You really don't have to pre heat. You can achieve great penetration with gas.Crawla 4Runner said:ya i know about cleaning up rust and what not.... i didnt feel like putting alot of effort into this i just wanted to see how the gas worked and felt and i must say i like it alot.... gas doesn't penetrate as much but thats what preheating is for overall im very excited and i think it was well worth the investment to go with the gas....
You just want the gas as low as you can so you do not get any holes. Any more and you are just wasting...Just set the gas at about 15CFM and it should be fine. For the metal you're welding, I'd probably use 19-20V and around 220 FPM wire speed. Play with your setting as see what you can do. Have fun!
your moving to quick, slow your circles down and you'll be golden. Never be afraid to slow your movement down and let your weld penetrate longer.
been welding now for 2months or so and just picked up some 75%/25% argon/co2
I love how smooth gas runs compared to flux
this was done with semi-circles on a hobart 140 115v Machine