充填ワイヤの無被包アーク溶接に関する研究 : C-Cr-B-Fe 系溶着金属のガス含量と気孔生成に及ぼす C, Cr および B の影響

概要

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The authors have investigated the effect of C, Cr and B addition on the gas contents and the formation of blowholes in deposited metals by non shielded arc welding process with flux cored wire. Moreover, in this paper, they have theoretically discussed the phenomena of blowhole formation in the deposited metals of multicomponent system from a standpoint of chemical metallurgy. The results of this investigation are summarized as follows : (1) The contents of oxygen and nitrogen in the deposited metal are decreased by the increase of C and B therein, but increased by the increase of Cr. (2) The total volume of blowholes in deposited metal decreases with the increase of Cr and B, while the effect of C addition on the occurrence of blowholes is not so clear. (3) In explaining the mechanism of blowhole formation, it is easier to explain it by means of the product of activity of C and oxygen, α_C・α_O and activity of nitrogen, α_N than by means of the contents of oxygen and nitrogen. The blowhole formation in defosited metals which are fully deoxydized through B is more affected by α_N than α_C・α_O (4) The critical values of α_C・α_O and α_N for the blowhole formation are obtained as α_C・α_O≒2×(10)^<-3> and α_N≒4×(10)^<-2>.
社団法人溶接学会の論文
1969-10-25