Changing to gas?

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Me again,I have searched but haven't found a complete answer. I am switching from .035 flux.core to .025 solid and probably 75/25 mix. 90% of my work is with 16 to 20 gauge for auto panels. I have the correct regulator and flow meter and am looking at one of the cylinders on ebay (20 cf) for less than $65.00. I have been told I will need to reverse the polarity on my machine. Does what I have said so far look OK? I sure would appreciate all comments and suggestions. I want to get this right the first time. The .035 does fair but wouldn't .025 and gas help?Thanks Ken
Reply:Kens1948Why are you switching to gas ("help"what)?  What type welder are you using?  How much welding will you do?  Do you have any ideas as to how long 20cf will last? I use both mig welder and wire feeder (Flux core).  My preference is flux core whenever cosmetics is not important or I know the weld will be ground away.  Keep spatter down with antispatter spray (the non-flammable type), nozzle dip.  I don't deal with auto panels, however.
Reply:The big trick welding car panels is to just tack. I mean lay a million tacks rather than a any welds, jumping from place to place to avoid heat build up and warping. Don't hold the grinder too long in one spot either because that alone can produce enough heat to warp the panel. Good luck
Reply:You do have to change the polarity. 75/25 is good. .025 is also good. 20cf will not last very long, although. I would take the advice of the other 2 guys. I do not weld very much with MIG, but do know that what I posted is right for switching to gas from flux.Last edited by orphan68; 11-19-2005 at 05:46 PM.
Reply:Thanks Guy's,I will take your advice on this. If I weld using the tacks  you suggested, it does work. The only thing is it takes so long but haste makes waste. I did fined out the grinder can generate a ton of heat in a short period. I have never used the anti-spatter spray but will pick up some next week. I did find that cleaning the heat selector switches helped a lot. They are push button set's, one button is high when up and low when down then there are three buttons for high, med and low for the main switch. The poteneiometer for the wire speed was flakey as well. I cleaned it and it works great now. If anyone has any more comments or suggestions, please jump in. I am pretty sure I can be a decent welder with the expert help I am getting here.My hats off to ALL of you.Ken
Reply:Kenwww.usaweld.com is the website for HTP welding equipment.  They have a really good catalog containing lots of body work tools.  It is worth checking out.