Goplus 250 AMP MMA Welder 110V/220V ARC Welding Machine w/ Face Shield Expired

To the welding rod, for Mig, Tig, and Stick you can have both AC and DC type power outputs to the welding "end" and which type of output you get and affect your ability to get good results and use certain types of welding material, like a shit ton of multi-process welders do DC TIG, but AC is the better option for maximizing the quality of your welds and the types of materials you can TIG weld.

additionally, for those asking a few quick points:
-the amp draw at 110 and 220 is going to be roughly the same from your electrical system, the difference is the output amperage, which drastically effects your ability to weld thicker materials together, use thicker rods, weld quickly and put down consistent beads, etc.
-this is not for welds anyone is going to see, stick welding is not known for pretty, clean joints, it's almost entirely functional in use, so the tongue on your trailer snapped, your tractor snaped a spindle, a metal shelf snapped at a corner post, quick and dirty fix-it type situations, it does do the job, so I'm not knocking it as an option, it's just not something the arts and crafts crowd or someone wanting to start a business based on welding is probably going to want to use, it's nice to have on handy along with a generator for RV'ing, offroading, farming, etc. as it can provide a fix that will get you out of a bad situation and/or home.
-10% duty cycle suggests that out of an hour, you shouldn't use this for more than 6 minutes, see above about using it for quick tack welds, etc. 6 minutes is fine for that, not for building a trailer or sculpture

for $45, if you don't have space limitations, this is probably worth it even if it stays in a box in the back of your garage until you need it, cause that one time you do eventually use it, it would probably be worth the $45 instantly, but it's not going to be something you want to use as a primary tool more like a "break glass in case of" type tool

-side note, I am not a welder, but I work with a bunch of them, and am the buyer for the company and do the research and quoting for all the capital equipment purchases including welders, plasma cutters, etc. So, while I consider myself quite knowledgeable on the equipment side of things, that knowledge has not, thus far, been applied, so there may be things I do not know or that are wrong from a practical knowledge perspective.

what DC source are you plugging it into??

That's why when you take welding courses they want you to master stick welding first, it's an art. When I started welding we learned oxyacetylene welding first. I don't think most schools teach that anymore. Once you have stick welding down, MIG and TIG are a cake walk.