Effect of Compensating Gas Jet Impinging Molten Pool on Pulsed MIG High Speed Welding of Stainless Steel

doi:10.12141/j.issn.1000-565X.180658

Journal of South China University of Technology(Natural Science Edition)

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Effect of Compensating Gas Jet Impinging Molten Pool on Pulsed MIG High Speed Welding of Stainless Steel

DONG Changwen^1,2 JIN Li² XUE Jiaxiang^2†

1． School of Mechatronics Engineering，Guizhou Minzu University，Guiyang 550025，Guizhou，China; 2． School of Mechanical and Automotive Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China

Received:2019-01-10 Online:2019-04-25 Published:2019-03-01
Contact: 薛家祥(1962-)，男，教授，博士生导师，主要从事数字化弧焊电源的开发等研究． E-mail:mejiaxue@ scut.edu.cn
About author:董昌文(1976-)，男，博士，高级实验师，主要从事焊接设备及工艺研究． E-mail:dcwyesok@ sina． com
Supported by:
Supported by the National Natural Science Foundation of China(51875213)

Abstract

Abstract: A new idea of artificial interference in the movement of weld pool after welding was put forward to im- prove the welding speed of stainless steel and restrain the hump weld bead and undercut defects． Compensating gas jet was introduced to impact the high temperature unsettled weld pool，and the weld formation was improved by in- terfering pulsed MIG weld pool of stainless steel． A self-made pulsed MIG weld pool compensating gas jet test plat- form was used to test different welding speeds and different compensating gas jet flow rates with 304 stainless steel as welding workpiece under the same energy input． The results show that the welding speed can be increased by more than 2 times with the method of compensating gas jet，and the welding seam is straight，uniform and beautiful without hump and undercut defects． The cross-section analysis of welding seam shows that the adjustment rate of liquid metal accumulated in hump by this method reaches 78. 63%，and the thermal efficiency of base metal increa- ses to 74. 36%．

Key words: hump weld bead, compensating gas jet, movement of weld pool, adjustment rate of liquid metal

CLC Number:

DONG Changwen JIN Li XUE Jiaxiang. Effect of Compensating Gas Jet Impinging Molten Pool on Pulsed MIG High Speed Welding of Stainless Steel[J]. Journal of South China University of Technology(Natural Science Edition), doi: 10.12141/j.issn.1000-565X.180658.

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Effect of Compensating Gas Jet Impinging Molten Pool on Pulsed MIG High Speed Welding of Stainless Steel

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