You might want to search a little more. Not sure if you're talking about seam welding but that is what it sounds like. To properly seam weld it takes quite a bit of work, and I'm not sure that it is something I would want to undertake unless I had a completely stripped shell on a rotisserie. As far as the equipment, I am still learning about what is acceptable for welds and what is not, but for something like unibody seam welding I would want at least a gas shielded mig welder. Again, the search button is very helpful on this forum. If you search the chassis subforum for seam welding you will get plenty of info.