> How much should I expect to pay for a reasonably competent TIG welder
> that'll run on a domestic 13A supply and weld 4mm alluminium?
> If indeed there is such a welder...
> Any suggestions / commendations?
What are you building ? Catamarans ?
First, you have to have a AC set, DC doesn't work on Ally.
is a pretty well entry
level SIP TIG set, and an indicative (very cheap for TIG) price. Think
upwards from there
The best stuff comes from Lincoln Electric, but you can see from the
rating that you need at least a 32A feed at full throttle. The guys who
do all our sheet metal I just spoke to, recommended 150 A for short
tacks and a 250A set, not for the section, but for the ruggedness of the
torch and cooling of the torch. A Water cooled torch is compulsory I
think at 250A in the weld.
That said, we welded 2" sections of 1/8" thick with 115-120 A. That
welder went on a 16A circuit (big blue plug), rather than a 32A (bigger
If you are welding at home, do you have three phase ? That will reduce
the current requirement from the supply considerably.