| 摘要 |
An improved, relatively permanent operating head for stud welding guns is provided which eliminates the need of ferrule replacement after each welding sequence, thereby greatly speeding up and facilitating the welding operation, and lowering the cost thereof. The head includes an elongated, metallic, notched, dielectric-covered ferrule surrounding the usual stud-conveying chuck provided with the gun, along with air cooling apparatus for directing circumferentially spaced air currents through and exteriorly of the permanent ferrule to extend the life thereof and minimize buildup of slag thereon. In preferred forms, an inner, electrically insulating phenolic sleeve is disposed between the chuck and ferrule, and the work end of the latter is coated with an initial layer of tungsten carbide and an outer layer of tantalum for maximum heat resistance and electrical insulation.
|
