the best parameters for experiments are those which give
the widest range without any expulsion. It can be seen in Fig. 1
that a welding current of 7 kA gives the widest range of acceptable
welding time, and a welding time of 12 cycles, besides giving a wide
range of acceptable current, gives a weld nugget in a low welding
current. Therefore, 7 kA welding current and 12 cycles welding time
were chosen as fixed parameters for welding time and current varying,
respectively. Tables 2 and 3 present the welding parameters
used in this study.