Quote Originally Posted by mekanik View Post
.....i do believe the power supply is different(could be wrong here).
Yes, TIG and stick sources are generally constant current (CC), whereas MIG / MAG is constant voltage (CV). Your plan may work to some extent but I expect you may struggle to maintain a stable arc. MIG / MAG welders are pretty cheap, so you may be better just buying a pukka machine for that. A logical next step for your TIG equipment might be an AC source so that you can weld aluminium.