Welding questions

That first pic looks like a bubble gum welder to me. As far as settings for sheet metal there should be a list in inside cover for settings for what you are welding. Sheet metal can be frustrating as it burns holes quick. You have to stich weld it with short burst and spread out the spots you weld. You can't hold the trigger and burn like you can on thick steel. Get some scrap and get a feel for it and fine tune wire speed and have fun. :blob: