反応性インサート材を用いた低電流での銅板の抵抗スポット溶接法

概要

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A reactive insert-assisted resistance spot welding technique is proposed for copper sheet joints. The technique enables use of conventional AC single-phase welders in resistance spot welding of copper sheets, since the low Joule heat due to the low electric resistivity of copper is complemented by the heat of reaction from the reactive inserts. Using elemental powder mixtures of titanium and aluminum as the reactive inserts, which show good combinations of tensile shear strength and bonded area, the effects of welding parameters on welded joints are investigated. Both tensile shear strength and bonded area increase with increasing welding current, while they saturate within 0.1 to 0.2 seconds' welding time. Since the reaction of the inserts is constrained by the applied pressure, an increase in welding force results in insufficient heating of welded points and thus leads to a decrease in tensile shear strength. When a welding current of 12 kA is applied for 0.5 s with a welding force of 0.98 kN, tensile shear strengths of 1.7 kN and 1.4 kN are achieved in a copper sheet of 1 mm thickness by Ti25 and Ti100 inserts, respectively.
一般社団法人日本機械学会の論文
1997-05-25