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Materials and Manufacturing Processes Volume 29, 2014 - Issue 8
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Effect of Traces of CO2 on Arc-Ultrasonic TIG-Welded MGH956 Alloy

Yu-cheng Lei School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China; Jiangsu Province Key Laboratory of High-End Structural Materials, Jiangsu University, Zhenjiang, ChinaCorrespondence[email protected]
,
Ya Luo School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
,
Chen-cheng Gong School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
&
Bo Xiao School of Materials Science and Engineering, Jiangsu University, Zhenjiang, China
Pages 1004-1010 | Received 11 Sep 2013, Accepted 26 Feb 2014, Published online: 18 Jul 2014
 
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Abstract

MGH956 alloy was arc-ultrasonic welded by tungsten insert gas (TIG) welding with 0.5% CO2 added in the shielding gas. The porosity and microstructure of the welds were investigated and the mechanism of traces of CO2 on MGH956 alloy TIG welding was analyzed. The results indicate that the interface between reinforcement phases and matrix is clean and they are firmly bonded with arc ultrasonic introduced. Based on the effects of arc ultrasonic, the segregation of reinforcement phases decreases, and they are uniformly distributed in the weld with 0.5% CO2 added in pure argon. The grains in the weld center are fine and equiaxed. The tensile strength and the toughness of the joint are improved.

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