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Effect of Cu-Ag-O Electrode on Resistance Spot Welding of Aluminum Alloy Sheets
Published September 26, 1995 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
The objective of this work is to evaluate Cu-0.1%Ag-0.01%O alloy electrode which has high conductivity and optimum heat resistance for resistance spot welding of Al-Mg and Al-Si-Mg alloy sheets. This electrode shows above 5 times longer welding life for lubricant coated Al-Mg alloy sheets on using single phase AC welding machine than that of Cu-1%Cr alloy electrode. Erosion, which was caused by melting of Cu-Al eutectic formed by diffusion of copper into picked-up aluminum on the tip, was controlled because of high conductivity of Cu-Ag-O electrode. Welding life was exceedingly improved by an acid cleaning of aluminum alloy sheets. On using DC welding machine, the positive polarity electrode was severely damaged by excess heating from Peltier effect.