Welding Time Effect on Mechanical Properties in Resistance Spot Welding of S235JR(Cu) Steel Sheets Used in Railway Vehicles
N. Akkaşa, E. İlhan a, F. Varol b and S. Aslanlar c
aFaculty of Technical Education, Sakarya University, Sakarya, Turkey
bVocational School of Karasu, Sakarya University, Sakarya, Turkey
cFaculty of Technology, Sakarya University, Sakarya, Turkey
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In this paper, S235JR(Cu) steel sheets were welded by electrical resistance spot welding method. Their thickness was 2 mm and joints were prepared in overlap joint form. 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 periods 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 obtained welding joints were exposed to tensile-peel and tensile-shear tests. As a result of these experiments, the maximum tensile-shear and tensile-peel strength are obtained in 30 period welding time for 8.5 kA welding current.

DOI: 10.12693/APhysPolA.129.541
PACS numbers: 81.20.Vj