CO_2-O_2 アーク溶接法による鋼材溶接部の衝撃値(第 1 報) : リムド鋼溶接部の衝撃値におよぼす送給ガスの酸素混合率の影響

概要

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A rimmed steel (0.20% C, 0.01% Si, 0.49% Mn) was welded using CO_2-O_2 arc welding process with eight electrode wires. The silicon and manganese contents in each electrode wire were varied (0.33∿1.26% Si, 1.44∿0.90% Mn, respectly). Effects of chemical compositions of electrode wires and oxygen contents in supplied gas on V-notch Charpy impact values of weld metals were investigated and the following results were obtained : (1) Impact values of weld metals are generally increased with addition of oxygen to supplied gas, if electrode wires contain sufficient amounts of silicon and manganese. (2) Impact values of weld metals are high when silicon and manganese of electrode wires are contained in the field in which unsaturated silicate is produced by deoxidizing reaction with silicon and manganese in molten iron. But if electrode wires contain large amounts of non-metallic inclusions, the values are not always high, though their silicon and manganese contents may be the same as the above mentioned. (3) Therefore it is necessary to minimize the amounts of non-metallic inclusions of electrode wires as much as possible to increase the impact values of weld metals.
社団法人溶接学会の論文
1966-10-25