Impulsive High Current Density Spot Welding of Aluminum Alloy to Mild Steel (Report I) : Effect of Surface Treatment on Weldability

概要

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Effect of faying surface treatment on the tensile shear strength (TSS) of joints has been studied in the weld of aluminum alloy (0.8t 5052) to mild steel (0.8t SPCC) using uni-directional weld current from SPCC to 5052. Welded joints had 380 kg/spot TSS value under the condition of wire-brushing on both SPCC's and 5052's faying surfaces. Slightly reduced TSS value was obtained under the condition of wire-brushing on SPCC's surface alone. On the contrary, wire-brushing on 5052's faying surface alone, gave TSS values of merely about 100 kg/spot. Therefore, to give wire-brush or not on SPCC's faying surface before the weld affects strongly TSS values of joints. Further, peeled fracture surfaces of the joints were observed by scanning electron microscope and it was found that joints under SPCC wire-brushing showed a ductile deep dimple region while the others presented a relatively flat brittle face. The above mentioned results indicate that the surface treatment of metals with higher melting point is important in the welding of dissimilar metals.
社団法人溶接学会の論文
1984-10-01