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A: I would like to answer your question as a general discussion of flux-cored welding. The American Welding Society (AWS) classifies all tubular electrodes having a flux on the inside as flux-cored wires, and calls it the Flux Cored Arc Welding (FCAW) process. All flux-cored wires have some similar characteristics. These include forming a protective slag over the weld, use a drag angle technique, have the ability to weld out-of-position or flat and horizontal only at higher deposition rates (depending on type of wire), ability to handle contaminants on the plate, etc.
Projection welding is very easy to maintain if the fundamentals are taken into consideration in the first place. Steel wire shopping carts, wire racks, and other crosswire products are all projection welding. Nuts and bolts are often assemble to other metal parts by projection welding. If you want to produce a part with very little heat surface marks on one side of the panel, then processing a projection on the alternate part and using large electrodes contoured to the finished part would facilitate the goal.