Investigation of the effects of different patterns and weldingparameters on tensile strength in tail welding

Electric resistance spot welding is one of the important manufacturing processes for joining high-strength steels in the automotive industry body assembly. Resistance spot welding is preferred because of the small area under heat exposure, fast construction, reliability, visual inspection, automation of the welding machine, and easy accessibility of the electrodes to the workpieces. The quality and strength of the body are mainly defined by the quality of the weld. The most effective parameters in this process are current density, welding time, sheet thickness and material, electrode geometry, electrode strength and current transmission. The selection of welding parameters is very important to increase the weld strength. In this study, the effect of welding time on tensile strength was investigated in joining materials of different thicknesses in the resistance spot welding process. Steel sheet with thicknesses of 0.5, 0.7 and 0.8 mm was used to examine the effects of tensile strength. The steel sheets used in the study were joined by electrical resistance spot welding for 2, 4 and 6 seconds. Welding pattern was determined as 4 vertical rows of welds. As a result of the tensile test, the breaking loads of materials of different thicknesses welded with electrical resistance spot welding were investigated according to different welding times. As a result of the tests, it was determined that the highest tensile strength was seen in the test sample, which was welded with a thickness of 0.8 mm for 6 seconds. In the test results, it was determined that the lowest tensile strength was seen in the test sample, which was welded with a thickness of 0.7 mm for 2 seconds.