There are two specific methods of stud welding: arc and capacitor discharge. Although they are relatively similar, each stud welding process is used for specific applications and requires unique fasteners. For more information regarding stud welding and our equipment, call 1-800-462-9353.
An arc stud welder should be used when one needs to weld a large diameter fastener to a rough and thick base metal. Although arc studs can come in a gamut of shapes, one end of the fastener must have a special tip designed specifically for arc stud welding.
Arc welding guns generally come equipped with a ceramic ferrule at the tip of the chuck so that the arc currents do not escape. You insert the fastener into the chuck and place it against the work piece. A lift mechanism in the gun gently lifts the stud and a secondary arc current is ignited between the work piece and the stud. The primary arc current is carried through the stud, melting both the tip of the stud and a portion of the work piece. The fastener is then pushed into the work metal, leaving a clean and strong weld once it cools.
A CD stud welder is preferred when one needs to weld small diameter stud to thin base metals. Since the CD stud welding cycle is much shorter than the arc stud welding cycle, welds do not leave any pronounced distortion, burn-through or discoloration on the other side of the work piece.
First, a stud is loaded into the CD stud welder gun and a voltage is chosen. One places the gun and stud onto the work piece as the capacitor battery charges to that specific voltage; this closes the circuit. After pressing the trigger, the current rapidly increases, thereby evaporating the ignition tip of the fastener and igniting the arc. As the stud and work piece are being melted, the stud is pushed towards the work piece and the molten areas are joined together. The fast CD stud welding process leaves a strong, clean weld.