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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.
Choosing which process to useâspot or projection weldingâdepends, like anything else, on the application. Fastener Welding Basics All resistance welding requires a balance of heat (current), time, and pressure. Current can be adjusted by a regulator, which changes the ratio of primary to secondary voltage.pot welding fasteners resistance-weld directly to a sheet with either a rocker-arm or a press-type resistance welding system (see Figure 1 and Figure 2). Projection fasteners, which have small protrusions on the surface that fuse to the base metal, require a press-type machine.