Argon-arc welding for austenitic stainless steel using water cooling welding method

A technology of austenitic stainless steel and argon arc welding, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as large welding stress, coarse grains of weld metal, weakened corrosion resistance, etc., and achieve improved welding The effects of production efficiency, small welding residual stress, and fine metal grains

Inactive Publication Date: 2008-07-30
普瑞特机械制造股份有限公司
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AI Technical Summary

Problems solved by technology

This welding method has the following disadvantages: 1. The welding stress is large, and the surface deformation of the material is serious; 2. Once a Cr-poor area is formed at the weld, the corrosion resistance is weakened; 3. The weld metal grains are thick, and it is easy to form intergranular corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Pipe welding: (1) Butt the pipe sections to be welded and seal the two ends to leave water inlet and outlet. (2) Connect the water source to inject water into the weldment, and control the water flow after water injection. (3) Carry out filler welding and cover welding of the weld bead in sequence.

[0013] Plate welding: While one person is filling and covering the front weld seam, the other person impacts the back of the weld seam with cooling water and stays on the back of the weld seam for a few seconds, so that the front of the weld seam can reach below 60°C and reduce thermal stress. It will not cause wave deformation and twist deformation of the whole board after the water source is removed.

[0014] Key points of water-cooled welding process and precautions for operation:

[0015] (1) The welding current can be increased by 10% to 30% compared with ordinary welding.

[0016] (2) Due to the fast cooling rate, if the operation is improper, it is easy to produce...

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Abstract

The invention discloses a water-cooling argon-arc welding method for welding austenitic stainless steel, which is characterized in that: after finishing backing welding at the welding seam of a workpiece, the back of the welding seam is cooled with cold water when filling and cover-welding is carrying out for the welding seem. The invention solves the problems that high welding stress and poor corrosion resistance exist in the prior austenitic stainless steel welding and ensures that the welding seam of the austenitic stainless steel has fine metal crystal grains, uniform structure and small residual welding stress. The invention can not only obtain ideal welding joints but also improve the productive efficiency of welding.

Description

technical field [0001] The invention relates to a welding method for austenitic stainless steel materials, which is suitable for welding construction of austenitic stainless steel. Background technique [0002] In the domestic austenitic stainless steel plate and pipe welding, argon arc welding is mostly used now, and the protection measures are only protected by argon gas, and air-cooled welding is performed. This welding method has the following disadvantages: 1. The welding stress is large, and the surface deformation of the material is serious; 2. Once a Cr-poor area is formed at the weld, the corrosion resistance is weakened; 3. The weld metal grains are thick, and it is easy to form intergranular corrosion. The present invention solves the above problems. Contents of the invention [0003] The purpose of the present invention is to provide a welding method that can effectively improve the quality of welding products of austenitic stainless steel plates or pipes, es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23
Inventor 范伟国段言峰
Owner 普瑞特机械制造股份有限公司
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