Capacitor Discharge welding is cutting-edge technology in the field of welding. This method of welding joins pieces of metal with the help of a hard, solid bond using power from a bank of capacitors. It requires specially designed stud with a projection tip called projection weld studs.
Projection weld studs have a small extension on the surface that is used to weld to the base metal. This type requires a press-type machine. Projection weld studs typically produce a stronger and more precise weld than spot weld fasteners.
It is important to know in advance when and when not to use projection weld studs on any application.
If any of the parts are dirty with oil or dirt or any type of debris, it can significantly reduce the life of the projection tip. Some machines have a pre-weld option that burns this off before welding.
Projection welding typically produces a thicker weld since it carries more current. That means it is more advantages to be used on thicker metals. Since during this type of weld the temperature is much hotter, both the protrusion and the base metal will melt and fuse together.
Projection welding requires a lot of contact and pressure between the protrusion and the base metal. Weak or insufficient welds can occur without enough pressure. The position of the fasteners can create a strong weld or an incredibly weak weld.
Projection welding is sensitive to force from the collapse of the projection tips. This type of welding requires the fasteners to be aligned properly. improper alignment to part of the surface can cause the edges to splatter from overheating.
Choosing the type of weld often is determined by the available equipment. If a shop has a choice, then projection welding with projection weld studs usually will produce better results.
