Effect of projection welding process parameters on the performance of SPC270C steel plate and weld nut

Abstract In this study, projection welding (PRW), one of the spot welding methods, was investigated and the effects of the welding parameters used in this method on the weld quality were evaluated. This study investigates the effects of the parameters on the weldability performance during the projection welding process of SPC270C steel cold rolled sheet and M6 weld nuts. Within the scope of the study, experimental welding processes were carried out on M6 projected nuts on 1.2 mm-thick low-carbon steel material with varying electrode force, current intensity, welding time, pre-squeeze time, and hold time. The mechanical strength of the weld cores of the samples obtained as a result of the experiments was evaluated, and the most suitable welding parameters were determined. The highest fracture load was obtained as 8870 N for the welding parameters of 2 ms welding time, 12.5 kA current, 3,000 N electrode force and 15 ms pre-squeeze time and hold time. The lowest fracture load was obtained as 3800 N for the welding parameters of 2 ms welding time, 10.5 kA current, 5,000 N electrode force and 15 ms pre-squeeze time and hold time.