高張力鋼のサブマージアーク溶接における溶接割れの研究(第 1 報) : 横割れについて

概要

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It has been well known that there often occur some kinds of hydrogen-induced cracking, such as transverse cracking and root cracking, in the submerged-arc welding of HT-80 steels. There have been many studies on them individually, but would be very few on all-round quantitative conditions to prevent them. Therefore, as the first stage, the prevention of the transverse cracking has been dealt with here. The conclusions obtained are as follows; 1) Experimental equations are proposed for preventing the transverse cracking as functions of Ceq of electrode wire or P_<CM> of weld metal, and diffusible hydrogen content and critical cooling time of weldment. 2) The residual stress may be ignored in the conditions for the prevention of the transverse cracking. 3) A new method for the transverse cracking test has been developed to conduct the experiment more easily.
1977-08-05