Microstructural characterization of Friction stir assisted laminated lap welding of AA6063 sheets. (2022)

• Record Type: Journal Article
• Authors: Singh Rajawat, Manvendra; Pagrut, Shravan; Dwivedi, Suryank; Omprakash, ; Raj, Ratnesh; Rai Dixit, Amit
• Is Part Of: Materials today. Volume 56:Part 2(2022)
• Page Start: 949
• Page End: 953
• Publication Date: 2022
• Subjects: Friction stir welding -- Aluminium alloys -- Lap welding -- Microstructure -- Hardness -- Recrystallization; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.02.633
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Friction stir welding is a pioneering new technique for solid-state joining of Aluminium alloys, which also further strengthens the mechanical and microstructural properties of the base metal. Laminated lap welding on AA6063 sheets was performed using a stainless-steel tool with a square cross-section pin. The sample thus obtained was examined for their microstructural and hardness properties, and was characterized accordingly. Equiaxed grain structures are obtained commonly in friction stir welded samples. A refined grain size of ∼ 15 μm was observed in the microstructural characterization. The hardness profile depends on the degree of grain refinement as explained by the Hall-Petch effect. The microhardness was observed to be 135 % of the base metal hardness. The study has hinted towards the improvement of properties after friction stir lap welding and serves as a base for multilayer solid-state joining as a future prospect.