TIG welding - any experts?

I disagree about migs being unsuitable for thin gauge steel, a good quality industrial mig will weld very thin metal no problem as you have very fine adjustments on the panel.

My sip turbo mig on the other hand is the opposite, thin stuff is very difficult to do with it as it's a bit crude.

[yorkie_chris]

If you want to do TIG aluminium you need AC TIG, which is expensive.

Originally Posted by specialone

I disagree about migs being unsuitable for thin gauge steel, a good quality industrial mig will weld very thin metal no problem as you have very fine adjustments on the panel.

My sip turbo mig on the other hand is the opposite, thin stuff is very difficult to do with it as it's a bit crude.

+1

when i was researching to buy one that was the general consensus. Spend some money and buy one with as many power settings as possible.

Originally Posted by yorkie_chris

If you want to do TIG aluminium you need AC TIG, which is expensive.

Depends on the thickness as to whether you need ac or dc tig when welding Ali.

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Ac tig, cost a load of dosh for a decent one. Weld area needs to be as clean as poss, and will need a load more amps than what you would use on mild/stainless steel. I used to describe it as welding chewing gum
I have done everything from repairing ally road tanker chassis (shed loads of amps) to rebuilding the edges on outboard props(tiny amps!)... still hate the stuff! Lightweight mig's are ok for sticking ally together, but it doesn't penetrate anywhere near what a tig weld with the right amps would.
Never used a tig on dc for ally, or ever been asked to by any of the places I've worked
Main point to remember is that ally dissapates the heat from the ark very well, so it takes either more amps or a long wait for the weld pool heat to build, (or a quick blast with a heating torch to get things going quicker ) and when welding thin plate/pipe you dont get much in the way of visual warnings that it's about to go pete-tong resulting in an ally splat on the deck!

[NTECUK]

TIG welding is just wrong , we don't wright , right to left , so why weld that way?