용접변형의 고정도 예측을 위한 지배인자의 정당성 검증

초록

The legitimacy of dominating factor in the high accuracy prediction of welding distortion was investigatedfor butt welding and fillet welding. When out-of-plane distortion was measured by the experiment objectingto butt welding, if tack welding was easily performed, the position of a neutral axis was variously changedby the irregularity. Then, there have been a case that out-of-plane distortion was generated in the unexpected direction. This case should be especially noted. New model for the experiment was proposed so as to solve this problem. As it was elucidated by the case of fillet welding, it was verified that the analysis should be carried out with satisfying the yield condition (especially at high temperature above 700 degree Celsius) and with closely simulating the penetration shape (heat input in weld metal) in order to solve the proposition that is the high accuracy prediction of welding distortion. It was confirmed that residual stress is highly predicted because welding distortion is highly predicted, too.

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