guys that weld with c02/argon mix

thanks for all your help guys.. i called a locaal shop today and they told me they have 125cf and 150cf and they would sell me the 150cf for 225.00 not bad i guess and will refill or trade for 35.00 when the time comes...now i guess i need to go out and pick 1 up and a reg. for the tank...

now what do most of you set your reg. on ????does it change with metal thickness or wire??? like i said i have never used gas before so may sound like a crazy ??? but not crazy to me when i can save myself from being blown up ..lol or do you just have to get a feel for it??? thanks mike:D