Partial penetration welding of 5A06 aluminum alloy with high power fiber laser

CHEN Genyu; LI Changzou; ZHOU Cong; ZHANG Yan; XIA Hailong

doi:10.7510/jgjs.issn.1001-3806.2016.01.004

In order to solve the problems such as the control of welding penetration, the loss of alloy element and weld surface quality in the process of partial penetration welding of 5A06 aluminum alloy with high power fiber laser, the effects of welding speed, defocusing amount, and lap plate gap on the quality of weld surface were studied by changing one of the welding parameters at fixed laser power and positive welding protective gas. The distribution rule of magnesium element was analyzed theoretically and verified experimentally. The test results show that weld hardness is consistent with the distribution of magnesium element. Due to the common effect of grain refinement and magnesium element diffusion of parent metal, the hardness near fusion line is greater than the other parts. The strength of laser partial penetration welding joint with optimized parameters is greater than the strength of arc riveting joint. When the clearance is 0.2mm, the strength of laser welding joint is highest and can reach 68.1% of the tensile strength of the parent material. The results are helpful to guide the partial penetration laser welding of aluminum alloy.

Partial penetration welding of 5A06 aluminum alloy with high power fiber laser

1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;

2. Institute for Laser Research, Hunan University, Changsha 410082, China

Received Date: 2014-12-17

Accepted Date: 2015-01-28

Available Online: 2016-01-25

Abstract: In order to solve the problems such as the control of welding penetration, the loss of alloy element and weld surface quality in the process of partial penetration welding of 5A06 aluminum alloy with high power fiber laser, the effects of welding speed, defocusing amount, and lap plate gap on the quality of weld surface were studied by changing one of the welding parameters at fixed laser power and positive welding protective gas. The distribution rule of magnesium element was analyzed theoretically and verified experimentally. The test results show that weld hardness is consistent with the distribution of magnesium element. Due to the common effect of grain refinement and magnesium element diffusion of parent metal, the hardness near fusion line is greater than the other parts. The strength of laser partial penetration welding joint with optimized parameters is greater than the strength of arc riveting joint. When the clearance is 0.2mm, the strength of laser welding joint is highest and can reach 68.1% of the tensile strength of the parent material. The results are helpful to guide the partial penetration laser welding of aluminum alloy.

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Reference (15)

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Partial penetration welding of 5A06 aluminum alloy with high power fiber laser

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通讯作者: 陈斌, bchen63@163.com

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