2219ミグ溶接継手における溶接割れと継手強度

概要

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Weldability of Al-Cu series alloy 2219 with MIG process was investigated in comparison with that of Al-Cu-Mg series alloys 2024. On weld cracking sensitivity, 2219 is superior to 2024 and as for the combination with filler metal, the decrease of Mg content in weld metal makes a crack resistance to increase. And a liquation cracking in heat affected zone was easily initiated in case of Mg contents more than 1.6 mass%and Cu/Mg(ratio in mass%) less than 1.8 in weld metal.Welded joints were mostly fractured in weld metal even reinforcement on during tensile testing, so the intensification of weld metal is directly connected with the improvement of joint strength and fractured mode. The results of investigation of correlation between the strength and chemical composition in weld metal revealed that the joint strength increased with an increase of magnesium and manganese but encouraged the weld cracking simultaneously. However the author has also found that silicon was available for decreasing weld crack and the possibility of consistence with joint strength and crack resistance by control of these contents of Mg,Mn and Si.
一般社団法人軽金属溶接協会の論文