When using a drawn arc stud welding system, using either pitch diameter or full thread studs are the two most common options. There are some differences in the studs that are worth considering both for practical purposes as well as for performance.
In general, when using the drawn arc stud welding system, the studs will be larger than three-eights of an inch in diameter. Typically if there are over five eights of an inch, it will be important to consider using a heavy duty stud weld gun to deliver the power to provide a full melt and weld fillet in the fast welding process.
Full Thread
The fully threaded weld studs have the thread all the way up and down the length of the stud. Of course, there is no thread on the very base and the ignition tip. These are ideal to use in a wide variety of different applications. The mated piece of metal or other material can be of any thickness, and the thread will be available to tighten to the desired location for a secure hold.
Pitch Diameter
Unlike the full threaded weld studs, the pitch diameter weld studs have a base to the top of the ignition tip that is unthreaded. This is often the best option for fabricating or construction where there is a known thickness of material that will be affixed to the workpiece.
In most applications, the pitch diameter weld stud will have a higher shear value than a fully threaded stud of the same dimensions. This is because of the slightly larger base that can resist shear.
Other Options
There are several other options in fully threaded weld studs including hammer weld studs, which have a pronounced point for welding into dense, rusty or hard surfaces. These are used with specialized arc stud welders.
Custom options are available in threaded as well as non-threaded weld studs and are a must in many different applications.
