Arcs and sparks are commonly used to dramatically depict welding in television commercials, photographs and other images. But in resistance projection welding (RPW), such flashes of light indicate poor welding.
“That is done for effect only,” explains Allen M. Agin, the Midwest regional sales manager for Weld Systems Integrators Inc. “The sparks you see are molten material being thrown out of the weld area. ... You want to keep that expulsion to a minimum.”