Effect of Welding Current on Mechanical Properties of Welding Joints in S235JR(Cu) Steel Sheets in Resistance Spot Welding

N. Akkasa, F. Varolb, E. Ferikb, E. Ilhana, U. Ozsaracb and S. Aslanlarb aSakarya University, Faculty of Technology, Department of Mechanical Engineering, 54187, Sakarya, Turkey bSakarya University, Faculty of Technology, Department of Metallurgical and Materials Engineering, 54187, Sakarya, Turkey

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This paper presents an experimental study on resistance spot welding of S235JR(Cu) steel sheets used in side wall and roof in rail vehicles. S235JR(Cu) steel sheets having 2.0 mm thicknesses were joined by using resistance spot welding as lap joint. A timer and current controlled resistance spot welding machine having 120 kVA capacity and a pneumatic application mechanism with a single lever was used to prepare the specimens. Welding periods were chosen as 10, 15, 20, 25 and 30 cycles and also welding currents were increased from 6 kA up to 14 kA by rise of 1 kA. The electrode force was kept constant at 6 kN. The prepared welding specimens were exposed to tensile-shear and tensile-peel tests and the obtained results were supported by diagrams and, finally, appropriate welding parameters were advised to the users.

DOI: 10.12693/APhysPolA.125.500 PACS numbers: 81.20.Vj