Forgot to mention something (and this applies to ANY time you weld) ALWAYS make sure you're welding on bare metal (ie, make sure you get any rust, scale, pickling etc off before you strike an arc). You'll get a much better weld with less spatter and a better appearance. Also make sure that when you're working with thicker material (3/8" and up) that you prep your weld area first by filleting the weld surfaces so you get better penetration. You may not have to do this on bigger machines or areas where a convex weld doesn't make a difference to fit up but I didn't have either of those lol. Another thing to note is you may want to disconnect your battery or ECU if you're going to be doing a lot of welding. I installed a breaker a while back that makes this pretty easy to do but regardless, I've heard a handful of stories about welding on vehicles with everything hooked up and weird electrical gremlins starting shortly thereafter. I'm definitely not an EE but I'd rather be safe than sorry and it only takes a moment.