Newbie Questions

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I am totally new to the welding scene but am very interested and would like to become more familiar with it.  I would like to purchase a mig welder in the near future.  I will be using the welder for mainly automotive chores (roll bars, exhuast piping, frame modifcations, etc.).  I just need to be steered into the right direction regarding the amount of amperage I need, do I need shielding gas, should I get 110v or 220v, and so on.  I would like to spend around $500.  Any help advise regarding which welder to get would be greatly appriciated.
Reply:Minimum, 220 volt machine, 175 amps with gas.MM 175 is a good starting point, but I'd suggest saving up a few bucks and going with a bigger machine since you say you want to do frames and roll bars.Appreciation Gains You Recognition-
Reply:i agree with franz, a 220v 175A would be a bare minimum, but will come in at $750, by the time you buy a tank of c25. This will be outstanding for everything you mentioned, except frame work which really needs a 200A class machine. I have a Hobart175, that was my first and favorite machine, and it will take you a long time to grow into its capabilities. Once you do, though, you will be quite irritated you didnt buy a bigger machine. Until that happens, though, you will have quite a bit of capacity for various welding project. Just know that there is a limit to what you can do with 175A.If we went to the welding store together, based on what you've said, we would be looking at a MillerMatic 210 ($1400 with a tank). The problem runs into a what 'can' the machine do in the hands of an experienced operator vs what 'should' you do with your skill level.