Second, the ferrule is pressed into a ferrule grip that holds the ferrule in the proper position relative to the weld stud. There is a unique grip for each ferrule. Interested in more information about our process or products?Joe Quintiliani of Blasch Precision Ceramics demonstrates how quickly and easily Blasch one and two piece ferrules can be installed. The moisture content in the raw material is critical as it controls how well the material holds together during. Ceramic ferrules are disposable, refractory rings specifically engineered to shield the welding arc and mold the molten metal during drawn arc stud welding. Electrical Insulation Pros Ceramic ferrule excel at.