Abstract
Laser beam weldability of hard metals to steel was examined with high power (cw) CO 2 laser, (cw) Nd:YAG laser and (pw) Nd:YAG laser. Steel/hard metal joints, with 2.5 mm thickness, welded by the three laser systems, for comparison, will be presented. Two different hard metals compositions (K10 and K40) were examined. Power ( P), speed ( s) and vertical focal point position (f.p.p.) were investigated. To reduce the problem of porosity and crack formation in the hard metal, the parameter, t w, horizontal distance from the beam to the joint was also investigated. Weld bead size, microstructure, bending tests and hardness were evaluated.
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