Patent ID: 9656345
Date: 2017-05-23
CPC Classifications: B23K,C22C,C23C

Claim:
1. A friction stir welding tool made of cemented carbide comprising WC grains in a binder phase, wherein said welding tool is completely coated with a surface coating consisting of a first surface coating and a second surface coating, the first surface coating being an inner layer selected from the group consisting of a Ti carbide layer, Ti nitride layer, Ti carbonitride layer, Ti oxicarbide layer, Ti oxicarbonitride layer, Zr carbide layer, Zr nitride layer, Zr carbonitride layer, Zr oxicarbide layer and Zr oxicarbonitride layer, and the second surface coating being an outer layer of Al 2 O 3 that has an average thickness of more than 5 μm, said cemented carbide including from 3 wt-% to 10 wt-% Ni, wherein said surface coating is a CVD coating.