A286合金電子ビーム溶接継手の低温引張特性に関する塑性拘束の影響

概要

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Electron-beam welding (EBW) is judged to be a suitable welding method of alloy A286, which is an iron-base superalloy with difficult weldability. The strength of the weld of this alloy changes to be reduced by the weld heat input. However, in case of the joints with narrow weld bead, increase of the strength may be expected by the effect of plastic constraint, such as those produced by EBW. In order to clarify the welded joint geometries which are affected by plastic constraint, tensile tests with varing relative thicknesses were conducted at 293K, 77K and 4K. As a result, it was clarified that tensile strength of the joints with relative thickness less than 0.8 increased with the effect of plastic constraint, and the order of degree depending on temperature was such that 4K<77K<293K.
社団法人日本機械学会の論文
1996-01-25