極低温用 40% Ni 系溶接金属に関する研究(第 3 報) : TIG 溶接金属の靱性向上

概要

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In this report, an investigation was carried out on the effects of molybdenum and silicon contents on the notch toughness and tensile strength of 40% Ni-6%Mn-10%Cr type weld metal of multi-pass TIG welding. Main experimental results are as follows : (1) Molybdenum was effective to increase the tensile strength and 0.2% proof stress of all deposited metal, but charpy V-notch impact value at -196℃ decreased gradually when the molybdenum content in welding wire exceeded about 7 percent. (2) Silicon was found to play an important role to raise Charpy V-notch impact value at -196℃ when the silicon content was decreased from 0.24 percent to 0.01 percent. (3) It was confirmed that the distribution of carbides in heat affected zone of multi-pass weld metal was influenced by the content of silicon, and the fracture path and the dimple pattern of fracture surface of impact specimen corresponded to the distribution of carbides in weld metal.
社団法人溶接学会の論文
1980-05-05