes made by high frequency welded pipe equipment

Form of metal streamlines for pipes made by high frequency welded pipe equipment

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  • Release time:2022-07-25 11:30
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【概要描述】The metal streamline is the most important display feature of the various forms of the weld. When the high-frequency welded pipe equipment is used to make pipes, the partially melted or semi-melted metal under certain high temperature conditions is formed under the action of pressure.

Form of metal streamlines for pipes made by high frequency welded pipe equipment

【概要描述】The metal streamline is the most important display feature of the various forms of the weld. When the high-frequency welded pipe equipment is used to make pipes, the partially melted or semi-melted metal under certain high temperature conditions is formed under the action of pressure.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-07-25 11:30
  • Pvs:
Detail

The metal streamline is the most important display feature of the various forms of the weld. When the high frequency welded pipe equipment is used to make pipes, the partially melted or semi-melted metal under certain high temperature conditions is formed under the action of pressure. The crystal structure of special shape is also a comprehensive reflection of the magnitude and direction of welding extrusion force, line energy and welding speed, and has fixed metallurgical properties.

 

High frequency welded pipe equipment

 

In order to use metal streamlines to correctly control the welding process specification, first of all, it is necessary to fully understand the various performance characteristics of metal streamlines and accurately analyze and judge the causes of various shapes, so as to play their role in the production of high-frequency welded pipes by high frequency welded pipe equipment. proper role. The commonly used bad forms of metal streamlines are roughly as follows.

 

①The rising angle of the streamline is too large

Usually, the larger the rising angle of the metal streamline, the larger the extrusion force during welding. Larger extrusion force can squeeze out more molten metal, so that the metal on the edge of the plate is not welded well, and it is easy to produce "cold welding". This is a common welding defect, which generally occurs in the following two situations in production:

 

(1) The unwelded edge of the plate can occur on the inside of the weld or on the outside. When the inner side is not welded, the fracture is generally smooth and tidy, mostly gray, accounting for a large proportion of the weld area, and the rising angle of the streamline can sometimes reach 80°~90°; when the outer side is not welded. When the current density is too small, it is easy to cause low temperature welding, and the weld fusion is not good. In most cases, the rising angle of the streamline is smaller and the display is not very clear. In severe cases, the streamline cannot be seen clearly.

 

(2) The unwelded edge of the plate may also occur in the middle of the weld. This kind of defect is actually a kind of "virtual welding", the fusion line in the middle of the weld is generally slight, and sometimes it is even difficult to distinguish, and only the "waist drum" of thermal influence can be observed. The microstructure of the unwelded part is mostly "oxide inclusions" or "grey spots", with fine ferrite + pearlite on both sides. Welds with such defects are very easy to crack when subjected to a 90° flattening test.

 

In addition to being closely related to the welding line energy and extrusion force, the above-mentioned plate edge unwelded defects are also related to the parallelism of the plate edge during forming. The normal plate edge can ensure parallel welding, the weld gap tends to be consistent, and the penetration depth is also good; when heating and uniform extrusion along the wall thickness direction, the weld seam welding can achieve the best state, and the streamline distribution can also be formed symmetrically ; The closer the centerline of the streamline and the centerline of the coil wall thickness are, the more basic the welding quality can be, and the "oxide inclusions" or "grey spots" in the center of the weld can be completely and evenly extruded.

 

High frequency welded pipe equipment

 

②The rising angle of the streamline is too small.

When the line energy and welding speed remain relatively stable, if the extrusion force is too small, it is easy to cause the rising angle of the metal streamline to be small, and the streamline display is often unclear, sometimes even invisible. In this case, the fusion line in the middle of the weld is often accompanied by more "oxide inclusions", which become the crack source of weld cracking, which is a common defect affecting the quality of the welded pipe. 

 

③The rising angle of the streamline is asymmetrical

This weld defect is mainly caused by the following three reasons:

(1) The extrusion force is unbalanced. When adjusting the squeezing rollers, the distribution of the squeezing force of the top roller or the rollers on both sides is asymmetrical, which is easy to cause different changes in the shape of the streamline. Some rising angles are too small, the streamlines are subtle or unclear; It is too large, the streamline is very thick, the display is abnormal, and it presents various forms. If the edge of the plate is not parallel, it is easy to produce misalignment on the weld, resulting in unidirectional loss of weld metal and stress concentration, and the probability of defects in the weld will also increase. Special attention must be paid when adjusting the roll.

 

(2) The parallelism of the board edge is not good. The edges of the board are not parallel, and "∨" and "∧" shapes are easy to appear. Since high-frequency welding is the result of the proximity effect and the skin effect of the board edges, if the board edges are not parallel, the high-frequency current distribution will be uneven, the local temperature difference will be significant, and the board edges will not be in synchronous contact to achieve tight welding.

 

When the edge of the board is "∨" shape. The inner edge of the weld should be in contact before the outer edge, so the current density of the inner edge is higher, and the heating temperature is higher than that of the outer edge. Therefore, under the condition of the same extrusion force, the rising angle of the metal streamline of the inner wall that contacts first is larger, while the rising angle of the metal streamline of the outer wall is significantly smaller, and even no streamline is displayed in severe cases.

 

When the edge of the plate is "∧" shape, the outer wall of the welded pipe is in contact with each other before the inner wall, so the proximity effect of the outer wall is stronger than that of the inner wall, the current density is higher, and the welding temperature is higher. The outer burr is thicker than the inner burr, and the rising angle of the metal streamline is obviously larger than that of the inner wall of the welded pipe.

 

(3) The parallelism of the board edge is unreasonable. This may bend the edge of the rolled plate, easily causing the edge to be "wavy", increasing the tendency to form "grey spots"; at the same time, there may be "displacement" at the welding seam during forming and continue to the welding point. where the solidifying weld metal will be "biased" or cracked.

 

High frequency welded pipe equipment

 

④The center distance is too large

The center distance is the distance between the center line of the metal streamline and the center line of the wall thickness of the coiled plate. In addition to being related to the smoothness of the extrusion force, the parallelism of the plate edge also has a great influence on it.

 

(1) When the extrusion force is not adjusted properly, the center line of the metal streamline may be down if it is not up, and it is difficult to match the center line of the coil wall thickness. The larger the center distance is, the more uneven the distance between the butt joints is, and the "wrong side" is easy to occur at the weld, the "oxide inclusions" are difficult to extrude, and the welding quality is also worse; when the center distance is close to zero. The welding point can be close to the center of the extrusion roller, the extrusion force distribution is more uniform, and the welding quality can reach the best state.

 

(2) When the sides of the coil are not parallel, it is easy to cause the center distance to be too large. It is difficult to achieve parallel joints, the thermal effect of local solder joints may be reduced, a low-temperature welding state occurs, oxides in the welds are difficult to remove, and the tendency to form "grey spots" increases. When the center distance reaches 1/2 of the coil wall thickness, The weld metal is easy to be discharged in one direction, and the opposite side is easy to form "grey spots", or local poor welding.

 

High frequency welded pipe equipment

 

In addition to the above four kinds of bad forms, when the extrusion force is constant, if the welding line energy and welding speed are too large, the metal cooling speed is quite fast, and the structure of the weld and heat-affected zone is mostly coarse iron wire and block. Flake pearlite, the needle-like Widmandelweiss structure remaining in the structure, is difficult to eliminate in the post-weld tempering heat treatment (600-650 ℃), and the fusion line and flow line of the weld often show poor shape. It is easy to produce large stress concentration at the welding seam, which is enough to cause the "bow" bending deformation of the welded pipe, and even lead to the cracking of the welding seam.

 

Summary: The common bad forms of metal streamlines in high-frequency welded pipes when making pipes with high frequency welded pipe equipment are roughly as follows: ① The rising angle of the streamlines is too large. ②The rising angle of the streamline is too small. ③ The rising angle of the streamline is asymmetrical. ④The center distance is too large.

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A thorough evaluation before purchasing a used pipe welding machine
A thorough evaluation before purchasing a used pipe welding machine
Before purchasing a second-hand pipe welding machine, it is necessary to conduct a comprehensive evaluation to ensure the performance, cost performance and suitability of the equipment. Here are the key assessment steps:

1.Equipment condition check
Appearance inspection: Check whether the equipment has obvious damage, rust or deformation.
Core component inspection: Focus on inspecting key components such as welding joints, transmission systems, and electrical systems to ensure that there is no serious wear or failure.
Operation test: Conduct trial operation to observe whether the equipment runs smoothly and whether the welding quality meets the requirements.

2.Equipment history
Service life: Understand the use time of the equipment, usually the longer the service life, the higher the risk of failure.
Maintenance records: Check the maintenance and repair records of the equipment to determine whether it is well maintained.
Working environment: Understand the working environment before the equipment, harsh environment may lead to increased equipment wear.

3.Technical parameters
Production capacity: Confirm whether the production capacity of the equipment meets the demand, including welding speed, pipe diameter range, etc.
Accuracy requirements: Check the welding accuracy of the equipment to ensure that it meets the production standard.
Compatibility: Confirm whether the equipment can be adapted to existing production lines or raw materials.

4.Brand and model
Brand reputation: Choose a well-known brand, usually the quality and after-sales service is more guaranteed.
Model suitability: Ensure that the model is suitable for current production needs and avoid insufficient or excessive functions.

5.Price evaluation
Market conditions: Understand the market price of the same type of equipment, to avoid too high or too low prices.
Cost performance: Considering the equipment condition, performance and price, choose cost-effective equipment.

6.After-sales service
Warranty Period: Confirm whether the equipment is under warranty, or whether the warranty can be extended.
Technical Support: Find out if the supplier provides technical support or repair services.
Accessories supply: Confirm that equipment accessories are easy to obtain to avoid the risk of stopping production.

7.Legal and Compliance
Equipment legitimacy: Ensure that the source of equipment is legitimate, avoid buying stolen goods or illegal equipment.
Compliance: Verify that the equipment meets local safety standards and environmental requirements.

8.Supplier reputation
Supplier background: Choose suppliers with good reputation to reduce the risk of purchase.
User Reviews: View other users' reviews of suppliers to understand their service quality and equipment condition.

9.Transportation and installation
Transportation costs: Consider the transportation costs of equipment, especially large equipment.
Installation and commissioning: Confirm whether the supplier provides installation and commissioning services to ensure the normal use of the equipment.

10.Contract Terms
Clear terms: Ensure that key information such as equipment condition, price, warranty period, etc. is clear in the contract.
Return Policy: Understand the return policy to avoid the inability to return if the equipment does not meet the requirements.

Summary
The purchase of second-hand pipe welding machine needs to consider the equipment status, history, technical parameters, price, after-sales service and other factors to ensure that the equipment meets the production demand and is cost-effective.

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 
Detail
Before purchasing a second-hand pipe welding machine, it is necessary to conduct a comprehensive evaluation to ensure the performance, cost performance and suitability of the equipment. Here are the key assessment steps:

1.Equipment condition check
Appearance inspection: Check whether the equipment has obvious damage, rust or deformation.
Core component inspection: Focus on inspecting key components such as welding joints, transmission systems, and electrical systems to ensure that there is no serious wear or failure.
Operation test: Conduct trial operation to observe whether the equipment runs smoothly and whether the welding quality meets the requirements.

2.Equipment history
Service life: Understand the use time of the equipment, usually the longer the service life, the higher the risk of failure.
Maintenance records: Check the maintenance and repair records of the equipment to determine whether it is well maintained.
Working environment: Understand the working environment before the equipment, harsh environment may lead to increased equipment wear.

3.Technical parameters
Production capacity: Confirm whether the production capacity of the equipment meets the demand, including welding speed, pipe diameter range, etc.
Accuracy requirements: Check the welding accuracy of the equipment to ensure that it meets the production standard.
Compatibility: Confirm whether the equipment can be adapted to existing production lines or raw materials.

4.Brand and model
Brand reputation: Choose a well-known brand, usually the quality and after-sales service is more guaranteed.
Model suitability: Ensure that the model is suitable for current production needs and avoid insufficient or excessive functions.

5.Price evaluation
Market conditions: Understand the market price of the same type of equipment, to avoid too high or too low prices.
Cost performance: Considering the equipment condition, performance and price, choose cost-effective equipment.

6.After-sales service
Warranty Period: Confirm whether the equipment is under warranty, or whether the warranty can be extended.
Technical Support: Find out if the supplier provides technical support or repair services.
Accessories supply: Confirm that equipment accessories are easy to obtain to avoid the risk of stopping production.

7.Legal and Compliance
Equipment legitimacy: Ensure that the source of equipment is legitimate, avoid buying stolen goods or illegal equipment.
Compliance: Verify that the equipment meets local safety standards and environmental requirements.

8.Supplier reputation
Supplier background: Choose suppliers with good reputation to reduce the risk of purchase.
User Reviews: View other users' reviews of suppliers to understand their service quality and equipment condition.

9.Transportation and installation
Transportation costs: Consider the transportation costs of equipment, especially large equipment.
Installation and commissioning: Confirm whether the supplier provides installation and commissioning services to ensure the normal use of the equipment.

10.Contract Terms
Clear terms: Ensure that key information such as equipment condition, price, warranty period, etc. is clear in the contract.
Return Policy: Understand the return policy to avoid the inability to return if the equipment does not meet the requirements.

Summary
The purchase of second-hand pipe welding machine needs to consider the equipment status, history, technical parameters, price, after-sales service and other factors to ensure that the equipment meets the production demand and is cost-effective.

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 
The connection between pipe welding mechanism and furniture industry,
The connection between pipe welding mechanism and furniture industry,
There is a close relationship between pipe (steel pipe manufactured by welding process) and the furniture industry, especially in modern furniture design and manufacturing, welded pipe is more and more widely used. The following are the main relationships and specific applications of the two:

1. Material basis: Welded pipe as the skeleton material of furniture
Structural support: Steel pipes made of welded pipes are often used in the frame structure of furniture, such as chair legs, table supports, bed frames, bookshelves, etc. Its high strength and stability can withstand large loads.
Lightweight design: Compared with solid steel, welded pipe is lightweight and low cost, suitable for furniture requiring portability or simple design (such as outdoor folding tables and chairs).

2. Design flexibility
Diversified modeling: Welded pipes can be processed into complex shapes through bending, cutting, welding and other processes to meet the curve or geometric design needs of modern furniture (such as streamlined bar chairs, creative shelves).
Industrial style: The exposed metal welded pipe structure is the iconic element of industrial furniture, often used in cafes, LOFT Spaces and other scenes.

3. Functionality and durability
Outdoor furniture: Galvanized welded pipes or steel pipes treated with anti-rust are often used in outdoor furniture (such as garden tables and chairs, balcony guardrail), with strong weather resistance.
Load-bearing requirements: The high strength characteristics of welded pipes are suitable for the production of storage shelves, shelves and other furniture requiring high load-bearing.

4. Production process coordination
Mass production: The efficient production mode of welded pipe mechanism is matched with the large-scale demand of furniture manufacturing, reducing raw material costs.
Customized processing: Furniture factories can customize welded pipes of different specifications (such as diameter and wall thickness) according to design requirements to improve product adaptability.

5. Environmental Protection and Sustainability
Material recycling: Steel can be recycled, in line with the design concept of environmentally friendly furniture.
Surface treatment: Spraying, painting and other processes can improve the beauty and durability of welded pipe furniture, while reducing the environmental burden.

6. Market trends
Modular furniture: The standardized interface of welded pipe structure is easy to assemble and disassemble, catering to the popular trend of modular furniture.
Cross-border combination: Welded pipes are often combined with wood, glass, plastic and other materials to create a mixed-match style (such as metal + wood dining tables).

Typical Application Case
Office furniture: Steel desk bracket, conference chair frame.
Home Decoration: Metal bookshelf, coat rack, lamp stand.
Public Facilities: Park benches, shopping mall display shelves.

Summary
The welded pipe mechanism provides the furniture industry with an economical, durable and flexible material solution that drives innovation in the function, aesthetics and sustainability of modern furniture. Its combination with furniture is not only an extension of industrial technology, but also an expansion of design language.

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 
Detail
There is a close relationship between pipe (steel pipe manufactured by welding process) and the furniture industry, especially in modern furniture design and manufacturing, welded pipe is more and more widely used. The following are the main relationships and specific applications of the two:

1. Material basis: Welded pipe as the skeleton material of furniture
Structural support: Steel pipes made of welded pipes are often used in the frame structure of furniture, such as chair legs, table supports, bed frames, bookshelves, etc. Its high strength and stability can withstand large loads.
Lightweight design: Compared with solid steel, welded pipe is lightweight and low cost, suitable for furniture requiring portability or simple design (such as outdoor folding tables and chairs).

2. Design flexibility
Diversified modeling: Welded pipes can be processed into complex shapes through bending, cutting, welding and other processes to meet the curve or geometric design needs of modern furniture (such as streamlined bar chairs, creative shelves).
Industrial style: The exposed metal welded pipe structure is the iconic element of industrial furniture, often used in cafes, LOFT Spaces and other scenes.

3. Functionality and durability
Outdoor furniture: Galvanized welded pipes or steel pipes treated with anti-rust are often used in outdoor furniture (such as garden tables and chairs, balcony guardrail), with strong weather resistance.
Load-bearing requirements: The high strength characteristics of welded pipes are suitable for the production of storage shelves, shelves and other furniture requiring high load-bearing.

4. Production process coordination
Mass production: The efficient production mode of welded pipe mechanism is matched with the large-scale demand of furniture manufacturing, reducing raw material costs.
Customized processing: Furniture factories can customize welded pipes of different specifications (such as diameter and wall thickness) according to design requirements to improve product adaptability.

5. Environmental Protection and Sustainability
Material recycling: Steel can be recycled, in line with the design concept of environmentally friendly furniture.
Surface treatment: Spraying, painting and other processes can improve the beauty and durability of welded pipe furniture, while reducing the environmental burden.

6. Market trends
Modular furniture: The standardized interface of welded pipe structure is easy to assemble and disassemble, catering to the popular trend of modular furniture.
Cross-border combination: Welded pipes are often combined with wood, glass, plastic and other materials to create a mixed-match style (such as metal + wood dining tables).

Typical Application Case
Office furniture: Steel desk bracket, conference chair frame.
Home Decoration: Metal bookshelf, coat rack, lamp stand.
Public Facilities: Park benches, shopping mall display shelves.

Summary
The welded pipe mechanism provides the furniture industry with an economical, durable and flexible material solution that drives innovation in the function, aesthetics and sustainability of modern furniture. Its combination with furniture is not only an extension of industrial technology, but also an expansion of design language.

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 
Application of high precision steel pipe produced by pipe welding machine in modern industry
Application of high precision steel pipe produced by pipe welding machine in modern industry
The high-precision steel pipe produced by pipe welding machine is widely used in modern industry, and its production process and quality control requirements are strict. The following is a summary of the relevant technical points and application scenarios:

1. The characteristics of high-precision steel pipe
High dimensional accuracy: small outer diameter, wall thickness tolerance (usually up to ±0.05mm), low ellipticity.
Excellent surface quality: smooth weld without burrs, surface finish Ra≤0.8μm.
Stable mechanical properties: weld strength close to the base material, uniform compressive/tensile properties.
Applicable materials: stainless steel (304/316L), carbon steel, alloy steel (such as API series), etc.

2. Core production process
(1) Type of pipe welding machine
High-frequency welding (HFW) : high efficiency, suitable for medium thin wall pipe (Φ10~Φ600mm), need to cooperate with precision forming unit.
Laser welding: small heat affected zone, narrow weld (0.1~0.3mm), suitable for ultra-thin walls (such as 0.3mm) or special alloys.
TIG welding: For high alloy steel or thick wall pipe, higher weld purity.
(2) Key process links
Forming process: multi-roll continuous cold forming, dynamic adjustment of roll parameters to compensate for rebound.
Welding control:
High frequency welding: precise control of current frequency (100~400kHz) and extrusion amount.
Laser welding: focus position accuracy ±0.05mm, real-time depth monitoring (such as CCD vision).
Online detection:
Eddy current inspection (ET) : Detection of surface cracks.
Ultrasonic inspection (UT) : detection of internal defects (sensitivity Φ0.5mm equivalent flat hole).
Laser caliper: Outer diameter closed loop control (accuracy ±0.01mm).

3. Post-processing technology
Heat treatment: bright annealing (hydrogen nitrogen protection atmosphere) to eliminate stress, hardness fluctuation ≤3HRC.
Straightening: multi-roll precision straightening, straightness ≤0.5mm/m.
Surface treatment:
Electrolytic polishing (EP) : For medical/food grade stainless steel tubes, Ra up to 0.2μm.
Coating: hot dip galvanizing (zinc layer ≥80μm) or electroless nickel plating (uniform thickness ±2μm).

4. Typical application areas
Automobile manufacturing: fuel injection pipe (tolerance ±0.03mm), hydraulic pipe.
Semiconductor equipment: Ultra-high clean gas delivery pipe (inner wall EP treatment, particle ≤Class 5).
Medical instruments: endoscopic catheter (Φ1~5mm, wall thickness 0.1mm).
Energy industry: Instrument tubes for nuclear power plants (SA213-TP347H material, intergranular corrosion test passed).

5. Quality control standards
International standard:
ASTM A269 (Universal Seamless and Welded Austenitic Stainless Steel Pipe)
EN 10305-4 (Precision welded pipes for hydraulic systems)
Industry certification: ISO 9001, PED 2014/68/EU (Pressure Equipment Directive).

6. Technological trends
Intelligent production: AI algorithm optimizes welding parameters, and the yield is increased to more than 99.5%.
Composite process: laser + arc composite welding, both efficiency and quality (speed increased by 30%).
Green manufacturing: low energy high frequency power supply (efficiency ≥90%), waste acid recovery ≥95%.

Through the above process optimization and strict quality control, the high-precision steel pipe produced by the pipe welding machine can meet the demanding requirements of size, performance and reliability in high-end industrial fields. In actual production, the process route needs to be customized according to the material characteristics and uses, for example, medical tubes need to undergo additional passivation treatment and biocompatibility testing.

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 
Detail
The high-precision steel pipe produced by pipe welding machine is widely used in modern industry, and its production process and quality control requirements are strict. The following is a summary of the relevant technical points and application scenarios:

1. The characteristics of high-precision steel pipe
High dimensional accuracy: small outer diameter, wall thickness tolerance (usually up to ±0.05mm), low ellipticity.
Excellent surface quality: smooth weld without burrs, surface finish Ra≤0.8μm.
Stable mechanical properties: weld strength close to the base material, uniform compressive/tensile properties.
Applicable materials: stainless steel (304/316L), carbon steel, alloy steel (such as API series), etc.

2. Core production process
(1) Type of pipe welding machine
High-frequency welding (HFW) : high efficiency, suitable for medium thin wall pipe (Φ10~Φ600mm), need to cooperate with precision forming unit.
Laser welding: small heat affected zone, narrow weld (0.1~0.3mm), suitable for ultra-thin walls (such as 0.3mm) or special alloys.
TIG welding: For high alloy steel or thick wall pipe, higher weld purity.
(2) Key process links
Forming process: multi-roll continuous cold forming, dynamic adjustment of roll parameters to compensate for rebound.
Welding control:
High frequency welding: precise control of current frequency (100~400kHz) and extrusion amount.
Laser welding: focus position accuracy ±0.05mm, real-time depth monitoring (such as CCD vision).
Online detection:
Eddy current inspection (ET) : Detection of surface cracks.
Ultrasonic inspection (UT) : detection of internal defects (sensitivity Φ0.5mm equivalent flat hole).
Laser caliper: Outer diameter closed loop control (accuracy ±0.01mm).

3. Post-processing technology
Heat treatment: bright annealing (hydrogen nitrogen protection atmosphere) to eliminate stress, hardness fluctuation ≤3HRC.
Straightening: multi-roll precision straightening, straightness ≤0.5mm/m.
Surface treatment:
Electrolytic polishing (EP) : For medical/food grade stainless steel tubes, Ra up to 0.2μm.
Coating: hot dip galvanizing (zinc layer ≥80μm) or electroless nickel plating (uniform thickness ±2μm).

4. Typical application areas
Automobile manufacturing: fuel injection pipe (tolerance ±0.03mm), hydraulic pipe.
Semiconductor equipment: Ultra-high clean gas delivery pipe (inner wall EP treatment, particle ≤Class 5).
Medical instruments: endoscopic catheter (Φ1~5mm, wall thickness 0.1mm).
Energy industry: Instrument tubes for nuclear power plants (SA213-TP347H material, intergranular corrosion test passed).

5. Quality control standards
International standard:
ASTM A269 (Universal Seamless and Welded Austenitic Stainless Steel Pipe)
EN 10305-4 (Precision welded pipes for hydraulic systems)
Industry certification: ISO 9001, PED 2014/68/EU (Pressure Equipment Directive).

6. Technological trends
Intelligent production: AI algorithm optimizes welding parameters, and the yield is increased to more than 99.5%.
Composite process: laser + arc composite welding, both efficiency and quality (speed increased by 30%).
Green manufacturing: low energy high frequency power supply (efficiency ≥90%), waste acid recovery ≥95%.

Through the above process optimization and strict quality control, the high-precision steel pipe produced by the pipe welding machine can meet the demanding requirements of size, performance and reliability in high-end industrial fields. In actual production, the process route needs to be customized according to the material characteristics and uses, for example, medical tubes need to undergo additional passivation treatment and biocompatibility testing.

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 
The relationship between pipe welding machine and automobile frame manufacturing
The relationship between pipe welding machine and automobile frame manufacturing
The relationship between pipe welding machine and automobile frame manufacturing is mainly reflected in the production process, material selection and process optimization. The following is a technical analysis of the relationship between the two:

1.The role of pipe welding machine in the manufacture of automobile frame
Pipe production: The welding pipe machine is used to manufacture high-precision welded steel pipes, which constitute the longitudinal beams, beams, anti-collision beams and other key components of the automobile frame. High frequency welding (HFW) or laser welding technology can produce steel pipes with uniform wall thickness and strength of more than 800MPa to meet the needs of lightweight.
Customized processing: Through flexible forming technology, the welding machine can produce special-shaped cross section pipes (such as rectangular, trapezoidal), adapt to the topology optimization design of different models of frames, improve space utilization and impact energy absorption efficiency.

2.The core requirements of the welding pipe process for automobile frames
Material properties: DP600/DP800 duplex steel or 22MnB5 thermoforming steel should be used, and online heat treatment (such as induction annealing) should be carried out after welding to ensure the microstructure consistency between the weld zone and the base material and avoid HAZ (heat affected zone) softening.
Dimensional accuracy: Diameter tolerance should be controlled within ±0.2mm, ellipticity ≤0.5%, to ensure the matching accuracy of the assembly and stamping parts (clearance <0.5mm).

3.Key technology breakthrough point
Laser-MAG composite welding: the penetration depth can reach 8mm, the welding speed is increased to 6m/min, the heat input is reduced by 30%, and the welding deformation of the frame is significantly reduced (≤1.5mm/m).
Online quality monitoring: high-speed CCD vision system (sampling rate 2000fps) with eddy current detection, to achieve real-time detection of weld defects, miss rate <0.01%.

4.Cost-performance balance
Compared with the stamping and welding structure, the welded pipe frame can reduce the weight by 15-20%, the material utilization rate is increased to 95%, and the manufacturing cost of the bicycle is reduced by about 1200 yuan. However, it is necessary to increase the investment in roller forming molds (about 2 million yuan/set).

5.Industry Application Cases
- An independent brand pure level station adopts 3D variable cross-section welded pipe subframe, with torsional rigidity increased to 27000Nm/°, 40% higher than the traditional structure, and the battery pack space utilization increased by 12%.

Conclusion
The penetration rate of welded pipe technology in the field of automotive frames is growing at a rate of 8% per year, and future development directions include:
Intelligent welded pipe system (digital twin model real-time control molding parameters)
Magnesium alloy /CFRP composite pipe welding process
Topological optimization driven continuous forming technology for variable thickness pipes

It is recommended to pay attention to the update of the ISO 15614 standard and the latest certification requirements for automotive welded pipe processes in ASME BPVC Section IX to ensure technical compliance.

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 
Detail
The relationship between pipe welding machine and automobile frame manufacturing is mainly reflected in the production process, material selection and process optimization. The following is a technical analysis of the relationship between the two:

1.The role of pipe welding machine in the manufacture of automobile frame
Pipe production: The welding pipe machine is used to manufacture high-precision welded steel pipes, which constitute the longitudinal beams, beams, anti-collision beams and other key components of the automobile frame. High frequency welding (HFW) or laser welding technology can produce steel pipes with uniform wall thickness and strength of more than 800MPa to meet the needs of lightweight.
Customized processing: Through flexible forming technology, the welding machine can produce special-shaped cross section pipes (such as rectangular, trapezoidal), adapt to the topology optimization design of different models of frames, improve space utilization and impact energy absorption efficiency.

2.The core requirements of the welding pipe process for automobile frames
Material properties: DP600/DP800 duplex steel or 22MnB5 thermoforming steel should be used, and online heat treatment (such as induction annealing) should be carried out after welding to ensure the microstructure consistency between the weld zone and the base material and avoid HAZ (heat affected zone) softening.
Dimensional accuracy: Diameter tolerance should be controlled within ±0.2mm, ellipticity ≤0.5%, to ensure the matching accuracy of the assembly and stamping parts (clearance <0.5mm).

3.Key technology breakthrough point
Laser-MAG composite welding: the penetration depth can reach 8mm, the welding speed is increased to 6m/min, the heat input is reduced by 30%, and the welding deformation of the frame is significantly reduced (≤1.5mm/m).
Online quality monitoring: high-speed CCD vision system (sampling rate 2000fps) with eddy current detection, to achieve real-time detection of weld defects, miss rate <0.01%.

4.Cost-performance balance
Compared with the stamping and welding structure, the welded pipe frame can reduce the weight by 15-20%, the material utilization rate is increased to 95%, and the manufacturing cost of the bicycle is reduced by about 1200 yuan. However, it is necessary to increase the investment in roller forming molds (about 2 million yuan/set).

5.Industry Application Cases
- An independent brand pure level station adopts 3D variable cross-section welded pipe subframe, with torsional rigidity increased to 27000Nm/°, 40% higher than the traditional structure, and the battery pack space utilization increased by 12%.

Conclusion
The penetration rate of welded pipe technology in the field of automotive frames is growing at a rate of 8% per year, and future development directions include:
Intelligent welded pipe system (digital twin model real-time control molding parameters)
Magnesium alloy /CFRP composite pipe welding process
Topological optimization driven continuous forming technology for variable thickness pipes

It is recommended to pay attention to the update of the ISO 15614 standard and the latest certification requirements for automotive welded pipe processes in ASME BPVC Section IX to ensure technical compliance.

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