RESISTANCE SPOT WELDING OF MAGNESIUM ALLOY AZ61

Abstract

Resistance spot welding (RSW) was used to weld Mg alloy AZ61A. To research weldability of this alloy many welding parameters, e.g. current, time, pressure, have been tried in wide range on the welding source DALEX PMS 11 – 4. Visual check was followed with metallography, tensile test etc. Some defects as solidification, liquation cracks, porosity were found. The creation of imperfections was found to be dependent on parameters, so finally optimized parameters were found. The best influence on weld integrity, i.e. weld w/o cracks, was to set cooling time directly after welding. For sheet metal of 1 mm optimum welding parameters were 8 kA, 100 ms, 9 kN and long cooling time. Another problem found, was limited lifetime of Cu electrodes, when in contact with Mg melt. This contamination damagedsurface quality of electrodes, further influencing weld quality. High enough electrode pressure can diminish this problem.

Recommended articles

EVALUATION OF HARDNESS CURVES OF MULTILAYER WELDS OF CREEP RESISTANT STEEL 1.6946 USING SAW METHOD TO THE “ULTRA” NARROW GAP

LUKAS HOLUB, JIRI DUNOVSKY, JAN SUCHANEK
Keywords: submerge arc welding | narrow gap | low alloysteel | hardness HV10 | turbine | ro

EXPERIMENTAL INVESTIGATION ON THE EFFECT OF INJECTING WATER TO THE AIR TO FUEL MIXTURE IN A SPARK IGNITION ENGINE

MARIO FARRUGIA, DANIEL BUSUTTIL
Keywords: thermal engineering | ignition internal combustion engines | mechatronics | automotive applications | water injection