厚板 HT-80 鋼のサブマージアーク溶接の研究(第 1 報) : 溶接金属中の拡散性水素と各種われの関係について

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The transverse cracking in the submerged arc weld metal of HT-80 steels in heavy sections has become the object of increasing attention in the last few years. In order to make clear the relation between the transverse crack and the diffusible hydrogen in weld metals, a window type restraint weld cracking test and a restraint fillet weld cracking test have been performed in this investigation. It is shown that the combination of the highly basic agglomerated flux which generates plenty of CO_2 gas in welding and the wire which contains an adequate amount of alloying elements produces transverse crack-free weld metals. The main results obtained are summarized as follows; 1) The transverse crack observed in the multi-layer butt weld metal is formed in the region of the fusion line of final layer. 2) The diffusible hydrogen has a close relationship to the generation of transverse cracking. In addition, the interaction of oxygen and sulpher with hydrogen at the austenite grain boundaries has to be considered in regard to the cracking. 3) In the horizontal fillet weld joint, two kinds of transverse cracks are observed. One is a crack at the weld root and the other is a crack in the weld metal. 4) The transverse cracks generated in the multi-layer butt weld metal and the horizontal fillet weld metal are of the same kind. These cracks propagate along the austenite grain boundary. 5) The longitudinal crack observed in the horizontal fillet weld metal is a kind of hydrogen-induced crack which starts at the weld root. In the case of the weld metal with a low hydrogen content, this kind of cracks can be prevented by preheating or postheating, or otherwise by decreasing the strength of the weld metal.
社団法人溶接学会の論文
1973-04-25

厚板 HT-80 鋼のサブマージアーク溶接の研究(第 1 報) : 溶接金属中の拡散性水素と各種われの関係について

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