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Used round tube forming machines, the cause of weld quality failure factors—cycle lap welding

Used round tube forming machines, the cause of weld quality failure factors—cycle lap welding

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  • Release time:2021-12-25 11:30
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【概要描述】Factors that cause weld quality failures in used round tube forming machines include ①lap welding.②cycle lap welding. ③opening. ④bathholes. The following is an introduction to the cycle lap welding, the factor that causes the quality of the weld.

Used round tube forming machines, the cause of weld quality failure factors—cycle lap welding

【概要描述】Factors that cause weld quality failures in used round tube forming machines include ①lap welding.②cycle lap welding. ③opening. ④bathholes. The following is an introduction to the cycle lap welding, the factor that causes the quality of the weld.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2021-12-25 11:30
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Detail

Factors that cause weld quality failures in used round tube forming machines include ①lap welding.②cycle lap welding. ③opening. ④bathholes. The following is an introduction to the cycle lap welding, the factor that causes the quality of the weld.

 

Used round tube forming machines

 

Lap welding is an intermittent appearance, sometimes not, sometimes the length of the lap welding is slightly longer, a few centimeters or even tens of centimeters, and sometimes it is slightly shorter, ranging from one to two centimeters or less. Sometimes lap welding occurs regularly and equidistantly, and sometimes it appears irregularly. For these lap welding phenomena, we collectively refer to them as periodic lap welding. Periodic lap welding in used round tube forming machines generally occurs in the middle and late stages of production, mainly due to the following reasons:

 

(1) The guide ring is broken. When the closed pass is worn, the normal operation of the tube blank cannot be effectively controlled, and the tube blank can swing back and forth in the pass. At this time, after the guide ring ruptures and there is a gap, the edge of the tube blank will be compressed by the gap of the guide ring during the running process, thereby forming the generation of lap welded pipe. The characteristics of this lap welded pipe are the same length of lap welding cycle, strong regularity, and easier to judge. Generally, as the guide ring rotates after the rupture, the traces of compression can be found.

 

(2) Hole type wear. Mainly refers to the stepped shape at the bottom diameter of the upper roller of the closed hole type, and the stepped shape at the upper edge of the vertical roller hole type of the open hole type. When the blank tube slides to the part of the hole-shaped boss when it swings in the hole pattern, the blank tube will be deformed. The edges produce sag marks to form lap welding. Sliding in and out instantly makes the lap welding smaller, and vice versa. The best way to eliminate this kind of overlap welded pipe is to make reasonable adjustments during normal production to make the hole wear uniform and avoid stepped shapes. Once the irregular shape of the arc of the hole is found, it must be replaced in time. In order to completely eliminate the occurrence of lap welding.

 

Used round tube forming machines

 

(3) Foreign matter on the arc surface of the hole. Sometimes on the arc surface of the pass, other metal foreign bodies are adhered for some reason, which will cause the surface of the tube blank to appear indentation scars. When the adhesion position of this foreign body is in the trajectory of the edge of the tube blank , It will cause short and equidistant periodic lap welding. Under normal circumstances, this phenomenon rarely occurs.

 

(4) Swing seam. In the later stage of production, the pass wear is more serious, the ability to control the tube blank is gradually reduced, and the center position of each pass has been damaged to varying degrees. Therefore, from forming to welding, the phenomenon of unsteady running of the tube will appear. The lap welding caused by the swing seam is mostly caused by the vertical roller. The flat roller sometimes causes some lap welded pipes, but the probability is smaller in comparison. When inspecting the edge condition of the tube blank, it is also difficult to find any abnormalities and obvious depression defects. The height of the two edges of the tube blank is slightly different until the squeeze roll. At this time, attention should be paid to the shape of the upper edge of the vertical roll pass. If it is ideal, the shrinkage of the vertical roll can be increased to obtain a perfect tube blank edge deformation effect. If the upper edge of the vertical roll pass is not too good In good times, it is necessary to reduce the shrinkage of the vertical roll to prevent undesirable deformation.

 

Used round tube forming machines

 

(5) The bearing is damaged. After the closed-hole bearing is damaged, the smooth running of the tube billet cannot be controlled well, and the phenomenon of wobble seam is prone to occur, and the possibility of lap welding will follow. Especially after the bearing with multiple closed holes is damaged, the lap welding problem will be more serious. Of course, this phenomenon rarely occurs even if it happens. Adjustment will not solve the problem.

 

Due to the above 5 factors, the quality of the welding seam in the used round tube forming machines is caused by periodic lap welding. When the welded pipe is made, it is necessary to check whether the used round tube forming machines has these problems.

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In-depth Interpretation of Market Status
The current Used pipe welding machine market shows a "tripartite" pattern:

Japanese equipment accounts for about 35% (renowned for high precision)

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Among these, the three core competitive strengths of the Japanese 25 model Used pipe welding machine:

Precision retention: Maintains ±0.05mm machining accuracy even after 5 years of use

Energy efficiency: 18-22% more energy-efficient than comparable new domestic machines

Residual value rate: Retains over 40% residual value after 3 years of use

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High-precision forming system (7 horizontal rolls + 5 vertical rolls configuration)

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Online inspection system (equipped with CCD visual inspection)

Energy-saving transmission system (servo motor + frequency conversion control)

Industry Application Big Data
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Average production cost reduction: 42%

Production efficiency improvement: 28%

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Surface treatment compliance rate: 99.2%

Daily production capacity: Exceeds 5,000 linear meters

Product consistency deviation: <0.03mm

Procurement Decision Guide
Five critical dimensions to consider when purchasing Used pipe welding machines:

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Technical documentation completeness (must include complete maintenance records)

Supplier qualifications (prefer authorized service providers of Japanese brands)

Local service capabilities (service network with 2-hour response time)

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Second-hand equipment: Approximately ¥1.2 million

Annual cost savings: ¥760,000 (including energy, maintenance, etc.)

Payback period: 19 months

Future Development Trends
Intelligent retrofitting will become the value growth point for Used pipe welding machines:

Adding IoT modules for remote monitoring (increases value by 15%)

Upgrading automatic mold-changing systems (improves efficiency by 20%)

Retrofitting intelligent sorting devices (reduces labor costs by 30%)

Conclusion:
The Japanese 25 model Used pipe welding machine is redefining industry standards with its exceptional cost-performance ratio. For enterprises pursuing "lean production," this equipment not only significantly reduces initial investments but also delivers machining quality comparable to new machines. When procuring, companies should evaluate both the current condition of the equipment and its potential for upgrades to maximize investment value. During this critical period of manufacturing transformation, choosing high-value Used pipe welding machines is undoubtedly a wise decision for achieving "cost reduction and efficiency improvement."

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In-depth Interpretation of Market Status
The current Used pipe welding machine market shows a "tripartite" pattern:

Japanese equipment accounts for about 35% (renowned for high precision)

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Domestic equipment accounts for 40% (advantaged by pricing)

Among these, the three core competitive strengths of the Japanese 25 model Used pipe welding machine:

Precision retention: Maintains ±0.05mm machining accuracy even after 5 years of use

Energy efficiency: 18-22% more energy-efficient than comparable new domestic machines

Residual value rate: Retains over 40% residual value after 3 years of use

Core Technology Analysis
The four core systems of this Used pipe welding machine model:

High-precision forming system (7 horizontal rolls + 5 vertical rolls configuration)

Intelligent temperature-controlled welding system (±2°C precise temperature control)

Online inspection system (equipped with CCD visual inspection)

Energy-saving transmission system (servo motor + frequency conversion control)

Industry Application Big Data
In the automotive manufacturing sector:

Average production cost reduction: 42%

Production efficiency improvement: 28%

Defect rate reduction: Below 0.5%

In the architectural decoration sector:

Surface treatment compliance rate: 99.2%

Daily production capacity: Exceeds 5,000 linear meters

Product consistency deviation: <0.03mm

Procurement Decision Guide
Five critical dimensions to consider when purchasing Used pipe welding machines:

Equipment service years (recommend choosing machines under 5 years old)

Key component conditions (focus on high-frequency welding head wear)

Technical documentation completeness (must include complete maintenance records)

Supplier qualifications (prefer authorized service providers of Japanese brands)

Local service capabilities (service network with 2-hour response time)

Typical ROI Analysis
For a monthly production scale of 100,000 meters:

New machine investment: Approximately ¥2.8 million

Second-hand equipment: Approximately ¥1.2 million

Annual cost savings: ¥760,000 (including energy, maintenance, etc.)

Payback period: 19 months

Future Development Trends
Intelligent retrofitting will become the value growth point for Used pipe welding machines:

Adding IoT modules for remote monitoring (increases value by 15%)

Upgrading automatic mold-changing systems (improves efficiency by 20%)

Retrofitting intelligent sorting devices (reduces labor costs by 30%)

Conclusion:
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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.

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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

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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 
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Furuiwo Used 140 Pipe Welding Machine Unit: Cost-Effective Solution for Efficient Production

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

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Small cost replacement of 140 second-hand welded pipe equipment
Small cost replacement of 140 second-hand welded pipe equipment
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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 
Detail
Q: Why did you choose this refurbished 140 to 165 second-hand welded pipe equipment/used tube 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

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