I got tired of lugging my welder everywhere, so I decided to build a cart. It didn't cost me one red cent, because I inherited all of the materials.
Photo 1: The cart I started with. A small shopping cart from a local store that just happened to show up in my parking lot at work one morning.
Photo 2: I measured the width of my welder, and cut that much out of the front of the cart.
Photo 3: I cut the back out of the cart to make room for the gas cylinder, but save the piece you cut out, becase you're gonna need it!