what is the ferrule on stud welding
FERRULES NELSON STUD WELDING SPECIFICATION Ceramic ferrules are an essential part of the standard drawn arc stud welding process. They are designed to encircle the weld stud to protect the weld arc and limit it to a specific area of the base material. They also contain the molten weld metal and act as a mold to give a uniform shape to this metal, also called the weld flash. The term, weld flash, is used to distinguish the weld metal at the base of a stud from the weld by other arc welding processes, which is called weld fillet. Standard Ferrules