In TIG welding of Al-SiC composites, reduced mechanical properties and lesser weld penetrations are the commonly
observed problems. To overcome these challenges, Activated TIG (A-TIG) welding and pulsed current TIG (PCTIG) welding
techniques are being used. PCATIG welding is a combination of ATIG and PCTIG welding process. This approach of combined
mode of welding has the advantage of increased weld penetration and improved bending strength. Comparing the CCTIG, ATIG,
PCTIG and PCATIG welding conditions, the following results are observed. ATIG with SiO2 as flux (ATIG-SiO2) and ATIG with
TiO2 as flux (ATIG-TiO2) show positive effect of increased bending strength. The conditions ATIG-CaO, ATIG-MgO and ATIGMnO2 shows slight improvements with slight sacrifice in bending strength than the normal CCTIG welding. It is also observed
that the usage of Al2O3 as active flux coating in ATIG welding results in reduced bending strength.
