*Department of Machine Manufacturing Technology, Technical University "Gheorghe Asachi of Iasi-Romania, Blvd Dimitrie Mangeron, nr. 59 A, 700050
**Department of Electrical Engineering, Technical University "Gheorghe Asachi of Iasi-Romania, Blvd Dimitrie Mangeron, nr. 21- 23, 700050
***Department of Technologies and Equipments for Materials Processing, Technical University "Gheorghe Asachi of Iasi-Romania, Blvd Dimitrie Mangeron, nr. 21- 23, 700050
Online published on 7 November, 2013.
This work studies the influence sheet surface roughness on resistance spot welding (RSW) results. For the experimental research was used a S235JR (low carbon steel) sheet with 1 mm thickness. Were prepared 3 sets of different samples: a). Genuine steel sheet, b). steel sheet brushed c). sand blasted. The pieces were spot welded using the following parameters: the electrodes pressure constantly at 1.5kN, the welding time constantly at 6 cycles and the welding current was variable 5, 6 and 7 kA.
For pursuing the influence sheets surfaces conditions was measured roughness, electrical and mechanical resistance, for all three types of joints. Relationships were established between the three factors studied. It was observed that the higher roughness drives to the increasing of the contact resistance between pieces. Hence, the mechanical resistance was not raised simultaneous with the extension of roughness and contact resistance.
Resistance spot welding, surfaces conditions, roughness, contact resistance
