There are two different options to consider when in the market for a threaded stud welder. These two options include CD (Capacitor Discharge) or ARC (Drawn Arc). While they are often used for very different types of applications, typically with the drawn arc used for larger projects, there can be considerable overlap making both choices possible for many general applications.
To help determine the best option in a threaded stud welder for any application, there will be specific differences to consider both in the materials as well as in the type of weld needed.
Capacitor Discharge Welding
This is a very fast welding process with a weld formed in 0.01 seconds. It is generally used for thinner base materials as there is limited heat to create any types of burns or marring on either side of the metal.
It is used for smaller diameter studs and can be used with stainless, mild steels and aluminum studs. It can also be used with different alloys as well, but this is not common for general applications. The studs have a slight projection, which is sometimes called an ignition tip, which allows for uniform melting and welding time with each weld.
Drawn Arc Welding
Typically, drawn arc welding is used on the larger diameter studs and heavier workpieces. It is also a good option for a threaded stud welder when the base metal is dirty or has other surface imperfections. The drawn arc weld should also be used when the structure of the weld is critical.
When welding occurs using the drawn arc process, the weld is leak and corrosion resistant. This type of welding process is typically used on heavy duty equipment, vehicle manufacturing, ships, manufacturing equipment, and systems, in power generation facilities and systems as well as in electronic and electrical compartments and enclosures.