Abstract：The overlap joint, consisting of 6061 aluminum alloy which is 0.5mm thickness and T2 copper which is
2mm thickness, was welded in the micro friction stir welding process with zero tile angle. Meanwhile, the characterizations
of welding process were studied by analyzing the materials selection of welding tool, weld quality and mechanical properties.
Result showed that comparing to hot work die steel, welding tool made of high-speed tool steel had a longer working
life. As for the overlap joint of aluminum and copper, an excellent weld shape can be acquired through micro friction stir
welding with zero tile angle, moreover, the process window was wide, the mechanical properties of the joint are excellent,
and its load bearing capacity can be over 95% of that of the 6061 aluminum alloy. However when the welding speed was
200mm/min and the spindle speed over 25000r/min, the grooves defect appeared on the weld.
2017, 
