Hi all. I'm having some trouble with my new tig welder. I'm new to tig so not entirely sure if it's me or the welder thats not working. Probably me. Anyway, I just bought a stahlwerk ac/dc 200 welder so I can weld my own stainless exhausts and aluminium intercooler pipes at home. But on practise on some aluminium, I can't get any kind of puddle going. Even if I amp it up. All it seems to do is make a really annoying squeaky noise and etch the metal, no matter what setting its on. I've looked through the forum and can't seem to find any similar problems, so I'm sure it's just me being stupid. Can anyone tell me what I'm doing wrong and point me in the right direction. anks