球殻構造における溶接変形の研究 : 第1報 : 貫通部材溶接時の溶接変形に関する実験的検討

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Welding deformations and reisdual stresses are major factors which control the collapse strength of externally pressurized vessels. Problems of circumferentially welded cylindrical shell and spherical shell welded along the equator have already been investigated by some of the authors^<1)2)>. There are many cases that a penetrator or a partial sphere is welded circumferentially to a spherical shell in actual structures. In this case, the spherical shell near the weld line and the penetrator tend to sink toward the center of spherical shell. Few researches on this problem, however, have been reported. In this report, the deformations of a spherical shell caused by the welding of penetrator or partial sphere are investigated. Experiments are carried out in order to clarify the characteristics of welding deformations and the effects of shell and penetrator dimensions and welding procedure on them. The results obtained in this research are as follows: The deformation in a spherical shell is mainly caused by welding thermal shrinkage. Its profile resembles to that in butt-welded cylindrical or spherical shell, and it is approximated by the deflection of spherical shell of which radial load is applied to the weld line. On that basis, two parameters which correlate dimensions and rigidity to welding deformations of spherical shell are proposed, and their effectiveness are confirmed by comparing with the experimental results.
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球殻構造における溶接変形の研究 : 第1報 : 貫通部材溶接時の溶接変形に関する実験的検討

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