I always tig weld bronze, brass, copper, thin aluminum and thin stainless. I often tig weld cast iron with silicon bronze rods. I sometimes tig thin steel if there is no mig available. I tig thick stainless if I need to weld out of position, or if I want to fuseweld only. I prefer to weld thick stainless with a stick. Thick aluminum with a spool on gun or push-pull mig. I tig weld mild steel if looks are critical(bike parts).
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