surely a Tig welding tip is going to heat up the parent metal in a smaller area quicker and so cooling quicker giving a different grain affect in the metal .I`m not doubting you can work the stuff on an english wheel afterwards with tig,just with gas the metal is softer??surely tig has to have different qualities……….or there wouldn`t be any gas alloy welders charging £50 an hour,they still use gas on the Astons at the factory,tig (IMHO) is easier to weld aluminium,so why bother training people to gas weld unless it has certain qualities that can`t be obtained with Tig.Your spot on with taking the weld back to the same guage as the parent metal,some very odd deformations i must say.
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