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The reasons for the formation of burrs in the used HFW pipe units

The reasons for the formation of burrs in the used HFW pipe units

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  • Release time:2022-03-19 11:30
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【概要描述】There are 7 reasons for the formation of burrs in the used HWF pipe units. There are mainly ① high frequency welding power is too high. ②The docking form is not ideal. ③ Improper adjustment of cooling air. ④ Improper adjustment of cooling water. ⑤ The inner burr knife is not adjusted properly. ⑥The upper idler and lower drag roller are not running well. ⑦The welding seam is twisted.

The reasons for the formation of burrs in the used HFW pipe units

【概要描述】There are 7 reasons for the formation of burrs in the used HWF pipe units. There are mainly ① high frequency welding power is too high. ②The docking form is not ideal. ③ Improper adjustment of cooling air. ④ Improper adjustment of cooling water. ⑤ The inner burr knife is not adjusted properly. ⑥The upper idler and lower drag roller are not running well. ⑦The welding seam is twisted.

  • Sort:Information
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  • Source:
  • Release time:2022-03-19 11:30
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Detail

There are 7 reasons for the formation of burrs in the used HWF pipe units. There are mainly ① high frequency welding power is too high. ②The docking form is not ideal. ③ Improper adjustment of cooling air. ④ Improper adjustment of cooling water. ⑤ The inner burr knife is not adjusted properly. ⑥The upper idler and lower drag roller are not running well. ⑦The welding seam is twisted.

 

(1) High frequency welding power is too high

In the production process of used HWF pipe units, high-frequency welding operators often judge the level of welding power by the color and shape of the outer burr. The shape and color of the outer burr is related to the shape of the edge of the strip during welding. The shape and color of the outer burr are different due to the different shape of the edge of the strip. The inexperienced operators often make misjudgments, resulting in excessive welding power. A tumor is formed.

 

①Wrong side. In the process of high frequency extrusion welding, the edge of the strip is dislocated.

 

Used HFW pipe units

 

② Excessive curvature of one side of the plate edge: In the process of rough forming or fine forming, the rolling force on one edge of the plate may be greater than that of the other due to the deformation of the roll stand after long-term use, the poor operation of the roll bearing, etc. side so that the curvatures of the sides of the board are different.

 

Used HFW pipe units

 

③ There is chamfering or rounding on one side of the plate:before high-frequency extrusion welding, the plate edge needs to go through crane hoisting, uncoiling, shearing butt welding, looping, forming and other processes after longitudinal shearing. Chamfer or fillet the edge of one of the boards.

 

Used HFW pipe units

 

The above three situations can cause uneven size on both sides of the outer burr during welding, which will cause the operator to misjudge the welding state and cause the welding power to be too large.

 

(2) The docking form is not ideal

The following shows three types of edge butt joints during welding. Among them, the most ideal butt joint state is that the edges of the two plates are I-shaped (Fig. a), and the welding quality is good.

 

Used HFW pipe units

 

If the edge of the plate is V-shaped (Figure b), it will cause the V-shaped area at the bottom to converge first during the welding process, and a large amount of current will pass through the inner surface, causing the metal in the inner weld area to be overheated and melted; Even in order to make the metal in the outer weld area reach a molten state, the welding power must be increased, which will cause the welding temperature to be too high, resulting in a large number of welding beads, resulting in the formation of large particle buildup, and in this welding state, the outer burr is small. , the inner burr is larger, and the scraping amount of the inner burr is large.

 

Used HFW pipe units

 

If the edge state of the board is an inverted V shape (Fig. c), the outer burr is generally larger and the inner burr is smaller, so the inverted V shape of the board edge should be avoided as much as possible during welding.

 

Used HFW pipe units

 

(3) Improper adjustment of cooling air

The cooling air on the inner burr blade plays a very important role in the scraping process of the inner burr blade. In addition to discharging slag to prevent welding slag from accumulating on the blade or burning the protective cover, it can also cool the inner burr to prevent internal burrs. The sticking of the knife occurs during the scraping process of the burr knife.

However, in actual production, it is often prone to the accumulation of nodules caused by the low cooling air pressure on the inner burr shank and the incorrect position of the tuyere. If the cooling air pressure is too small, there will not be enough force to blow away the welding slag, which will cause small particles to accumulate and accumulate on the tool shank or knife; The position cannot be blown slag, thus forming a buildup.

 

(4) Improper adjustment of cooling water

In addition to cooling the magnetic rod, the cooling water of the inner burr arbor can also play the role of removing the welding flash and welding slag falling on the front end of the protective sleeve during welding, so as to prevent the accumulation of hard lumps on the arbor. In the actual production process, due to the leakage or blockage of the water pipeline, the water pressure at the water outlet will be too low, and the accumulation formed at the front end of the resistor cannot be washed.

 

(5) Improper adjustment of the inner burr knife

In actual production, due to the improper cutting angle of the selected inner burr knife, improper adjustment of the burr knife bar, or a gap in the inner burr knife and other, the inner burr will not be scraped smoothly, and it is also easy to cause accumulation.

 

(6) Poor operation of the upper and lower idlers

In the actual production of the second-hand high-frequency welded pipe unit, the operator easily ignores the operation status of the upper and lower idlers on the inner burr bar. Due to improper inspection or improper adjustment, the idler cannot rotate normally. Once the upper and lower idlers are in poor operation (Figure 7~8), a large amount of welding slag formed during the welding process will accumulate at the idler and cannot be discharged, forming weld flashes, affecting the normal lifting of the tool bar or causing the tool bar to rise. Location changed. The poor operation of the upper idler causes the accumulation of lumps on the idler to be too large, the tool bar cannot be lifted normally or the tool bar is deviated, so that the burrs in the welded pipe are not removed well or not removed; The height of the pad or the deviation of the tool bar will cause the burr in the welded pipe to be scraped off, deep scraped or sheared butt welding joint cannot drop the knife normally when it passes through the high frequency welding position.

 

Used HFW pipe units

 

Used HFW pipe units

 

(7) Weld torsion

For small-diameter steel pipes, the welds are prone to torsion. When the welding seam is severely twisted, it will cause the internal burr to be scraped and even the welding flash will appear.

 

According to the reasons for the accumulation of burrs in the 7 kinds of used HWF pipe units, we need to prescribe the right medicine to prevent the accumulation of tumors from affecting the second-hand high-frequency welded pipe unit to produce welded pipes.

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Assessing the condition of a used slitting line requires a systematic approach to determine its operational capability and remaining service life. Unlike new equipment, pre-owned machines exhibit varying degrees of wear that directly impact performance and value. Below are essential factors to consider when evaluating a used slitting line.

Structural Integrity and Frame Condition
The machine's frame serves as the foundation for precision operations. Inspect for signs of structural fatigue, including cracks, welds, or deformations in the main frame. Check for corrosion, particularly in environments where the used slitting line may have been exposed to moisture or chemicals. A laser alignment test can reveal whether critical components remain properly positioned after years of operation.

Mechanical Wear of Core Components
Examine high-wear components such as shafts, bearings, and gears for excessive play or scoring. The decoiler and recoiler mandrels should be evaluated for straightness and grip strength. On the slitting unit, inspect spindle runout and blade holder conditions. These elements directly affect the machine's ability to maintain tolerances during operation.

Electrical System and Control Reliability
Assess the condition of motors, drives, and control systems. Older used slitting lines may have obsolete electrical components that require upgrading. Test the responsiveness of the PLC or CNC interface and check for consistency in tension control systems. Modernization potential should be considered when evaluating long-term viability.

Hydraulic and Pneumatic Performance
Hydraulic systems in a used slitting line often show signs of leakage or pressure loss. Inspect cylinders, valves, and pumps for proper operation. Pneumatic components should be checked for air leaks and actuator responsiveness. Fluid analysis can reveal contamination levels in hydraulic systems.

Blade Condition and Cutting Accuracy
The slitting knives and associated tooling represent critical wear components. Measure blade sharpness and check for chips or uneven wear patterns. Evaluate the blade adjustment mechanisms for smooth operation and precision. Test cuts on sample material reveal the machine's current cutting capability.

Material Handling System Functionality
Assess the condition of levelers, straighteners, and feed systems. Look for worn rollers, misaligned guides, and tension measurement accuracy. The material handling system significantly impacts the final product quality and operational efficiency of the used slitting line.

Documentation and Service History Review
Request maintenance records and operational logs to understand the machine's service background. Regular servicing and proper lubrication history indicate better-preserved conditions. Verify hours of operation and review any major repairs or component replacements.

Performance Testing Under Load
Conduct trial runs with actual production materials to evaluate the used slitting line under working conditions. Monitor vibration levels, noise patterns, and temperature variations during operation. Measure slit material for dimensional accuracy and edge quality to assess current capabilities.

Obsolescence and Upgrade Potential
Evaluate whether the machine's technology remains relevant for current production needs. Consider the availability of replacement parts and potential upgrade paths for control systems or critical components. Some older used slitting lines offer excellent mechanical foundations for modernization.

Economic Value Assessment
Compare the machine's condition against current market prices for similar equipment. Factor in potential refurbishment costs and expected service life to determine true value. A thorough evaluation helps avoid unexpected expenses after purchase.

By systematically examining these aspects, buyers can make informed decisions about a used slitting line's suitability for their production requirements. Professional inspection services can provide additional assurance when evaluating higher-value equipment.

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
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Assessing the condition of a used slitting line requires a systematic approach to determine its operational capability and remaining service life. Unlike new equipment, pre-owned machines exhibit varying degrees of wear that directly impact performance and value. Below are essential factors to consider when evaluating a used slitting line.

Structural Integrity and Frame Condition
The machine's frame serves as the foundation for precision operations. Inspect for signs of structural fatigue, including cracks, welds, or deformations in the main frame. Check for corrosion, particularly in environments where the used slitting line may have been exposed to moisture or chemicals. A laser alignment test can reveal whether critical components remain properly positioned after years of operation.

Mechanical Wear of Core Components
Examine high-wear components such as shafts, bearings, and gears for excessive play or scoring. The decoiler and recoiler mandrels should be evaluated for straightness and grip strength. On the slitting unit, inspect spindle runout and blade holder conditions. These elements directly affect the machine's ability to maintain tolerances during operation.

Electrical System and Control Reliability
Assess the condition of motors, drives, and control systems. Older used slitting lines may have obsolete electrical components that require upgrading. Test the responsiveness of the PLC or CNC interface and check for consistency in tension control systems. Modernization potential should be considered when evaluating long-term viability.

Hydraulic and Pneumatic Performance
Hydraulic systems in a used slitting line often show signs of leakage or pressure loss. Inspect cylinders, valves, and pumps for proper operation. Pneumatic components should be checked for air leaks and actuator responsiveness. Fluid analysis can reveal contamination levels in hydraulic systems.

Blade Condition and Cutting Accuracy
The slitting knives and associated tooling represent critical wear components. Measure blade sharpness and check for chips or uneven wear patterns. Evaluate the blade adjustment mechanisms for smooth operation and precision. Test cuts on sample material reveal the machine's current cutting capability.

Material Handling System Functionality
Assess the condition of levelers, straighteners, and feed systems. Look for worn rollers, misaligned guides, and tension measurement accuracy. The material handling system significantly impacts the final product quality and operational efficiency of the used slitting line.

Documentation and Service History Review
Request maintenance records and operational logs to understand the machine's service background. Regular servicing and proper lubrication history indicate better-preserved conditions. Verify hours of operation and review any major repairs or component replacements.

Performance Testing Under Load
Conduct trial runs with actual production materials to evaluate the used slitting line under working conditions. Monitor vibration levels, noise patterns, and temperature variations during operation. Measure slit material for dimensional accuracy and edge quality to assess current capabilities.

Obsolescence and Upgrade Potential
Evaluate whether the machine's technology remains relevant for current production needs. Consider the availability of replacement parts and potential upgrade paths for control systems or critical components. Some older used slitting lines offer excellent mechanical foundations for modernization.

Economic Value Assessment
Compare the machine's condition against current market prices for similar equipment. Factor in potential refurbishment costs and expected service life to determine true value. A thorough evaluation helps avoid unexpected expenses after purchase.

By systematically examining these aspects, buyers can make informed decisions about a used slitting line's suitability for their production requirements. Professional inspection services can provide additional assurance when evaluating higher-value equipment.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

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Space Allocation and Layout Planning
Adequate floor space must be allocated to accommodate the entire slitting line, including material storage areas. The layout should allow for smooth coil loading and unloading operations, with sufficient clearance for overhead cranes or forklifts. Since a used slitting line may require more frequent maintenance access, additional space around critical components like the slitter head and tension stations should be incorporated.

Floor Load Capacity and Foundation Requirements
The chosen location must have a reinforced concrete floor capable of supporting the substantial weight of both the machinery and coiled materials. Older slitting lines often have heavier frames compared to modern equivalents, making floor strength assessment crucial. Vibration dampening considerations should be addressed, especially if the equipment shows signs of increased vibration due to wear.

Material Flow Optimization
The workspace should facilitate logical material movement from raw coil storage through processing to finished product staging. For a used slitting line, particular attention should be paid to entry and exit points to prevent material handling bottlenecks. The layout must account for any peculiarities in the machine's feeding or discharge mechanisms that may have developed during its previous service life.

Environmental Conditions Control
Maintaining stable environmental conditions helps preserve the accuracy of a used slitting line. The area should be protected from extreme temperature fluctuations and humidity variations that could affect material properties or machine tolerances. Proper ventilation is essential, especially when processing materials that generate dust or fumes.

Power Supply and Utility Requirements
A used slitting line may have specific electrical needs based on its original configuration and any subsequent modifications. The workspace must provide appropriate power capacity, including voltage stability and phase requirements. Compressed air lines, hydraulic power units, and coolant systems should be positioned for optimal machine performance.

Safety Zones and Emergency Access
Clear safety perimeters must be established around the slitting line, accounting for the machine's age and potential reliability issues. Emergency stop buttons and fire suppression equipment should be easily accessible. The layout should enable quick evacuation routes and provide space for safety barriers where needed.

Lighting and Visibility Considerations
Adequate lighting is particularly important for older equipment where visual inspection of material quality and machine operation is crucial. Task lighting should be positioned to illuminate critical areas such as the slitting zone and tension monitoring points without creating glare or shadows.

Future Expansion and Flexibility
When siting a used slitting line, consideration should be given to potential future upgrades or reconfigurations. The workspace should allow for possible additions of auxiliary equipment or modifications to the material handling system.

Noise Control Measures
Older slitting lines may generate higher noise levels, requiring appropriate acoustic treatment of the workspace. This could include sound-absorbing wall panels or strategic placement of noise barriers between the equipment and operator stations.

By carefully evaluating these factors when selecting a production site, operators can maximize the efficiency and service life of a used slitting line while maintaining a safe working environment. The workspace should be periodically reassessed as the machine's performance characteristics evolve over time.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

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The proper selection and preparation of a production site are critical factors in ensuring optimal performance and safety when operating a used slitting line. Unlike new equipment, second-hand machinery may have specific spatial and environmental needs due to previous usage patterns or wear conditions. Below are key considerations for selecting an appropriate workspace for a used slitting line.

Space Allocation and Layout Planning
Adequate floor space must be allocated to accommodate the entire slitting line, including material storage areas. The layout should allow for smooth coil loading and unloading operations, with sufficient clearance for overhead cranes or forklifts. Since a used slitting line may require more frequent maintenance access, additional space around critical components like the slitter head and tension stations should be incorporated.

Floor Load Capacity and Foundation Requirements
The chosen location must have a reinforced concrete floor capable of supporting the substantial weight of both the machinery and coiled materials. Older slitting lines often have heavier frames compared to modern equivalents, making floor strength assessment crucial. Vibration dampening considerations should be addressed, especially if the equipment shows signs of increased vibration due to wear.

Material Flow Optimization
The workspace should facilitate logical material movement from raw coil storage through processing to finished product staging. For a used slitting line, particular attention should be paid to entry and exit points to prevent material handling bottlenecks. The layout must account for any peculiarities in the machine's feeding or discharge mechanisms that may have developed during its previous service life.

Environmental Conditions Control
Maintaining stable environmental conditions helps preserve the accuracy of a used slitting line. The area should be protected from extreme temperature fluctuations and humidity variations that could affect material properties or machine tolerances. Proper ventilation is essential, especially when processing materials that generate dust or fumes.

Power Supply and Utility Requirements
A used slitting line may have specific electrical needs based on its original configuration and any subsequent modifications. The workspace must provide appropriate power capacity, including voltage stability and phase requirements. Compressed air lines, hydraulic power units, and coolant systems should be positioned for optimal machine performance.

Safety Zones and Emergency Access
Clear safety perimeters must be established around the slitting line, accounting for the machine's age and potential reliability issues. Emergency stop buttons and fire suppression equipment should be easily accessible. The layout should enable quick evacuation routes and provide space for safety barriers where needed.

Lighting and Visibility Considerations
Adequate lighting is particularly important for older equipment where visual inspection of material quality and machine operation is crucial. Task lighting should be positioned to illuminate critical areas such as the slitting zone and tension monitoring points without creating glare or shadows.

Future Expansion and Flexibility
When siting a used slitting line, consideration should be given to potential future upgrades or reconfigurations. The workspace should allow for possible additions of auxiliary equipment or modifications to the material handling system.

Noise Control Measures
Older slitting lines may generate higher noise levels, requiring appropriate acoustic treatment of the workspace. This could include sound-absorbing wall panels or strategic placement of noise barriers between the equipment and operator stations.

By carefully evaluating these factors when selecting a production site, operators can maximize the efficiency and service life of a used slitting line while maintaining a safe working environment. The workspace should be periodically reassessed as the machine's performance characteristics evolve over time.

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
Personnel Training for Operating a Used Slitting Line
Personnel Training for Operating a Used Slitting Line
Personnel Training for Operating a Used Slitting Line

Proper training is essential for ensuring safe and efficient operation of a used slitting line. Since second-hand equipment may have unique wear patterns or modifications, operators must be thoroughly trained to handle its specific requirements. Below are key aspects of personnel training for a used slitting line:

Understanding Machine Components and Functions
Operators must familiarize themselves with all parts of the slitting line, including the decoiler, slitter, tension control system, and recoiler. Training should cover the purpose of each component, common wear points, and how to identify signs of malfunction. Since a used slitting line may have undergone previous repairs or adjustments, operators should learn its specific configuration.

Safety Procedures and Emergency Protocols
Safety training is critical when working with a used slitting line. Operators must understand lockout/tagout (LOTO) procedures to prevent accidental startups during maintenance. They should also be trained on emergency stop functions, proper PPE usage, and how to handle material jams safely. Since older machines may lack modern safety features, extra caution is necessary.

Material Handling and Setup
Proper material loading and alignment are crucial for smooth operation. Training should include how to safely mount and center coils on the decoiler, adjust tension controls, and thread material through the slitting line. Operators should learn how to select and install the correct blades for different materials, as improper setup can lead to poor cuts or machine damage.

Blade Maintenance and Adjustment
Since blade wear is a common issue in used slitting lines, operators must be trained in blade inspection, sharpening, and replacement. They should understand how to adjust blade gaps for different material thicknesses and recognize when blades need servicing. Proper handling techniques should be emphasized to prevent injuries.

Troubleshooting Common Issues
Operators should be trained to identify and resolve frequent problems in a used slitting line, such as misaligned material, uneven tension, or blade chatter. Training should include basic diagnostic steps and when to escalate issues to maintenance personnel. Documenting recurring problems can help improve long-term reliability.

Preventive Maintenance Practices
Regular maintenance is key to extending the lifespan of a used slitting line. Operators should learn daily inspection routines, lubrication points, and how to clean critical components. Training should emphasize the importance of reporting unusual noises, vibrations, or performance changes before they lead to major failures.

Quality Control and Inspection
Operators must understand how to check slit material for defects such as burrs, edge waves, or dimensional inaccuracies. Training should include using measuring tools and maintaining consistent quality standards. Since a used slitting line may have slight deviations, operators should know how to compensate for them.

Handover and Shift Communication
In multi-shift operations, clear communication is vital. Operators should be trained in proper handover procedures, including reporting machine status, ongoing issues, and maintenance needs. This ensures smooth transitions and reduces downtime.

By implementing comprehensive training programs, companies can maximize the efficiency and safety of a used slitting line, reducing operational risks and improving productivity. Regular refresher courses should be conducted to keep skills updated.

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
Personnel Training for Operating a Used Slitting Line

Proper training is essential for ensuring safe and efficient operation of a used slitting line. Since second-hand equipment may have unique wear patterns or modifications, operators must be thoroughly trained to handle its specific requirements. Below are key aspects of personnel training for a used slitting line:

Understanding Machine Components and Functions
Operators must familiarize themselves with all parts of the slitting line, including the decoiler, slitter, tension control system, and recoiler. Training should cover the purpose of each component, common wear points, and how to identify signs of malfunction. Since a used slitting line may have undergone previous repairs or adjustments, operators should learn its specific configuration.

Safety Procedures and Emergency Protocols
Safety training is critical when working with a used slitting line. Operators must understand lockout/tagout (LOTO) procedures to prevent accidental startups during maintenance. They should also be trained on emergency stop functions, proper PPE usage, and how to handle material jams safely. Since older machines may lack modern safety features, extra caution is necessary.

Material Handling and Setup
Proper material loading and alignment are crucial for smooth operation. Training should include how to safely mount and center coils on the decoiler, adjust tension controls, and thread material through the slitting line. Operators should learn how to select and install the correct blades for different materials, as improper setup can lead to poor cuts or machine damage.

Blade Maintenance and Adjustment
Since blade wear is a common issue in used slitting lines, operators must be trained in blade inspection, sharpening, and replacement. They should understand how to adjust blade gaps for different material thicknesses and recognize when blades need servicing. Proper handling techniques should be emphasized to prevent injuries.

Troubleshooting Common Issues
Operators should be trained to identify and resolve frequent problems in a used slitting line, such as misaligned material, uneven tension, or blade chatter. Training should include basic diagnostic steps and when to escalate issues to maintenance personnel. Documenting recurring problems can help improve long-term reliability.

Preventive Maintenance Practices
Regular maintenance is key to extending the lifespan of a used slitting line. Operators should learn daily inspection routines, lubrication points, and how to clean critical components. Training should emphasize the importance of reporting unusual noises, vibrations, or performance changes before they lead to major failures.

Quality Control and Inspection
Operators must understand how to check slit material for defects such as burrs, edge waves, or dimensional inaccuracies. Training should include using measuring tools and maintaining consistent quality standards. Since a used slitting line may have slight deviations, operators should know how to compensate for them.

Handover and Shift Communication
In multi-shift operations, clear communication is vital. Operators should be trained in proper handover procedures, including reporting machine status, ongoing issues, and maintenance needs. This ensures smooth transitions and reduces downtime.

By implementing comprehensive training programs, companies can maximize the efficiency and safety of a used slitting line, reducing operational risks and improving productivity. Regular refresher courses should be conducted to keep skills updated.

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
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