Fundamental Studies on Electron Beam Welding of Heat-resistant Superalloys for Nuclear Plants (Report I) : Effect of Welding Conditions on Some Characteristics of Weld Bead

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In this paper, the effect of the welding conditions on the characteristics of the weld geometry and the weld defects was made clear, concerning the heat-resistant superalloys for the nuclear plants. Obtained conclusion may be summarized as follows, using technical symbols which are given meanings in this report. 1) The weld defects were R-porosity and microcrack. 2) S_p and Δa_b are considered to be the important criteria for the evaluation of the susceptibility to the R-porosity. 3) Superalloys could be evaluated in the sensitivity to the microcrack in terms of the critical heat input to avoid microcrack q_<cr>. This q_<cr> is considered to be one of the proper criteria for evaluating the superalloys in the susceptibility to the microcrack. 4) Most microcracks were apt to occur when h_c/h_N came near to 1.0. These microcracks came to occur easily with the increase of d_<B・N>/d_B・
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