Improvement of Resistance Spot Welding by Surfaces Treatment of AA1050 Sheets

Resistance spot welding (RSW) aluminum alloys has a major problem of inconsistent quality from weld to weld, because the problems non-uniform oxide layer. The high resistivity causes strong heat released which influence significantly on electrode lifetime and quality. Much effort been devoted experimentally study sheet surface characteristics for as-received pretreatment by pickling in NaOH glassblasted with three thicknesses (0.6, 1.0, 1.5 mm) AA1050. Three different process parameters energy setup as low, medium, were carried. Tensile-shear strength tests performed indicate Moreover, microhardness tests, macro/micrographs, andSEM/EDS examinations carried out analyze, compare, evaluate effect conditions weldability. received showed higher electrical contact resistance its thicker In contrast, glass-blasted lower value, since it roughest surface, leads easy breakdown highest average values least scattering maximum load fracture are treated bypickling NaOH, these 760, 1193, 2283 N 0.6, mm thickness respectively medium input energy. minimum 616, 1008, 2020 sheet. profiles fusion zone HAZ is than base metal all cases. Numerical simulation SORPAS® was used simulate optimize parameters, given good results prediction when they compared experiments.