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Welding heat cycle of high frequency welded pipe equipment

Welding heat cycle of high frequency welded pipe equipment

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  • Release time:2022-05-12 11:30
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【概要描述】The welding thermal cycle of high frequency welded pipe equipment refers to the process in which the temperature of a certain point on the edge of the tube blank changes with time under the action of the heat source generated by the high-frequency welding current.

Welding heat cycle of high frequency welded pipe equipment

【概要描述】The welding thermal cycle of high frequency welded pipe equipment refers to the process in which the temperature of a certain point on the edge of the tube blank changes with time under the action of the heat source generated by the high-frequency welding current.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-05-12 11:30
  • Pvs:
Detail

The welding thermal cycle of high frequency welded pipe equipment refers to the process in which the temperature of a certain point on the edge of the tube blank changes with time under the action of the heat source generated by the high-frequency welding current.

 

The welding thermal cycle reflects the thermal effect of the welding heat source on the weld and nearby metals, resulting in different microstructure and performance changes; at the same time, it also provides information for finding the best welding process, improving the weld structure by technological means, and predicting the weld stress. way.

 

Factors affecting the welding thermal cycle of high frequency welded pipe equipment include: ① Welding process and line energy. ②Welded pipe specifications. ③Induction coil and magnetic rod. ④ The forming quality of the forming tube blank. ⑤ Opening angle.

 

High frequency welded pipe equipment

 

(1) Welding process and line energy. Under the premise that other conditions are constant and the input welding heat (power) remains unchanged, the welding speed is fast, the heating time is short, the heating width is narrow, and the cooling is fast; when the welding speed is slow, the opposite is true. These factors reflecting the welding process can be used with the help of Quantitative description of the welding heat input in the unit length of the weld - line energy:

 

High frequency welded pipe equipment

 

Formula:

q=line energy, J/mm;

I=welding current, A;

U=welding voltage, V;

v=welding speed, mm/s

 

The line energy can comprehensively reflect the effect of welding current, welding voltage, welding speed, extrusion force, welded pipe type, running quality and other aspects on the welding seam. When the line energy increases, the heat-affected zone becomes wider, the heating time becomes longer, the oxidation area at the edge of the tube blank becomes wider, and the cooling strength increases, all of which are harmful to the quality of the weld; similarly, when the welding line energy decreases, the heating range And the heat affected zone is narrowed and the heating time is shortened, which also affects the quality of the weld.

 

(2) Specifications of welded pipes. An important feature of high-frequency welding current is the skin effect and uses the tube blank as a loop. When the tube to be welded is large and thick, the longer loop and the longer heat transfer path consume energy and cause other problems in the tube. Partial heating, although these are necessary, but based on the welding seam welding has no practical significance, and lead to increased line energy, affecting the thermal cycle.

 

(3) Induction coil and magnetic rod. The induction coil and the welded pipe are tightly coupled, that is, the gap between the induction coil and the welded pipe is small and the number of turns is matched. Active power of line energy. The function of the magnet bar is to gather as much induced current as possible to the two edges of the tube blank to be welded, so as to improve the efficiency of welding energy. In this way, only seemingly low, but active, line energy is required to complete the welding. On the contrary, if the induction coil is large, the magnetic rod is small and the magnetic permeability is low, it will lead to high frequency welded pipe equipment and more welding current will be lost in the pipe body, and less current will converge to the edge to be welded, resulting in Although the line energy is large, the actual energy used for welding is not much, which affects the thermal cycle of the tube body.

 

High frequency welded pipe equipment

 

(4) The forming quality of the forming tube blank. High-quality formed tube blanks can ensure that the edges to be welded are butted in parallel, so that high-quality welding can be achieved only with low line energy. If the edges to be welded are in a V-shaped butt, the awkward shape of the two open corners inside and outside will have to make the welding heat higher and lower, and the thermal cycle curve of the welded pipe will change accordingly.

 

(5) Opening angle. If the opening angle is large, the proximity effect of high-frequency current is weak, the time for the tube blank to reach the welding temperature will be longer, the heating area will be wider, and the line energy will increase; on the contrary, the opening angle will be small, the current proximity effect will be strong, and the heating area of ​​the butt welding edge will be narrow. Less line energy is required, which in turn changes the thermal cycle of the welded pipe.

 

In addition, the welding extrusion force, the chemical composition of the tube blank, etc., will have an impact on the actual effect of the line energy and the welding thermal cycle. Therefore, according to the above information, check whether the high frequency welded pipe equipment has those problems that affect the welding thermal cycle.

 

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Appearance and performance

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After-sales service

Reputable suppliers like Jinyujie Electromechanical provide installation, spare parts support and technical training to reduce operational risks.

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Regular lubrication and inspection of key components to prevent rust and damage.

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Procurement risks

Verify equipment sources and clarify responsibilities through formal agreements.

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Match production needs with equipment specifications

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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.

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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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Processing Speed: 60 meters/minute, significantly improving efficiency while reducing energy consumption.

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Market Advantages: Economic and Environmental Value
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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.”

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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
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Small cost replacement of 140 second-hand welded pipe equipment
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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



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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.
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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.

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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

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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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