The influence of operation on welding quality in the production of used EWR tube mills (1)
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- Release time:2023-07-29 11:30
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【概要描述】In the production process of used EWR tube mills welded pipe, there are many factors that will affect the final product quality of the welded pipe.
The influence of operation on welding quality in the production of used EWR tube mills (1)
【概要描述】In the production process of used EWR tube mills welded pipe, there are many factors that will affect the final product quality of the welded pipe.
- Sort:Information
- Auth:
- Source:
- Release time:2023-07-29 11:30
- Pvs:
In the production process of used EWR tube mills welded pipe, there are many factors that will affect the final product quality of the welded pipe.
There are 7 factors that affect the welding quality of the welding pipe production operation of the used EWR tube mills, namely ① input heat (ie power KW) ② welding pressure (extruding force) ③ welding speed (unit speed) ④ opening angle (Vee angle) ⑤ The placement position of the inductor (coil) and the resistor ⑥ the geometric size and shape of the tube blank ⑦ the quality of the strip edge, the following first introduces the reasons ①~④ that affect the welding quality.
1. Input heat (ie power KW)
Power is one of the main parameters of the welding process, which can be understood as the welding current (or welding temperature). Because the current is difficult to measure, it is replaced by the input heat, and the input heat can be represented by the output power of the oscillator.
When the input heat is insufficient, the heated edge of the strip steel cannot reach the welding temperature, and the solid structure is still maintained and cannot be welded, and welding cracks will be formed;
When the input heat is too large, the heated edge will exceed the welding temperature and will easily cause overheating, or even overburning, and cracks after being stressed. Excessive heat will cause the welding temperature to be too high, causing the weld to pierce, causing the molten metal to splash and form holes.
Continuous and stable output power of the welder is an important prerequisite for ensuring the quality of welded pipes.
2. Welding pressure (extrusion force)
The welding pressure is one of the main parameters of the welding process. After the two edges of the tube blank are heated to the welding temperature, the common metal crystal grains are formed under the action of the extrusion force, that is, mutual crystallization to produce welding. The size of the welding pressure affects the strength and toughness of the weld. If the applied welding pressure is small, the metal welding edge cannot be fully pressed together, and the residual non-metallic inclusions and metal oxides in the weld are not easily discharged due to the low pressure, the weld strength is reduced, and it is easy to crack after being stressed; At this time, most of the metal reaching the welding temperature is squeezed out, which not only reduces the strength of the weld, but also produces defects such as excessive internal and external burrs or lap welding. Therefore, the optimum welding pressure should be obtained in practice according to different varieties and specifications.
Excessive or too small squeezing force will affect the strength and toughness of the weld, just like squeezing acne. If the force is small, the squeezing will not be clean, and if the force is too high, the skin will be damaged.
3. Welding speed (unit speed)
The welding speed is also one of the main parameters of the welding process, which is related to the heating speed, the welding seam deformation speed and the mutual crystallization speed. When high-frequency welding is used in the used EWR tube mills, the welding quality improves with the increase in welding speed. This is because the shortening of the heating time narrows the width of the edge heating zone and shortens the time for forming metal oxides. If the welding speed is reduced, not only the heating zone becomes wider, but also the width of the melting zone changes with the input heat, forming an internal The burr is large. In low-speed welding, less heat input makes welding difficult, and defects are likely to occur if the specified value is not met.
When welding pipes with high frequency, the appropriate welding speed should be selected according to different specifications and varieties under the maximum speed allowed by the mechanical equipment and welding equipment of the unit.
4. Opening angle (Vee angle)
The opening angle refers to the angle between the two edges of the tube blank before the squeeze roll. The size of the opening angle is related to the stability of the sintering process and has a great influence on the welding quality.
When the opening angle is reduced, the distance between the edges is also reduced, so that the proximity effect is strengthened. Under the same other conditions, the heating temperature of the edges can be increased, thereby increasing the welding speed.
If the opening angle is too small, the distance from the meeting point to the centerline of the squeeze roll will be lengthened, resulting in that the edge of the steel strip is not squeezed at the highest temperature, which will reduce the welding quality and increase the power consumption.
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Time of issue : 2025-02-13
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
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

Time of issue : 2025-02-12
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
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

Time of issue : 2025-02-11
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
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

Time of issue : 2025-02-08
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
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
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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