Agree with the above. You can theoretically cut with any welder. The better question is it cost or time effective.
Wire feed welders are capable of cutting 1/8 or less sheet metal (1/4 if its a good quality 220v) if you crank them all the way up. This still burns wire and electricity, and inert gas if so equiped. These require you have an outlet and are not portable unless you have a good generator. Probably the worst option for cutting.
Arc / Stick welders can handle plate steel inches thick but it takes time and a lot of rod and can leave a massive electricity bill. These also require you have an outlet and are not portable unless you have a good generator. Not the best cutting welder put a usable one.
Oxy / Acetaline (or LP / propane) torches are better and more cost effective but still have consumables that are not cheap. LP / Propane burns cheaper and a bit slower than acetaline. MAPP gas can work as well and provides higher heat / faster cutting than LP / propane. All of these require proper tips / torch setup to the gas used.
Plasma cutters. These I have not used but do know that as long as you keep in the range of thickness they are designed for they provide a nice cut and are most time and cost effective. I have been told by a few welders that use them you can exceed the rated thickness by up to 50%. So if it is rated for 1/2 inch you could be able to burn through a 3/4 in plate but will have a very poor quality cut. I believe these also use electricity and inert gas. Someone with more experience with them will have to chime in here and confirm or deny this aspect. I do believe that they have portable options available you can find with some quick searching.
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