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Weld quality failure caused by used welded pipe machines
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【概要描述】When manufacturing welded pipes for used welded pipe machines, judging that the quality of the welded pipes meets the standard depends on the quality of the welds. Therefore, the quality of the weld is very important, so sometimes it is necessary to rule out the quality of the weld. We perform analyses to understand weld quality failures.
Weld quality failure caused by used welded pipe machines
【概要描述】When manufacturing welded pipes for used welded pipe machines, judging that the quality of the welded pipes meets the standard depends on the quality of the welds. Therefore, the quality of the weld is very important, so sometimes it is necessary to rule out the quality of the weld. We perform analyses to understand weld quality failures.
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- Release time：2022-12-23 11:30
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Detail
When manufacturing welded pipes for used welded pipe machines, judging that the quality of the welded pipes meets the standard depends on the quality of the welds. Therefore, the quality of the weld is very important, so sometimes it is necessary to rule out the quality of the weld. We perform analyses to understand weld quality failures.
These weld quality failures will occur when the used welded pipe machines is making pipes: ① through-length lap welding. ② Periodic lap welding. ③ Open the seam. ④ Trachoma. ⑤ Peach-shaped tube. ⑥ Weld seam gnawed. ⑦Outer burr planing. ⑧ Heating. ⑨ The current is small. ⑩ Melting of induction coils and electrodes. ⑪ Fire. ⑫ "No high pressure" phenomenon. We can summarize 12 causes of weld quality failures.
Slit
Slitting refers to the phenomenon that the welds are not bonded together. The length of the slits is generally more than a few centimeters or even longer. The main reasons are as follows:
(1) The hole type is worn. With the wear of the extrusion roll pass, the R dimension of the pass gradually increases. When the hot-rolled steel strip is used as the raw material for the welded pipe, when the width of the steel strip has a negative deviation or the steel is slightly stretched, the quality of the weld will have problems. production. Therefore, it is necessary to constantly check the internal burr of the welded pipe, increase the extrusion amount of the squeeze roller, or replace the new hole type in time.
(2) The bearing is damaged. When the bearing of the squeeze roller is only slightly damaged, there will be weld quality problems such as trachoma tubes and lap welded tubes. The seam becomes a fully open shape, accompanied by other quality accidents. At this time, we can also observe the squeeze roller with damaged bearing, and the swing amplitude will become larger as the degree of bearing damage increases.
(3) Magnet (resistor).The magnetic bar will form a magnetic field during the welding process of the tube blank, and the high-frequency current can be highly concentrated in the "V"-shaped area of the welding seam, so that the welding seam can reach a high temperature point in a very short time. If there is no magnetic rod in the tube, it will have a great influence on the proximity effect and skin effect of high-frequency current. The most obvious feature is that the welding seam is black and red, without splashing sparks, and the welding seam is fully open. Sometimes even if it is welded, it is false welding, and the popping sound of the horn will occur when the pipe is sizing. If the magnet bar fails or the installation position is not suitable, the welded pipe will burst, even if it does not crack, its strength is very low. At this time, the weld is generally yellow or light blue cracking due to insufficient hot spot temperature.
(4) Raw material. Due to the chemical composition of the raw materials, although it is relatively normal during the welding process, the weld will still crack. At this time, the color of the weld is relatively blue, indicating that the temperature is still normal. Sometimes we can see that the crack of the weld deviates from the center of the weld, which is to stick the edge of the base metal to form an irregular seam, which is purely a brittle crack caused by the chemical composition of the raw material.
The above is one of the reasons for the quality failure of the welding seam when the used welded pipe machines is making pipes, which is the opening of the seam. The main reasons for the formation of slits are (1) wear of the hole type. (2) The bearing is damaged. (3) Magnetic rod (impedance device). (4) Raw materials.
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Evaluation of 76-127 Used Pipe Welding Machine Unit: Performance, Applications and Market Value Analysis
Time of issue : 2025-04-24
With increasing emphasis on cost control and environmental protection in manufacturing, used pipe welding machines have become a popular choice for SMEs due to their cost-effectiveness and sustainability. This article takes the 76-127 model as an example, providing a comprehensive analysis from multiple dimensions including technical parameters, equipment configuration, quality assessment, market advantages and industrial applications.
1. Technical Parameters and Equipment Configuration
The 76-127 used pipe welding machine unit is renowned for its high efficiency and flexibility, with core parameters as follows:
Processing range: Capable of producing square pipes (Φ40-100) and round pipes (Φ50-127) with wall thickness up to 5mm, at a production speed of 60m/min.
Key configurations:
Forming and welding: Includes 7 horizontal rolls and 9 vertical rolls forming unit, paired with 300kW solid-state high-frequency welder to ensure stable weld quality.
Auxiliary systems: Hydraulic uncoiler, shear welder, computer flying saw and Turk's head straightening device to enhance automation.
Process flow: Strip uncoiling→leveling→forming→high-frequency welding→cooling→sizing→cutting, ensuring continuous high-efficiency production.
The modular design simplifies maintenance, and after refurbishment, its performance approaches that of new machines while reducing procurement costs by 40%-60%, making it ideal for budget-conscious enterprises.
2. Key Points for Quality Assessment
According to industry standards, the quality of used pipe welding machines should be comprehensively evaluated from four aspects:
Materials and processes
Material durability: Core components such as rolls and high-frequency welders should be original to ensure corrosion resistance and tensile strength.
Process control: Welding quality directly affects joint strength, requiring precise regulation of high-frequency current's skin effect and proximity effect.
Appearance and performance
Visual inspection: The unit surface should be free of rust and deformation, with no significant wear on molds.
Performance test: Verify production speed, sizing accuracy (e.g. ovality ±0.05mm) and flying saw synchronization through trial operation.
After-sales service
Reputable suppliers like Jinyujie Electromechanical provide installation, spare parts support and technical training to reduce operational risks.
3. Market Advantages and Environmental Value
Cost-effectiveness
The 76-127 model typically costs only 50%-60% of new equipment while being ready for immediate use.
A Zhejiang-based enterprise reported 30% productivity improvement with significantly better ROI.
Sustainability
Refurbishing used equipment reduces resource waste, aligning with green manufacturing trends.
Industry adaptability
Widely used in construction (guardrails, scaffolding), automotive (exhaust pipes) and energy (oil pipelines) sectors, supporting various materials including carbon steel and stainless steel.
4. Maintenance and Risk Control
Routine maintenance
Regular lubrication and inspection of key components to prevent rust and damage.
Operation standards
Operators should receive proper training and wear protective equipment.
Procurement risks
Verify equipment sources and clarify responsibilities through formal agreements.
5. Industry Trends and Selection Recommendations
The domestic used pipe welding machine market grew 25% YoY in 2023, with increasing share of refurbished imported equipment. Selection suggestions:
Match production needs with equipment specifications
Choose reputable suppliers with comprehensive after-sales services
Conclusion
The 76-127 used pipe welding machine unit, with its mature technology, low cost and environmental benefits, has become an optimal choice for manufacturers seeking efficiency improvements. Enterprises should combine quality assessment, maintenance strategies and supplier services to maximize equipment value and promote sustainable development.
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
With increasing emphasis on cost control and environmental protection in manufacturing, used pipe welding machines have become a popular choice for SMEs due to their cost-effectiveness and sustainability. This article takes the 76-127 model as an example, providing a comprehensive analysis from multiple dimensions including technical parameters, equipment configuration, quality assessment, market advantages and industrial applications.
1. Technical Parameters and Equipment Configuration
The 76-127 used pipe welding machine unit is renowned for its high efficiency and flexibility, with core parameters as follows:
Processing range: Capable of producing square pipes (Φ40-100) and round pipes (Φ50-127) with wall thickness up to 5mm, at a production speed of 60m/min.
Key configurations:
Forming and welding: Includes 7 horizontal rolls and 9 vertical rolls forming unit, paired with 300kW solid-state high-frequency welder to ensure stable weld quality.
Auxiliary systems: Hydraulic uncoiler, shear welder, computer flying saw and Turk's head straightening device to enhance automation.
Process flow: Strip uncoiling→leveling→forming→high-frequency welding→cooling→sizing→cutting, ensuring continuous high-efficiency production.
The modular design simplifies maintenance, and after refurbishment, its performance approaches that of new machines while reducing procurement costs by 40%-60%, making it ideal for budget-conscious enterprises.
2. Key Points for Quality Assessment
According to industry standards, the quality of used pipe welding machines should be comprehensively evaluated from four aspects:
Materials and processes
Material durability: Core components such as rolls and high-frequency welders should be original to ensure corrosion resistance and tensile strength.
Process control: Welding quality directly affects joint strength, requiring precise regulation of high-frequency current's skin effect and proximity effect.
Appearance and performance
Visual inspection: The unit surface should be free of rust and deformation, with no significant wear on molds.
Performance test: Verify production speed, sizing accuracy (e.g. ovality ±0.05mm) and flying saw synchronization through trial operation.
After-sales service
Reputable suppliers like Jinyujie Electromechanical provide installation, spare parts support and technical training to reduce operational risks.
3. Market Advantages and Environmental Value
Cost-effectiveness
The 76-127 model typically costs only 50%-60% of new equipment while being ready for immediate use.
A Zhejiang-based enterprise reported 30% productivity improvement with significantly better ROI.
Sustainability
Refurbishing used equipment reduces resource waste, aligning with green manufacturing trends.
Industry adaptability
Widely used in construction (guardrails, scaffolding), automotive (exhaust pipes) and energy (oil pipelines) sectors, supporting various materials including carbon steel and stainless steel.
4. Maintenance and Risk Control
Routine maintenance
Regular lubrication and inspection of key components to prevent rust and damage.
Operation standards
Operators should receive proper training and wear protective equipment.
Procurement risks
Verify equipment sources and clarify responsibilities through formal agreements.
5. Industry Trends and Selection Recommendations
The domestic used pipe welding machine market grew 25% YoY in 2023, with increasing share of refurbished imported equipment. Selection suggestions:
Match production needs with equipment specifications
Choose reputable suppliers with comprehensive after-sales services
Conclusion
The 76-127 used pipe welding machine unit, with its mature technology, low cost and environmental benefits, has become an optimal choice for manufacturers seeking efficiency improvements. Enterprises should combine quality assessment, maintenance strategies and supplier services to maximize equipment value and promote sustainable development.
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
Furuiwo Used 140 Pipe Welding Machine Unit
Time of issue : 2025-04-23
Recently, Furuiwo launched its highly anticipated used pipe welding machine—the 140 model pipe welding unit. With outstanding processing capabilities and significant cost-performance advantages, this equipment has become an ideal choice for small and medium-sized pipe processing enterprises.
Core Performance: Precision and Efficiency for Diverse Needs
The Furuiwo 140 used pipe welding machine emphasizes practicality and stability, with key technical parameters as follows:
Processing Diameter Range: Φ60-159 mm, covering production needs from light-duty pipes to medium industrial pipelines;
Processing Thickness: Supports materials up to 5 mm, suitable for construction and machinery manufacturing;
Processing Speed: 60 meters/minute, significantly improving efficiency while reducing energy consumption.
The unit adopts a modular design for easy maintenance. After comprehensive inspection and upgrades by Furuiwo’s technical team, its performance is close to new machines, yet procurement costs are substantially lower.
Market Advantages: Economic and Environmental Value
Amid intensifying competition in manufacturing, used pipe welding machines are becoming a strategic choice for cost optimization. The Furuiwo 140 model stands out with the following advantages:
Cost Savings: Priced 40%-60% lower than new machines, ideal for budget-conscious SMEs;
Rapid Deployment: Pre-tested and ready for immediate use, shortening production setup time;
Sustainability: Extends equipment lifecycle, aligning with green manufacturing trends.
Wang Qiang, Furuiwo’s Sales Director, stated: “We are committed to providing high-value solutions. This used pipe welding machine not only ensures reliability but also comes with full after-sales support, including a one-year warranty and lifelong technical assistance.”
Applications: Versatility Across Industries
The unit processes carbon steel, stainless steel, and other materials, serving industries such as:
Construction: Production of guardrails and scaffold pipes;
Automotive: Exhaust pipes and chassis components;
Energy: Customized oil and water pipelines.
A Zhejiang-based pipe manufacturer reported: “After purchasing Furuiwo’s used pipe welding machine, our productivity increased by 30%, with costs halved compared to new equipment—ROI far exceeded expectations.”
Industry Outlook: Growing Demand for Used Equipment
As manufacturing upgrades, the used industrial equipment market is booming. Industry reports indicate a 25% year-on-year growth in China’s used pipe welding machine transactions in 2023, with refurbished imported brands gaining traction. Furuiwo, leveraging technical expertise and channel advantages, has emerged as a leader in this sector.
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
Recently, Furuiwo launched its highly anticipated used pipe welding machine—the 140 model pipe welding unit. With outstanding processing capabilities and significant cost-performance advantages, this equipment has become an ideal choice for small and medium-sized pipe processing enterprises.
Core Performance: Precision and Efficiency for Diverse Needs
The Furuiwo 140 used pipe welding machine emphasizes practicality and stability, with key technical parameters as follows:
Processing Diameter Range: Φ60-159 mm, covering production needs from light-duty pipes to medium industrial pipelines;
Processing Thickness: Supports materials up to 5 mm, suitable for construction and machinery manufacturing;
Processing Speed: 60 meters/minute, significantly improving efficiency while reducing energy consumption.
The unit adopts a modular design for easy maintenance. After comprehensive inspection and upgrades by Furuiwo’s technical team, its performance is close to new machines, yet procurement costs are substantially lower.
Market Advantages: Economic and Environmental Value
Amid intensifying competition in manufacturing, used pipe welding machines are becoming a strategic choice for cost optimization. The Furuiwo 140 model stands out with the following advantages:
Cost Savings: Priced 40%-60% lower than new machines, ideal for budget-conscious SMEs;
Rapid Deployment: Pre-tested and ready for immediate use, shortening production setup time;
Sustainability: Extends equipment lifecycle, aligning with green manufacturing trends.
Wang Qiang, Furuiwo’s Sales Director, stated: “We are committed to providing high-value solutions. This used pipe welding machine not only ensures reliability but also comes with full after-sales support, including a one-year warranty and lifelong technical assistance.”
Applications: Versatility Across Industries
The unit processes carbon steel, stainless steel, and other materials, serving industries such as:
Construction: Production of guardrails and scaffold pipes;
Automotive: Exhaust pipes and chassis components;
Energy: Customized oil and water pipelines.
A Zhejiang-based pipe manufacturer reported: “After purchasing Furuiwo’s used pipe welding machine, our productivity increased by 30%, with costs halved compared to new equipment—ROI far exceeded expectations.”
Industry Outlook: Growing Demand for Used Equipment
As manufacturing upgrades, the used industrial equipment market is booming. Industry reports indicate a 25% year-on-year growth in China’s used pipe welding machine transactions in 2023, with refurbished imported brands gaining traction. Furuiwo, leveraging technical expertise and channel advantages, has emerged as a leader in this sector.
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
Small cost replacement of 140 second-hand welded pipe equipment
Time of issue : 2025-03-21
Answer: Three core advantages:
The processing capacity of this used pipe making machine includes round pipes with diameter of 60-159mm, square and rectangular pipes with diameter of 50 * 50-120 * 120mm, anda wall thickness of 2.0-5.0mm, fully covering the mainstream demand of the welded pipe equipment market.
Refurbishment guarantee for Used ERW tube mill machinery: All mechanical and electrical components undergo professional maintenance/replacement, and the life assessment of key components meets the standards. The renovation and maintenance process for second-hand welded pipe equipment takes at least one month and up to three months.
The cost efficiency of the second-hand high-frequency welded pipe machine is only 45% of that of the new welded pipe machine. The production line of the used welded pipe mills production line sold by our company includes a one-year extended warranty, free training, and lifelong technical support.
Q: After purchasing second-hand welded pipe equipment, how long can it be put into production?
Answer: Jin Yujie Company's second-hand welded pipe equipment is all sourced from first-hand sources, with stock in the warehouse. It takes 7 days to ship and 15 days to complete installation and commissioning. The second-hand welded pipe unit can be purchased and used immediately.
It is recommended to arrange a technical team and decision-makers to conduct on-site inspections of the warehouse as soon as possible, select a second-hand welded pipe unit on site, in order to put it into production as soon as possible, create production capacity for the second-hand welded pipe production line, and achieve profitability.
more datail about this 140 enlarged 165 used tube mill line, please check here:
https://www.usedpipemill.com/product/Forever-Used-High-Frequency-Welding-Pipe-Making-Machie-of-%CE%A6140-Expand-to-%CE%A6165MM-221.html
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
Answer: Three core advantages:
The processing capacity of this used pipe making machine includes round pipes with diameter of 60-159mm, square and rectangular pipes with diameter of 50 * 50-120 * 120mm, anda wall thickness of 2.0-5.0mm, fully covering the mainstream demand of the welded pipe equipment market.
Refurbishment guarantee for Used ERW tube mill machinery: All mechanical and electrical components undergo professional maintenance/replacement, and the life assessment of key components meets the standards. The renovation and maintenance process for second-hand welded pipe equipment takes at least one month and up to three months.
The cost efficiency of the second-hand high-frequency welded pipe machine is only 45% of that of the new welded pipe machine. The production line of the used welded pipe mills production line sold by our company includes a one-year extended warranty, free training, and lifelong technical support.
Q: After purchasing second-hand welded pipe equipment, how long can it be put into production?
Answer: Jin Yujie Company's second-hand welded pipe equipment is all sourced from first-hand sources, with stock in the warehouse. It takes 7 days to ship and 15 days to complete installation and commissioning. The second-hand welded pipe unit can be purchased and used immediately.
It is recommended to arrange a technical team and decision-makers to conduct on-site inspections of the warehouse as soon as possible, select a second-hand welded pipe unit on site, in order to put it into production as soon as possible, create production capacity for the second-hand welded pipe production line, and achieve profitability.
more datail about this 140 enlarged 165 used tube mill line, please check here:
https://www.usedpipemill.com/product/Forever-Used-High-Frequency-Welding-Pipe-Making-Machie-of-%CE%A6140-Expand-to-%CE%A6165MM-221.html
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
Still worrying about production capacity? 140 refurbished welded pipe production line to relieve worries!
Time of issue : 2025-03-19
Answer: Three core advantages:
The processing capacity of this used pipe making machine includes round pipes with diameter of 60-159mm, square and rectangular pipes with diameter of 50 * 50-120 * 120mm, anda wall thickness of 2.0-5.0mm, fully covering the mainstream demand of the welded pipe equipment market.
Refurbishment guarantee for Used ERW tube mill machinery: All mechanical and electrical components undergo professional maintenance/replacement, and the life assessment of key components meets the standards. The renovation and maintenance process for second-hand welded pipe equipment takes at least one month and up to three months.
The cost efficiency of the second-hand high-frequency welded pipe machine is only 45% of that of the new welded pipe machine. The production line of the used welded pipe mills production line sold by our company includes a one-year extended warranty, free training, and lifelong technical support.
Q: After purchasing second-hand welded pipe equipment, how long can it be put into production?
Answer: Jin Yujie Company's second-hand welded pipe equipment is all sourced from first-hand sources, with stock in the warehouse. It takes 7 days to ship and 15 days to complete installation and commissioning. The second-hand welded pipe unit can be purchased and used immediately.
It is recommended to arrange a technical team and decision-makers to conduct on-site inspections of the warehouse as soon as possible, select a second-hand welded pipe unit on site, in order to put it into production as soon as possible, create production capacity for the second-hand welded pipe production line, and achieve profitability.
more datail about this 140 enlarged 165 used tube mill line, please check here:
https://www.usedpipemill.com/product/Forever-Used-High-Frequency-Welding-Pipe-Making-Machie-of-%CE%A6140-Expand-to-%CE%A6165MM-221.html
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
Answer: Three core advantages:
The processing capacity of this used pipe making machine includes round pipes with diameter of 60-159mm, square and rectangular pipes with diameter of 50 * 50-120 * 120mm, anda wall thickness of 2.0-5.0mm, fully covering the mainstream demand of the welded pipe equipment market.
Refurbishment guarantee for Used ERW tube mill machinery: All mechanical and electrical components undergo professional maintenance/replacement, and the life assessment of key components meets the standards. The renovation and maintenance process for second-hand welded pipe equipment takes at least one month and up to three months.
The cost efficiency of the second-hand high-frequency welded pipe machine is only 45% of that of the new welded pipe machine. The production line of the used welded pipe mills production line sold by our company includes a one-year extended warranty, free training, and lifelong technical support.
Q: After purchasing second-hand welded pipe equipment, how long can it be put into production?
Answer: Jin Yujie Company's second-hand welded pipe equipment is all sourced from first-hand sources, with stock in the warehouse. It takes 7 days to ship and 15 days to complete installation and commissioning. The second-hand welded pipe unit can be purchased and used immediately.
It is recommended to arrange a technical team and decision-makers to conduct on-site inspections of the warehouse as soon as possible, select a second-hand welded pipe unit on site, in order to put it into production as soon as possible, create production capacity for the second-hand welded pipe production line, and achieve profitability.
more datail about this 140 enlarged 165 used tube mill line, please check here:
https://www.usedpipemill.com/product/Forever-Used-High-Frequency-Welding-Pipe-Making-Machie-of-%CE%A6140-Expand-to-%CE%A6165MM-221.html
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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Tel: +86-13392281699
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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