809 多パスビード溶接部の溶接直後急冷法による残留応力改善(材料強度と構造設計)

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 this study, the water-shower cooling was applied to a surface of multi pass bead on plates. To verify the effectiveness of the water-shower cooling on the tensile residual stress reduction on the welded surfaces of the multi pass bead on plates, residual stresses of the plates manufactured with or without water-shower cooling were experimentally determined. Experimental results show that tensile residual stress was generated on the welded surface when the water-shower cooling was not applied. The highest value of the tensile residual stress was more than 300 MPa. The experimental results also show that the tensile residual stress was improved to compressive when the water-shower cooling was applied. The highest value of the compressive residual stress was 200 MPa. It can be concluded that the water-shower cooling is effective for reducing tensile residual stress in the multi pass bead on plates.
社団法人日本機械学会の論文
2007-09-28