Effect of Friction Stir Welding Parameters on Microstructure and Mechanical Properties of Dissimilar Joint Al Alloy to Stainless Steel

In this research, successfully joint of dissimilar 5050 Al alloy to 304stainless steel by friction Stir Welding (FSW) has been studied. In FSW many parameters on the microstructure and mechanical properties is effective. Therefore, to achieve the highest strength possible, the important process parameters such as tool rotational speed, feedrate tool offset and pin profile have been investigated. Considering the results of the mechanical properties, the best condition to obtain the highest strength in weld nugget was 80mm/min feedrate, 500rpm tool rotational speed, with a conical pin profile and 1.8mm tool offset respectivly. In this case the strength of the 94/203MPa is obtained that this value is equal to 97% strength aluminum alloy base metal.