AlMg/6082异种铝合金脉冲MIG焊缝微观组织特征和力学性能

doi:10.11896/cldb.23120234

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (31954KB)
Export: BibTeX | EndNote (RIS)

Abstract The joining between AlMg cast aluminum and 6082-T6 aluminum alloy was conducted with pulse MIG welding technology. The mechanical properties, grain morphology, and fracture morphology of dissimilar aluminum alloy joints between AlMg cast aluminum and 6082-T6 aluminum alloy profiles were studied. The influence of microstructural evolution on mechanical properties was analyzed. The results shows that the maximum tensile load of the 6082/AlMg welded joint is up to 3 235 N, up to 85.5% of the load-bearing capacity of AlMg base material. The elongation is 8.2%, and the welding coefficient is approximately 0.8. The joints breaks in the AlMg base material and shows a ductile fracture. In the heat-affected zone on AlMg side, the lowest microhardness value is 77HV, with only a 7% decrease compared to the AlMg base metal. There is no significant softening observed, indicating a low sensitivity to the welding thermal cycle. However, the heat-affected zone of 6082-T6 side exhibits significant softening, with a 32% decrease in hardness relative to the base metal. This softening is attributed to the reduced density of β″ precipitates and the formation of larger β′ precipitates, which provided weaker strengthening effects. The weld zone, undergoes rapid cooling during welding, has an equiaxed dendritic cast structure with uneven solute distribution. Under the influence of the welding thermal cycle, the heat-affected zone on both sides of the joint shows varying degrees of grain growth. The AlMg side near the weld zone exhibits a 42.8% increase in grain size compared to the base metal.

Key words： AlMg cast aluminium MIG 6082-T6 dissimilar materials welding

Published: 25 May 2025 Online: 2025-05-13

CLC number:

TQ457

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LI Jia
	HUANG Li
	RAN Qihong
	GAO Feng

Cite this article:

LI Jia,HUANG Li,RAN Qihong, et al. Microstructure and Mechanical Properties of Pulse MIG Welded Joint of AlMg/6082 Dissimilar Aluminum Alloy[J]. Materials Reports, 2025, 39(10): 23120234-6.

URL:

https://www.mater-rep.com/EN/10.11896/cldb.23120234 OR https://www.mater-rep.com/EN/Y2025/V39/I10/23120234

1 Morita A. In:International Conference on Aluminum Alloys (ICAA6). Toyo hashi:Japan Institute of Light Metals, 1998, pp.25
2 Haber D. In:24^th Sae Brasil International Congress & Display. SAE International by Univ of California Berkeley, 2015, pp.36.
3 Abdullah A, Mohammed S K, Takhakh A M. Advances in Material Science and Manufacturing Engineering, DOI:10.1063/5.0117786.
4 Zhang L L, Wang X J, Liu X. Journal of Materials Engineering, 2018, 46(10), 55 (in Chinese).
张亮亮, 王希靖, 刘骁. 材料工程, 2018, 46(10), 55.
5 Zhang W K. Research on the mechanisms of thermal softening and strength recovery in fusion welded 6082-T6 alloy butt. Master’s Thesis, Hunan university, China, 2023 (in Chinese).
张文康. 6082-T6铝合金熔化焊接头热软化及焊后时效恢复机理研究. 硕士学位论文, 湖南大学, 2020.
6 Yang J, Oliveira J P, Li Y, et al. Journal of Materials Processing Technology, 2022, 301, 117443.
7 Qiao J Y, Shao Y F, Ruan Y, et al. Materials Reports, 2016, 24(24), 94 (in Chinese).
乔建毅, 邵有发, 阮野, 等. 材料导报, 2016, 24(24), 94.
8 Hu J Y, Liu Z Y, Li P Y, et al. Hot Working Technology, 2018, 47(19), 3 (in Chinese).
胡靖元, 刘志颖, 李培跃, 等. 热加工工艺, 2018, 47(19), 3.
9 Kang M, Sun W, Jiang P W. Nonferrous Metals Processing, 2020, 49(3), 23 (in Chinese).
康铭, 孙巍, 姜丕文. 有色金属加工, 2020, 49(3), 23.
10 Gao Q, Bai F, Ding H S, et al. Materials Reports, 2017, 31(11), 80 (in Chinese).
高倩, 白芳, 丁红胜, 等. 材料导报, 2017, 31(11), 80.
11 Ministry of Industry and Information Technology of the People’s Republic of China. Heat treatment of wrought aluminium and aluminium alloys:YS/T 591-2017, Standards Press of China, China, 2017( in Chinese).
中华人民共和国工业和信息化部. 变形铝及铝合金热处理规范:YS/T 591-2017, 中国标准出版社. 2017.
12 Granholt J D D A. Precipitate structure changes during overaging in an Al-Mg-Si alloy. Master’s Thesis, Norwegian University of Science and Technology, Norway, 2012.
13 Marioara C D, Andersen S J, Jansen J, et al. Acta Materialia, 2001, 49(2), 321.
14 Andersen S J, Zandbergen H W, Jansen J, et al. Acta Materialia, 2007, 46(2), 3283.
15 Yi J. The study of mechanical property and microstructure evolution of Al alloy weld in double-pulsed MIG welding. Master’s Thesis, Hunan university, China, 2015(in Chinese).
易杰. 铝合金双脉冲MIG焊接过程中焊缝组织和性能研究. 硕士学位论文, 湖南大学, 2015.
16 Wang P J, Chen K H, Jiang H L, et al. Materials Science and Engineering of Powder Metallurgy, 2016, 21(6), 8 (in Chinese).
王培吉, 陈康华, 姜慧丽, 等. 粉末冶金材料科学与工程, 2016, 21(6), 8.
17 Peng X Y, Cao X W, Duan Y L. The Chinese Journal of Nonferrous Metals, 2014, 24(4), 7 (in Chinese).
彭小燕, 曹晓武, 段雨露. 中国有色金属学报, 2014, 24(4), 7.
18 Ares A E, Gueijman S F, Caram R, et al. Journal of Crystal Growth, 2005, 275(1-2), 319.
19 Dubzik K. Journal of Kones Powertrain and Transport, 2010, 17(4), 137.
20 Huis M A V, Chen J H, Sluiter M H F, et al. Acta Materialia, 2007, 55(6), 2183.
21 He H, Li S K, Zhang L, et al. Journal of Plasticity Engineering, 2018, 25(1), 6(in Chinese).
何洪, 李世康, 张龙, 等. 塑性工程学报, 2018, 25(1), 6.