“…Thus, the fatigue strength and weld ability as well as heat-resistance, anti-corrosiveness, and anti-abrasion are simultaneously and specially required for utilizing those friction-welded components of heat-resisting. Recently, there have been many reports [3][4][5][6][7] on the fatigue strength of steel and stainless steel and those of friction-welded joints as aging treated, in the case of which the nickel base alloys were friction welded and age-treated for creep tests.…”