Some good advice and tips, thanks. (y)
I bought one of these, and it will weld 4mm with a 2.5 rod no problem. Could do even 6mm or 8mm with multiple passes. It's a DC machine so penetration depends which way you got it set up. Electrode positive - red to red - gives most penetration for whatever size rod you're using. Electrode negative - red to black - gives a softer arc, less penetration, so nicer for thin metal and filling. It's a hobby machine, remember, not a production welder. But well up to the job it was designed for. Nice soft arc, and easy to pick up from a scratch start. Sure is a lot lighter than carrying the old buzz-box about, especially up and down stairs! With a 3-year warranty this is a pretty good little welder for those home jobs. If you haven't welded before, be sure to watch some videos on YouTube before you start. Get a self-darkening helmet, the mask that comes with the welder is only good enough for someone watching you; it's always best to use both hands when welding, especially if you're a beginner. Oh, and Ragstaa, you can weld 2mm box with this real good, but get yourself some practice in first, and test your welds with a big hammer before you do proper stuff.
Hey for you experts, could I use this for 2mm thick square box sections. Total newbie to welding
80amps is only going to be any food for up to 2mm thick material. As for mig welders then 1amp for 1 thou of thickness (40 thou is 1mm so 40amps required).