What Mig size for lots of 3/8 & some 1/2

[geezer]

Thinking about getting a mig for doing lots of 3/8 thick material and also will do some 1/2 inch stuff with it, currently have an AC buzz box for that size of material but want to switch over to mig. Question is: what are the upper limits for the 200 A and 250A mig machines (thickness wise). My average weld length is about 12 to 15 inches before I stop for a smoke or what ever, so duty cycle could also be an issue.

[performance]

Typically, you don't weld that thick of plate in one pass.

But I'd still recommend the I MIG 250 as it does hold the larger wire sizes and larger roll. 12-15 inches at a time is a quite short period of time for a MIG. Its much faster than stick. Duty cycle shouldn't even be an issue even for the I MIG 200, which will do the job as well, but only good for a 11 lb roll.

[WAYNESWORLD]

I would also recommend the larger unit if you are going to burn a lot of wire. The larger spools are more cost effective. I like to buy mine in 45#.
Wayne

[geezer]

I would also recommend the larger unit if you are going to burn a lot of wire. The larger spools are more cost effective. I like to buy mine in 45#.
Wayne

Upon reflection, I think you are right, 1/2 inch requires lots of heat for proper penetration, and I want a mig welder that will do that with ease, rather than pushing it near it's upper limit. I have had a Clarke 130 EN for years and it is great on sheet metal and stuff up to 1/8, tacking etc. but now I want something on the order of the imig 250 to replace the old buzz box (thunder bolt)which has seen lots of use and abuse.

[Titan winch]

The 250P is definately something you would be happy with if you plan on doing a lot of thicker material.
I have been playing around with the IMG 200 the last couple of days and i think for my own needs this is perfect , but you also need to keep in mind i rarely go over 1/4" thick . I did however try it on 1/2" and it impressed me ( Although admitedly this is not hard to do ) I am not sure i would choose the 200 if i was planning on doing mostly 1/2" . TheIMIG 250P withthe pulse feature would be a big plus .
Cheers