Using CD Studs: The Basics

Stud welding is a particular process that should not be confused with other types of welding. It uses a specifically designed stud that is bonded to one surface of a metal workpiece. This is ideal for many applications as it leaves the other side of the workpiece smooth and unblemished while creating a strong, durable fastener.

CD studs are used with CD stud welding. The CD stands for capacitor discharge. The other option for this type of welding is called stud arc welding. While the processes are different, they do accomplish similar goals.

CD Stud Welding

In general, the CD studs are smaller in diameter than those used with arc stud welding. Most will be three-eighths of an inch or smaller in diameter. As they are smaller in diameter, they are most often used with thinner metal or sheet metal grade materials that could easily melt through to the opposite side using the arc stud welding process.

This is a quick process with the weld CD studs placed the surface. There is a slight nub on the bottom of the stud that holds the rest of the stud off the surface. When the trigger is pulled on the gun the heat from the capacitor discharge causes the nub on the weld stud base to melt and also to be forced down into the molten puddle created by the direct-current arc.

This is an incredible fast weld, with the entire weld time taking less than six milliseconds. An experienced operator can easily complete up to 20 welds per minute with accuracy and precision and with no visible signs of the process on the other side, even with thin metal sheets or parts.

It is important to understand the right studs to use for the specific application. As this method can be used to fasten different types of metals to a workpiece, there are more choices in studs for greater flexibility.

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