高炭素鋼のガスシールドアーク溶接に関する研究(第 1 報) : 溶接金属の性質に及ぼすシールドガス組成の影響

概要

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Hot cracking susceptibility of weld metals by angle expanding type cracking test (gas mixture ratio; 0,20,40%), chemical compositions of weld metals by bead welding (0,10,20,30,40,50%) and mechanical properties, chemical compositions of weld metals by narrow gap butt welding (gap; 10mm, 0,20%) in the flat position and vertical position have been investigated for CO_2-O_2,Ar-CO_2,Ar-O_2 gas shielded arc welding of high carbon steel (0.65%C, 0.026%S). The results obtained are as follows : (1) Appropriate shielding gas composition concerning hot cracking susceptibility is CO_2+20% O_2. In case of Ar-CO_2,Ar-O_2 shielding gases, hot cracking susceptibility increase as increasing gas mixture ratio. (2) In case of bead welding, carbon contents of weld metals increase 0.24% to 0.34% as increasing gas mixture ratio. Contents of Si, Mn, Ti decrease as increasing gas mixture ratio. Decreasing tendency of these elements are in order of Ar-O_2,CO_2-O_2 and Ar-CO_2. Hot cracking are not recognized in the weld metals. (3) In case of narrow gap welding, weld metals with sound mechanical properties (tensile test, impact test) are obtained by CO_2+20%O_2. Carbon contents of weld metals for butt welding in the flat position are about 0.14-0.15% and for vertical welding are about 0.18% and hot cracking are not recognized in the weld metals.
社団法人溶接学会の論文
1983-01-05