非溶接部を有する異種材電子ビーム溶接継手の破壊特性

概要

論文の詳細を見る
Electron beam welding was used to weld a SUS 405 steel plate with A387 Gr. 22, A204 Gr. B and SS41 steel plates. Compact tension type specimens (0.6T-CT) with incomplete penetration notches were extracted from the electron beam welds. Fracture toughness tests were carried out at room temperature for the specimens in the as-welded and post-weld heat-treated (685℃×2, 4 and 8 hours) conditions. The welded joints of A387-SUS 405 and A204-SUS 405 gave higher fracture toughness when PWHT was applied. Those of SS41-SUS 405 gave lower fracture toughness when PWHT was applied. The fractographic and sectioning observation of specimens indicated that the fracture toughness of the welded dissimilar metal joints was affected by the crack path deflection caused by the heterogeneity of welds and ferrite bands. In the welded joint of A387-SUS 405, the crack propagated right through the weld metal which was tempered by PWHT. When a long time PWHT was applied, the crack deflected from the weld metal toward the ferrite band in both the welded joints of A204-SUS 405 and SS41-SUS 405.
社団法人日本材料学会の論文
1987-06-15