If you haven't already, check ebay, there is always heaps on australian ebay. Tho alot are in 'IC kits'. Failing that contact a bull-bar maker or repairer in your area, they should have a manderal bender and have a fk load of off cuts they sell for a decent price OR have the contacts that you can get bends from.
Seriously there is an absolute fk load of raw products out there probably in your local area, you just need to be smart, talk to people in the trades and get off the computer!! most trade companies DON'T have a website.
Yes TIG or MIG will weld it as long as they have AC (or reverse polarity for the mig).
I have ask tho, it seams unusual that your compressor housing is burnign a whole in the connecting material. What are you using? Silicon? PROPER 3+ ply? or cheap ebay crap? I got some ebay reduces a while back out of frustration finding any and they were crap. the fell appart after not much use. The industrial grade standards I also had along with the PWR replacements have lasted for years.
HTH