突合せ溶接における横曲り変形の発生過程

概要

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Processes of transverse angular distortion free from restraint and bending moment reacting to restraint of the distortion in bead-on-plate welding as well as in multi-layer groove welding of mild steel plate have been observed (Figs. 1,7 and 11). Thermal cycles at some points in welded region have been also recorded. The results are summarized as follows : Angular distortion and bending moment develop as the welded region cools from high temperatures, and then disappear when the distribution of temperatre becomes uniform across the thickness of weld, though the temperature of weld is still as high as 600°to 500℃ (Figs. 8,9,12,13 and 14). At cooling stage of first layer in groove welding, additional angular distortion and bending moment occur in the reverse direction to those of the normal ones. In progressive welding the shrinkage and angular distortion induced in welded region are unable to occur freely on account of the resistance of weld metal previously deposited, and finally residual bending moment, amount and direction of which vary along the seam, appears in the weldment (Figs. 5 and 6).
社団法人溶接学会の論文
1970-02-25