STUDY THE EFFECT OF THE SPOTS DISTRIPUTION IN SPOT WELDING

Abstract

This research presented a study of tensile strength and toughness method of welding joints in spot welding of 0.5 mm thicknesses low carbon steel sheets (Grade 1.8969 S600MC). six specimens welding joints were subjected to tensile shear using a tensile test machine, and the effect of welding time, welding current and welding pitch was studies. Period of weld current, weld time, and welding pitch is 6 - 8 KA, 8 -10 cycle and 10 - 20 mm respectively was selected during the welding process. In this experiment increase in welding current and welding time, the joint strength and toughness of welding increase, and decrease in welding pitch, the joint of weld became strong against pullout failure mode. The optimum parameter for tensile shear test at welding current 8 KA, welding time 10 cycle and welding pitch 10 mm, the highest tensile strength and toughness 109.85 Mpa and 32.17 J respectively at weld current 8 KA, weld time 10 Cycle and weld pitch 20 mm. Finally, the comparison result shown the higher strength and toughness of joint spot welding sheet.