Projection Welding - Facts and Fundamentals

摘要

A primer to familiarize yourself with this popular process, provided by Bill Brafford, site content expert, www.howtoresistanceweld.info. What is a Projection Weld? Projection welds developed via the resistance welding (RW) process use the design or shape of the part to make discreet individual-point contacts to concentrate the current during welding. In most applications, one of the workpiece surfaces features multiple, small, formed projections - round dimples, elongated ridges or rings, or the extended corners of weld nuts. When the mating parts come together, the projections concentrate the current flow and generate heat in these locations. The hot projections then collapse as the weld nugget forms.