A welder is an essential tool for completing serious bodywork projects. The most popular is a MIG welder for ease of use. MIG welding is commonly used for thin-steel body panels because the heat can be effectively controlled to prevent warping the panels. In addition, MIGs can weld aluminum and provide high-strength welds for frames, suspension, steering, and other parts. A welder is a handy item to have in your home shop, but make sure you have the proper safety equipment and know how to operate it. It is very easy to burn through sheetmetal with one. Operating a welder is a science and an art, and not something you proficiently learn in one day. So you may need instruction to learn how to effectively complete projects with it. If you need to learn how to weld, look for continuing education classes in your local school district or at a nearby community college. A perfectly formed bead is a wonderful thing and a skill well worth learning.