Macrostructure and Shear Strength Analysis on Cu-Al Joint of Micro Friction Stir Spot Welding

Abstract

Efficiency energy is an importance goal in transportation device development. Reducing weight of device is a way to reduce fuel consumption from transportation device, using thin plat in a device or construction could reduce the weight. The originality of this study was Micro Dissimilar Friction Stir Spot welding used to join Cu and Al plate with copper sheet on top the aluminum sheet. Micro welding is a joining thin plat less than 1 mm welded by Friction Stir Spot welding which has been called a Micro Friction Stir Spot welding, using a Pin on the Shoulder. Peak load average, macrostructure and shear strength of a copper and aluminum sheet joint welded by Micro Friction Stir Spot welding were discussed in this study. Copper and Aluminum 0.5 mm could be successfully joined. Shoulder diameter 6 mm effected to the highest peak load, and welding force 50 kgf significantly increased the peak load. Mixing Cu and Al formed in a weld joint. Friction was not complete occurred in shoulder interface and deflection copper sheet formed in around weld nugget because of Pin and Shoulder. A Pin on Shoulder affect to form a joint only around Pin, shear strength could not conclude because the weld joint areas developing tend to an incomplete joining.