ガス被包金属アーク熔接による鋼材熔接部の気孔生成について(第 1 報) : 窒素の影響

概要

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The object of this research is to clarify a relation between porosity of weld and volume percentage of nitrogen in the mixed gas supplied for shielding of arc and its neighborhood. Three kinds of mixed gas; CO_2-N_2,A-N_2 and O_2-N_2,were supplied. The results of experiments showed the following facts : 1. In the case of CO_2-N_2 arc welding, the weld metal becomes very porous regardless of content of deoxidizers in the base metal, when the volnme percentage of nitrogen in supplied gas is over the limit value, 4.5%. 2. Also in the case of A-N_2 arc welding this limit value is nearly the same. But the weld metal by A-N_2 arc welding has generally higher content of total nitrogen, including nitride, than that by CO_2-N_2 arc welding with the same mixed percentage of nitrogen. 3. The true partial pressure of nitrogen in arc atmosphere is deduced to be over about 0.1 atm., when a weld metal becomes porous. And the difference between the above "true" value, about 10%, and the "supplied" value, 4.5%, was discussed.
社団法人溶接学会の論文
1959-07-25