低温用鋼材の CO_2-O_2 アーク溶接について(第 1 報) : 溶接鋼の熱間割れ

概要

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The present investigation was undertaken to find out the effect of nickel, manganese, sulphur and phosphor contents of weld metals of low nickel alloyed steels for low temperature service on their susceptibility to hot cracking, when welding was performed with various electrodes by CO_2-O_2 arc process. The following results were obtained : (1) Nickel and sulphur contents of weld metals have a very noticeable effect on their hot cracking. Particularly, even with the same sulphur content, hot cracking tendency of weld metals containing more than 2.50% nickel is much higher than that of those containing below 2.50% nickel. (2) It is necessary to keep the combined sulphur-phosphor content below 0.020% in order to prevent the hot cracking of weld metal containing 2.50 to 3.50% nickel. (3) Judging from distribution of concentration by X-ray microanalyzer, it is deduced that nickel concentration reduces in the grain boundary near hot cracks, but inversely sulphur concentration remarkably increases. Manganese concentration shows the same tendency as sulphur concentration, but phosphor concentration does not especially show any remarkable changes of concentration in the grain boundary near hot cracks.
社団法人溶接学会の論文
1966-10-25