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GMA Spot Welding of A7075-T651/AZ31B Dissimilar Alloys using Stainless Steel Filler

M., Ishak and M. Rafiqul, Islam and Toshiyuki, Sawa (2014) GMA Spot Welding of A7075-T651/AZ31B Dissimilar Alloys using Stainless Steel Filler. Materials and Manufacturing Processes, 29 (8). pp. 980-987. ISSN 1042-6914 (print), 1532-2475 (online)

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Abstract

The aim of this research was to investigate the welding joint's fracture toughness and fracture surface morphologies between A7075-T651 aluminum and AZ31B magnesium dissimilar alloys welded using a new technique of gas metal arc spot lap welding with unconventional ER308L-Si stainless steel filler. The fracture toughness of the welding joints was estimated from yield strength and absorbed charpy impact energy of the joints using Rolfe-Novak-Barsom correlation, and was compared with the fracture toughness of AZ31B parent metal. Fracture surface morphologies were investigated by scanning electron microscopy. The results showed that the joint can achieve a maximum fracture toughness of 93.08% of the AZ31B parent metal. Most of the joints failed at AZ31B alloy, while some failed at A7075-T651 alloy and ER308L-Si nugget. Brittle fracture mechanism was observed for all the joints. It was found that the new gas metal arc spot lap welding technique with ER308L-Si filler could offer very good mechanical properties.

Item Type: Article
Uncontrolled Keywords: A7075-T651; AZ31B; Dissimilar; Fracture; GMA; Spot; Toughness; Welding
Subjects: Q Science > Q Science (General)
T Technology > TS Manufactures
T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Dr Mahadzir Ishak @ Muhammad
Date Deposited: 05 Mar 2014 01:27
Last Modified: 29 Nov 2018 07:24
URI: http://umpir.ump.edu.my/id/eprint/5109
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