. Butt joint configuration was used. The welding was per-
formed with ESAB-ARISTO machine with a power rating of
450 W and the carriage is FRONIUS-FCU-4-RC were used. The
welding setup and gas mixer unit of WITT-GASTECHNIK is shown
in
Fig. 2
a and b. The CO
2
and Ar percentages vary from 0% to
100% and O
2
vary from 0% to 40%. For all set of welding, the gas