Abstract
The effect of number of spots, spot spacing, squeezing force, welding current, weld time, overlapping length and sheet thickness on the tensile and shear strength of two similar galvanized steel sheets are investigated through experiments using RSM method and by using software. Similar sheets of galvanized steel sheets are made by resistance spot welding at different processing conditions and these joint populations were tested under lap-shear loading conditions. Specially fabricated fixture is used to load the lap shear specimen in the universal testing machine Regression analysis is done to obtain relationship between shear strength and selected parameters. The experimental results indicate that the failure loads of spot welds in lap-shear specimens increase when number of spot, squeezing force, welding current and sheet thickness increase for the given ranges
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