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Both-way stainless steel pipe welding method

A welding method and technology for stainless steel pipes, which are used in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problems of decreased mechanical properties of welds, influence of ferrite, and changes in properties of stainless steel, and improve Mechanical properties, reduce damage, improve the effect of welding

Active Publication Date: 2017-11-03
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the welding process, due to the high welding temperature, it is easy to affect the ferrite inside the stainless steel pipe, which will lead to changes in the properties of the stainless steel, resulting in a decrease in the mechanical properties of the weld, which cannot meet the application needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1. Perform the first welding on the welding place, use argon tungsten arc welding, use nitrogen as the back shielding gas, use a mixture of nitrogen and hydrogen as the front shielding gas, and the flow rate of the front shielding gas is 25L / min, The welding speed is 170mm / min, and the temperature at the welding place is controlled at 230°C. After the first welding is completed, continue to pass in the back protection gas until the temperature at the welding place drops to 170°C;

[0030] Step 2. Carry out the second welding on the welding place, adopt argon tungsten arc welding, use nitrogen as the back shielding gas, use a mixture of nitrogen and hydrogen as the front shielding gas, and the flow rate of the front shielding gas is 20L / min, The welding speed is 230mm / min, and the temperature at the welding place is controlled at 290°C. After the second welding is completed, continue to pass in the back protection gas until the temperature at the welding place drops ...

Embodiment 2

[0035] Step 1. Firstly weld the welding place for the first time, using argon tungsten arc welding, using nitrogen as the back shielding gas, using a mixture of nitrogen and hydrogen as the front shielding gas, and the flow rate of the front shielding gas is 20L / min, The welding speed is 150mm / min, and the temperature at the welding place is controlled at 200°C. After the first welding is completed, continue to pass in the back protection gas until the temperature at the welding place drops to 150°C;

[0036] Step 2. Carry out the second welding on the welding place, using argon tungsten arc welding, using nitrogen as the back shielding gas, using a mixture of nitrogen and hydrogen as the front shielding gas, and the flow rate of the front shielding gas is 18L / min, The welding speed is 200mm / min, and the temperature at the welding place is controlled at 280°C. After the second welding is completed, continue to pass in the back protection gas until the temperature at the welding...

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Abstract

The invention discloses a both-way stainless steel pipe welding method. The method comprises the steps that firstly, first-time welding is conducted, nitrogen and hydrogen mixed gas serves as front protection gas, the welding speed ranges from 150 mm / min to 170 mm / min, the temperature at the welding position is controlled to range from 200 DEG C to 230 DEG C, and after the process is finished, leading-in of back protection gas continues till the temperature at the welding position is lowered to 150-170 DEG C; secondly, second-time welding is conducted, nitrogen and hydrogen mixed gas serves as front protection gas, the welding speed ranges from 200 mm / min to 230 mm / min, the temperature at the welding position is controlled to range from 280 DEG C to 290 DEG C, and after the process is finished, leading-in of back protection gas continues till the temperature at the welding position is lowered to 270 DEG C; thirdly, third-time welding is conducted, and the temperature at the welding position is controlled to range from 270 DEG C to 273 DEG C; and fourthly, passivation treatment is conducted on the welding position. According to the both-way stainless steel pipe welding method, welding forming is improved, and damage to compositions of original materials at the welding position is reduced.

Description

technical field [0001] The invention relates to a two-way stainless steel pipe welding method. Background technique [0002] As one of the most common metal materials, stainless steel pipe is widely used in various occasions and various equipment. In practical applications, stainless steel pipes need to be welded. However, during the welding process, due to the high welding temperature, it is easy to affect the ferrite inside the stainless steel pipe, which will lead to changes in the properties of the stainless steel, resulting in a decrease in the mechanical properties of the weld, which cannot meet the application needs. Contents of the invention [0003] In view of the above technical problems, the present invention designs and develops a two-way stainless steel pipe welding method that can improve the forming effect and improve the mechanical properties. [0004] The technical scheme provided by the invention is: [0005] A two-way stainless steel pipe welding meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/02B23P15/00
CPCB23K9/0052B23K9/02B23K9/167B23K2103/05B23P15/00
Inventor 李宁李均分王奇苏志强
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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