1997 年 15 巻 4 号 p. 607-614
Alloy tool steel is thought low weldability materials concerning conventional fusion welding process because of high carbon content. Electron beam welding process has the metallurgical advantage and it is likely to be able to apply to alloy tool steel.
In this research, the electron beam welding of alloy tool steel as SKS 93 in JIS G 4404 for thickness 16 mm, effects of process parameters and post heat treatment on weld properties have been investigated by observation of penetration shape and defects of welds, measurement of hardness, tensile, impact and EPMA tests.
Bead welding were investigated to select suitable welding conditions for prevent defects such as hot cracking and cold cracking and suitable welding conditions were selected. Butt welding were investigated to proper post heat treatment for mechanical properties. Proper post heat treatment were normalizing treatment such as 1113 K and 1133 K for holding time 45 min. Effective application can be expected of the electron beam welding process as a fusion welding process of alloy tool steel.