Chapter 5. Effect of Welding Parameters on Mechanical Properties of Dissimilar Friction Stir Lap Welds of AA5052 and AISI 1010

L. TUFARO; H. G.. SVOBODA

2ND INTERNATIONAL CONFERENCE ON ADVANCED JOINING PROCESSES (AJP 2021)

Springer International Publishing

Año: 2022; p. 71 - 83

Friction stir lap welding (FSLW) is a solid-state welding process which allows joining of similar anddissimilar materials. Welding of dissimilar materials involving aluminium alloys and steels are a current requirement for several industries, mainly for automotive and transportation. Al/steel joints presents several challenges, due to its different physical properties and the formation of intermetallic compounds. FSLW is a particularly interesting welding technique for these joints, especially for thin sheets. Nevertheless, there is lack of information about its application. The welding parameters affect the microstructural evolution, the material flow, defects level, distortions, etc. The aim of this work is to analyse the effect of the travel speed on the mechanical properties of friction stir lap welds of AA5052 aluminium alloy and AISI 1010 low carbon steel in thin sheets (1 and 0.8 mm, respectively). Dissimilar friction stir lap welds of these materials were produced using a tool made of H13 tool steel. Diverse travel speeds were analysed (98, 146 and 206 mm/min). Macrostructure examination, microhardness profiles and maps were performed in the weld cross section. Lap shear tests were conducted, and the fracture surfaces of tested samples were analysed. The maximum load per width unit increased linearly with travel speed, reaching 190 N/mm and a joint efficiency of 73%, and is controlled by the amount of steel inclusions in thealuminium plate through, which decreases with travel speed.