using a small welder for a small trailer build
I went with a 110v welder for the sheer fact that a I do not have access to 220v, I built my entire welder with flux core wire and I have ZERO worries of it falling apart, I've welded long enough to know better.
I put my frame attachment assemblies (frame strengtheners/extension/spring hangers) for mounting a Dexter 3500lb axle (with heavier, longer springs) in place of the old 1.25 square-tube axle of unknown weight rating, together with a 110v Northern Tool 125 flux-core welder. I had bought a Northern Tool 220v stick-welder, but never even plugged it in, when an electrician said I couldn't power it properly with my garages' 40 amp 220v circuit. I needed to do my project immediately, so I bought the 110v machine, to attempt it. I practiced for a while, using this machine, after sporadic, sometimes not good experiences trying my friends 220v Miller mig, at his shop (on my trailer, when he/I welded initial frame mods). When I began the project, I took lots of time on the assemblies, beveling, grinding down, filling, testing, over and over 'til I was satisfied with them. Then I had a very experienced welder inspect them at work. I asked if they were good to go, or if he could improve on them with the big welder in his shop. He said he could find no flaws. Coloration showed good penetration, too. Even so, I used Grade 8 hardware to doubly-attach the hangers to the rail, anyhow! I was surprised that my little welder would go far past its' stated duty cycle, and could really heat the 1/4" steel (I didn't expect that, as the info given said max 3/16").
welded frame attachment/spring hanger assembly
Northern Tool 125 flux-core (110v)
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Northern Tool stick-welder (220v)
Anyway, after using my little welder, I haven't used it but for a couple or items since. The assemblies I made for the trailer have worked for many miles, showing no flaws even after a near catastrophic "trailer airborne" event on the road (I inspected it with a magnifying glass, later). I would like to eventually try the 220v welder, and put a trailer together from scratch, but if one is really diligent about the details, and take extra time, a household current welder can build a frame (especially if using 3/16" or thinner steel).