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What is stud welding ?Stud welding is a method of fastening metal to metal using only one side of the base material. It elminates drilling, punching, threading, gluing, riveting, screwing, or finishing. One of the benefits of stud welding is a real saving of time and therefore cost. There are two (2) main types of studwelding: Capacitor Discharge (CD) stud welding and Drawn Arc stud welding (ARC). During the CD process, the capacitors are charged to a setting that has been preset on the front of the power supply. The CD gun is loaded with a weld stud and pushed onto the base material under spring pressure. The tip of the gun touches the workpiece which closes the electircal circuit. Upon trigger from the CD gun the capacitors are emptied, the stud and workpiece surface from a molten material and solidfy together forming a solid weld. The welding time for CD studs is very rapid ( it takes approx 3ms for the weld to take place). During the ARC process, the stud touches the workpiece which closes the electrical circuit. Upon trigger, the ARC gun lifts the stud off the workpiece with the help of a solenoid (magnetic coil). The main arc is thus initiated between the workpiece and the tip of the ARC stud. As a result of this arc, both the base material and stud melt, this forms a molten material and they are forced back together under the pressure of the spring thus creating a weld. The weld pool solidifies and cools down. The welding time for ARC studs vary from as little as 5ms to as long as 990 ms for each stud.
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