looking to buy a welder - MIG Welding Forum

Looks a tidy enough job, the trailer.

You won't be able to use the Clarke 90 for stuff like trailers, it's more for thin bodywork metal, up to about 2 mm, which it's pretty good at.

You don't say what thickness trailer metal you'll be using, so perhaps angle at around 3-4 mm?

Migs aren't as powerful as arc welders for a given amperage, so you will be looking at a mig of at least 150 Amps for 3-4 mm, for the occasional build; but preferably around 180 Amp if you intend to be welding that thickness very often.

This makes it more difficult to select a mig welder, because the more powerful ones cost quite a bit more than your budget new, but you may come across one worth picking up s/h.

You could continue to use your arc welder on the heavier welds, and do the more cosmetic stuff with a mig. Keep the arc welder anyway, at least for now. If you want a heavy duty arc welder for making stuff, look out for an oil-cooled older welder, they often come up for sale, and if in good working order are well worth having. Even the 120 Amp ones will work flat out all day without cutting out. And usually within your budget.