723 水急冷による引張残留応力低減溶接方法の施工条件の最適化

概要

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To reduce tensile residual stress in a welded region, a new cooling method-which rapidly applies a water shower behind the welding-torch-was developed. In the case of applying this method to the welding of austenitic stainless-steel, the welding and cooling conditions are the parameters for reducing the residual stress efficiently. To optimize these conditions, first, the effects of the parameters on residual stress were determined by FEM. Second, the optimized conditions were determined by using the FEM results and a robust design technique. To confirm the accuracy of the optimized conditions, residual stresses under optimized or non-optimized conditions were experimentally measured. Under the non-optimized conditions, it was found that the residual stresses were tensile. On the other hand, under the optimized conditions, all residual stresses were compressive. These measurements results agree well with the FEM analytical ones; thus it can be concluded that the optimized conditions to reduce tensile residual are valid.
社団法人日本機械学会の論文
2003-03-13