I plan on using a 100A gasless mig welder to work on 2 - 3mm thick galvanized steel pipe and similar thickness sheet steel. I've read that 30A / mm thickness is a rough guide to a welder's potential. Is this accurate? Should I expect less performance given it is gasless? This is the welder I plan on...

After not welding for over 10 years (in high school) I’m planning on picking up the stick again. My workbench is all wood though (on rubber wheels) and I’m worried about 1) it catching fire, 2) problems connecting welding earth cable. The Bench https://i.imgur.com/ixDtYYd.jpg I’m considering somethi...