Abstract
When friction welding is actually applied to parts of a machine, its mechanical strength is an important problem. Results of tensile and bending test have ever been reported, however, those of impact and fatigue test are seldom reported yet. S 20 C and S 45 C are tested on tensile, bending, fatigue and impact strength, and showed result as follows :(1)Tensile testBoth as welded and normalized material after welding are broken at the points that are not welded, therefore their strength is equal to that of base metal.(2)Bending testWelded material is sometimes broken at weld interface even when welded on conditions which it stands in tensile test, however such a phenomenon will not happen when welding conditions are properly decided.(3)Fatigue testBoth smooth and notched testpiece as welded, was increased fatigue strength by friction welding, and normalized testpiece after friction welding is equal to that of base metal.(4)Impact testImpact strength became much smaller by friction welding.After all, except the decrease of impact strength, the strength of friction welded carbon steel is almost equal to that of normalized carbon steel.
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