SPIN WELDING JOINT DESIGN GUIDELINES

Spin welding is a very aggressive process capable of welding materials that other processes like sonic welding would have a hard time welding. Utilizing spin welding hermetic seals can be obtained fairly easily and will provide repeatable robust part welding joints. Some key part design features are, having the welding area of the two parts being equal or greater to the wall thickness of the parts and having a proper part joint design.

Both parts must be concentric and must maintain there shape after the molding process to obtain a even spin weld. Parts that are out of round will result in excess flash being generated in those locations that are out of round. With applications that require a finish with minimal flash, the flash can be designed to go to specific location, that is not visible after the welding process is complete. This key design element is called a “Flash Trap”.