MENU

/
/
China used pipe welding machines, the key technology for the production of precision welded pipes—Weld heat treatment

China used pipe welding machines, the key technology for the production of precision welded pipes—Weld heat treatment

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-01-02 11:30
  • Pvs:

【概要描述】China used pipe welding machines often consider many key technologies when producing precision welded pipes, such as ① quality requirements for raw materials. ② welded pipe forming process. ③ formation and removal of weld burrs. ④ weld heat treatment. ⑤ non-destructive testing. ⑥ correct Equipment requirements for welded pipe unit. For this reason, we introduce the  weld heat treatment to be considered in the production of precision welded pipes.

China used pipe welding machines, the key technology for the production of precision welded pipes—Weld heat treatment

【概要描述】China used pipe welding machines often consider many key technologies when producing precision welded pipes, such as ① quality requirements for raw materials. ② welded pipe forming process. ③ formation and removal of weld burrs. ④ weld heat treatment. ⑤ non-destructive testing. ⑥ correct Equipment requirements for welded pipe unit. For this reason, we introduce the  weld heat treatment to be considered in the production of precision welded pipes.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-01-02 11:30
  • Pvs:
Detail

China used pipe welding machines often consider many key technologies when producing precision welded pipes, such as ① quality requirements for raw materials. ② welded pipe forming process. ③ formation and removal of weld burrs. ④ weld heat treatment. ⑤ non-destructive testing. ⑥ correct Equipment requirements for welded pipe unit. For this reason, we introduce the  weld heat treatment to be considered in the production of precision welded pipes.

 

Precision welded pipes are more accurate in geometric dimensions than general welded pipes, and the welds and inner and outer surfaces are of good quality, and the wall thickness is uniform. It can be used in equipment components directly or with a small amount of processing. It is widely used in chemical, textile machinery, aviation, instrumentation, automotive and other sectors.

 

The welding process of high-frequency welded steel pipes in Chinese used pipe welding machines is carried out under the conditions of high heating speed and high cooling speed. The sharp temperature changes cause certain welding stress, and the structure of the weld seam also changes. Welding along the weld seam The structure in the central area is low-carbon martensite and a small area of free ferrite; the transition area is composed of ferrite and granular pearlite; and the parent structure is ferrite and pearlite. Therefore, the performance of the steel pipe is due to the difference between the metallographic microstructure of the weld and the parent body, which leads to an increase in the strength of the weld, while a decrease in the plasticity index, and the process performance deteriorates. In order to change the performance of the steel pipe, it is necessary to use heat treatment to eliminate the microstructure difference between the weld and the parent metal, refine the coarse grains, make the structure uniform, remove the stress generated during cold forming and welding, and ensure the quality of the weld and the quality of the steel pipe. Process and mechanical properties, and adapt it to the production requirements of the subsequent cold processing process.

 

China used pipe welding machines

 

There are generally two types of heat treatment processes for precision welded pipes of Chinese used pipe welding machines:

(1) Annealing: mainly to eliminate welding stress and work hardening, and improve the weld ductility of welded pipes. The heating temperature is below the phase transition point.

(2) Normalizing (normalizing treatment): It is mainly to improve the unevenness of the mechanical properties of the welded pipe, make the mechanical properties of the parent metal and the metal at the weld close, and improve the metal microstructure and refine the grain. The heating temperature is air-cooled at a certain point above the phase transition point.

 

According to the different use requirements of the precision welded pipe produced by the Chinese used pipe welding machines, it can be divided into weld heat treatment and overall heat treatment.

(1)Weld heat treatment: It can be divided into online heat treatment and offline heat treatment.

Weld heat treatment: After the steel pipe is welded, a set of intermediate frequency strip-shaped induction heating devices are used for heat treatment along the axial direction of the weld, and the diameter is directly sizing after air cooling and water cooling. This method only heats the weld area, does not involve the steel pipe matrix, and aims to improve the weld structure and eliminate welding stress, without the need to fix the heating furnace. The welding seam is heated under the rectangular sensor. The device is equipped with a temperature measuring device automatic tracking device. When the welding seam is deflected, it can automatically center and perform temperature compensation. It can also use the welding waste heat to save energy. Its biggest disadvantage is the heating zone. The temperature difference between and the non-heated zone will cause significant residual stress, and the operating line is longer.

 

China used pipe welding machines

 

China used pipe welding machines

 

(2)Overall heat treatment: it can be divided into online heat treatment and offline heat treatment

On-line heat treatment: After the steel pipe is welded, use two or more intermediate frequency ring-shaped induction heating devices to heat the whole pipe, heating to the normalized temperature of 900~920℃ in a short time, holding for a certain period of time, and air cooling to 400℃Normally cool down after the temperature is below, so that the whole tube organization is improved.

 

China used pipe welding machines

 

China used pipe welding machines

 

Part of the content of this site comes from the Internet. This site only provides information storage. The copyright belongs to the original author. It does not bear the relevant legal responsibility and does not represent the views and positions of this site. Please contact and delete it if there is any infringement.

关键词:

More News

The method of adjusting the concave surface when the galvanized pipe machine manufactures the square tube
The method of adjusting the concave surface when the galvanized pipe machine manufactures the square tube
When the galvanized pipe machines manufactures rectangular pipes, the pipe surface may be concave or convex. Concave surface classification is similar to convex surface.
Detail
When the galvanized pipe machines manufactures rectangular pipes, the pipe surface may be concave or convex. Concave surface classification is similar to convex surface.
Realize the overall heating treatment method of high frequency welded pipe equipment mechanism pipe welded pipe
Realize the overall heating treatment method of high frequency welded pipe equipment mechanism pipe welded pipe
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs.
Detail
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs.
On-line heat treatment method for high frequency welded pipe machine made pipe welds
On-line heat treatment method for high frequency welded pipe machine made pipe welds
The high frequency welded pipe machine HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
Detail
The high frequency welded pipe machine HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
High frequency welded pipe equipment to achieve seamless welded pipe
High frequency welded pipe equipment to achieve seamless welded pipe
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
Detail
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
Contact information
Tel: +86-13392281699
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province

Recommendation

Online Inquiry

留言应用名称:
底部留言
描述:

LINK

Contact Us

Tel (wechat): 13336487288
Wechat:+86 13336487288

WhatsApp:+86 13336487288
Email: zty@usedpipemill.com

Address: No. A99, Lecong Avenue East, Lecong Town, Foshan City, Guangdong Province

QRCODE

Copyright 0 2021 jinyujie. 粤ICP备13051810号 Powerby:  300.cn