The problem is you have the cheapest lowest current flux core welder that is intended for light home and art welding projects. You NEED a MIG welder with shielding gas to do any sort or real autobody welding. Flux core welding is NOT a clean weld for the most part. On auto panels, they most likely will rust through soon after they are painted because of this. The entire purpose of flux core wire is to weld together steel that you cannot get clean enough to weld with MIG or TIG. I find it odd that you ask for welding advice yet you do not want to take it when people who know how to weld are giving you advice. This has nothing to do with being cheap or trying to save money. You are trying to do something with the wrong equipment. Go buy the cheapest Ebay 110v MIG welder and it will work fine when used with 75/25 shielding gas and solid wire. Also, for the welding lens, a shade 9 or 10 is fine for such low current. You need to see the welding puddle to know if you are welding correctly when you are learning.
