| A study has made of residual stresses on the surface and characteristics of flash welded chain wish various steels. The measurement of residual stresses applied sectioning technique using electrical resistance strain gages. As a result of experiment, to product high grade chain, the alloying elements in steel must contain Ni, Cr and Mo, the conditions of heat treatment were oil quenching from 870℃ and tempering at 200℃. Distribution of residual stresses of welded chain was very complicate. Tangential residual stresses σ_T, appeared low valve, longitudinal residual stresses, σ_x, the more the distance from the weld line increase, the more tensile residual stresses increased and peak tensile residual stresses appeared about 2-2.5 times distance of heat affected zone from weld line and compressive residual stresses appeared at the bending region. Generally, the behavior of residual stresses of flash welded chain was affected by the deformation, yield stress, hardness and elongation of raw material. |
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