Aluminized Piping

[MrFriggsit]

I'm not sure you got the right gas for welding thin pipe. C25 was the right gas to ask for. Friggin salesman stuck you with something so he could make a sale. But now you might as well try it if you can't take it back.

[Broccoli1]

A jug of straight CO2 would have been just fine and cheaper

http://www.hobartwelders.com/om/0900/o925d_hob.pdf

Here is the Manual for the 140. Good info in it. Should answer all yer questions about settings.