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Stud welding
From GAWDAwiki
Stud welding is an arc welding process in which fusion is produced by heating with an electric arc drawn between a metal stud, or similar part, and the other workpiece, until the surfaces to be joined are properly heated. They are brought together under pressure.[1]
There are two main processes used for stud welding: drawn arc and CD stud welding.
Drawn Arc stud welding is used for studs between 1/8" and 1.5" using power sources from 100-3,000 Amps. The power sources can be either a rectifier type or built with an inverter-based technology.
The stud is applied with a stud gun that controls the process. The stud, which has a small aluminum ball in the end the be welded, is placed in the gun and the gun is pushed against the base material. When the trigger on the gun is pushed a pilot current flows through the stud and base material, the stud is lifted and an arc is established and full current is provided by the power source. The arc melts the end of the stud and a small area of the base material. After a preset time period 0.1-1.2 seconds the stud is plunged into the molten base material and a very strong bond is created when the material has solidified.
CD stud welding is used for smaller studs where structural strength is of less importance. The process is similar to the drawn arc process but the power source is basically a bank of capacitors that gets charged and the discharged through the stud/base.[2]
