厚板 HT-80 鋼のサブマージアーク溶接の研究(第 3 報) : 溶接金属のじん性に関する検討

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In the submerged arc welding of HT-80 steels, it has been the subject of intensive study to increase the toughness of the weld metal without decreasing the strength of it for long years. The relationship between the composition of flux and the toughness of the weld metal has been studied in this investigation. In addition, in order to make clear the cause of embrittlement occurring in the weld metal by stress relief treatment, X-ray diffraction analysis and electron microscopic observation on carbides precipitated in the weld metal have been carried out. This paper shows that the combination of highly basic agglomerated flux and the wire containing adequate amounts of manganese and silicon can yield weld metal with high toughness and stress relief embrittlement can be prevented by the chemical composition of weld metal. The main results obtained arc as follows; (1) In order to increase the toughness of the weld metal, it is effective to decrease oxygen in the weld metal and for it to increase the basicity of slag. (2) Particular range of manganese to silicon which yields highly tough weld metal exists only in the weld metal produced by highly basic flux. (3) Stress relief embrittlement may occur at temperatures from 350 to 300℃ during cooling process. (4) The main reason of stress relief embrittlement is considered to be precipitation of complex molybdenum-carbides. (5) Stress relief embrittlement can be prevented by the selection of contents of C, Cr and Mo in the weld metal.
社団法人溶接学会の論文
1973-08-25

厚板 HT-80 鋼のサブマージアーク溶接の研究(第 3 報) : 溶接金属のじん性に関する検討

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