In the this video, Rob will show you step by step how MIG weld your own welding cart. Welding cart ideas can expand as features are added to the cart itself. Most welding carts are composed of stainless steel metal and are easily moved from place to place with the installation of two sets of rubber wheels. Welding carts are capable of holding many tools, collectively weighing up to three or four times the cart's weight, according to All Terrain Carts, and can be useful for any number of projects.