Effect of Welding Current on Mechanical Properties of Welding Joints in SPA-C Steel Sheets in Resistance Spot Welding

N. Akkas and E. Ilhan Sakarya University, Faculty of Technology, Department of Mechanical Engineering, 54187, Sakarya, Turkey

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This paper presents an experimental study on resistance spot welding of SPA-C steel sheets used in side wall and roof in rail vehicles. SPA-C steel sheets having 2.3 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 5, 10, 15, 20, 25, and 30 cycles and also welding currents were increased from 6 kA up to 14 kA by rise of 0.5 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.125.497 PACS numbers: 81.20.Vj