Abstract
Friction stir welding (FSW) is a joining method which uses the frictional heat generation between a rotating tool and joining metals. Furthermore, cracks, residual stresses and distortions which are the problems of the conventional welding do not occur because FSW works in the solid state 1). Cobalt alloys which have high durability in high temperature are used for the FSW tool material when it is predicted breaking. However, Cobalt alloy tools were worn compared with steel tools in our previous study. Then we carried out reciprocating wear test as first stage and observed the under structure of wear scar using TEM to clear the wear mechanism of FSW tool alloy.
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