层道排布对6005A铝合金MIG焊接头微观组织及力学性能的影响

doi:10.11896/cldb.21060094

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Abstract The effects of metal inert gas(MIG) welding layer and pass arrangements on the microstructure and mechanical properties of 6005A aluminum alloy joints were studied. High-quality butt joints were obtained with different welding layer arrangements, including two layer-two pass, two layer-three pass and three layer-three pass. The peak temperature of heat-affected zones (HAZ) was compared by welding thermal cycles, and the microstructure transformation in the heat-affected zones was studied by electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM). Moreover, the microhardness and tensile strength of welded joints were examined. The results indicate that the softening zone located in the HAZ is the weakest part of the 6005A aluminum alloy multi-layer and multi-pass MIG joint. Different microstructures and mechanical properties were obtained in the HAZ with different welding layer arrangements, through different welding thermal cycles. The rolled characteristic of grains was observed in incomplete recrystallization HAZ of the three-layer and three-pass welded joint, while equiaxed grains were obtained in the complete recrystallization HAZ of the two-layer and two-pass welded joint, and the recrystallization extent of grains in the HAZ of the two layer-three pass welded joint was between those of the three layer-three pass and two layer-two pass welded joints. Besides, the overaging of the HAZ strengthening phase β″ leads to joint softening. Among the three types of welding layer arrangements, the three-layer and three-pass welding joints has the lowest energy input and the shortest high-temperature residence time, resulting in the lowest degree of HAZ overaging as well as the lowest strength and hardness. In this case, the average tensile strength of three-layer and three-pass welding joints is 211 MPa, which is higher than that (183 MPa) of two-layer and two-pass welding joints and that (161 MPa) of two-layer and three-pass welding joints obviously.

Key words： 6005A aluminum alloy multi-layer and multi-pass welding layer arrangement precipitate joint softening

Published: 10 September 2022 Online: 2022-09-10

CLC number:

TG444+.7

Fund:National Natural Science Foundation of China (52005132) and the Natural Science Foundation of Shandong Province (ZR2019PEE038).

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	Articles by authors
	LI Shuaizhen
	HAN Xiaohui
	WU Laijun
	LIU Yuhang
	WANG Peng
	SONG Xiaoguo
	TAN Caiwang

Cite this article:

LI Shuaizhen,HAN Xiaohui,WU Laijun, et al. Effect of Layer Arrangement on Microstructure and Mechanical Properties of 6005A Aluminum Alloy MIG Joints[J]. Materials Reports, 2022, 36(17): 21060094-5.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21060094 OR http://www.mater-rep.com/EN/Y2022/V36/I17/21060094

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