Northland Fastening Systems is a complete supplier of tools, studs, accessories, and operations knowledge for CD, short cycle, and drawn arc stud welding. Whether you need a stud welding tool for rent or purchase, studs in custom or standardized dimensions, or even guidance from our expert technicians, you can count on NFS.
Stud welding is an operation heavily used across industries, but each type of stud welding technique requires an understanding of how the weld is generated and what tools and accessories are necessary for a successful result. An ideal stud weld point will be much stronger than the stud itself. That result can be tested in various ways with visual, tensile, and bend diagnostics.
While weld operations that achieve the best results possible may seem generally straightforward, they still require knowledge of how the weld is generated depending on welding type, calibrations for materials used, and accessories. For drawn arc stud welding, the understanding of what, why, how, and when ceramic ferrules are used is a critical part of performing a successful weld.
What are they?
Stud welding ferrules are rings made from refractory ceramic materials. They are protective shields for many operations, including drawn arc stud welding. They are also sometimes called ceramic arc shields, and they are made in a variety of shapes, sizes, and ceramic material specifications.
Why use them?
As a protective shield, ceramic ferrules are an important part of forming a clean, strong weld with drawn arc currents. Ferrules applied at the weld point will contain the pool of molten metal formed on the stud tip and welding surface. This creates a neat connection point. Ferrules are also important because they protect the weld point from the surrounding environment, preventing porosity in the weld from exposure to air, dust, gases, and UV light.
How do I use them?
Ceramic ferrules are attached around the stud tip on the welding gun. Place the correctly sized ferrule around the gun tip/stud by following the instructions specific to your tool model. After you complete the drawn arc stud welding cycle and the connection point has cooled, chip the ceramic ferrule away from the finished weld. Ceramic ferrules can only be used one time because they are broken in the removal process.
When do I use them?
While there are some rare times when ceramic ferrules are not used in the drawn arc stud welding process, you can almost always expect them to be a requirement for a successful weld. Though ferrules are used in (almost) every drawn arc stud weld, they are not used in CD stud welding or short cycle welding operations. Instead of a ferrule, other welding operations use shielding gas to protect and contain the weld point or don’t require either a ferrule or gas due to the small weld point.