Plastic Part Design For Ultrasonic Welding. There are a variety of joint designs possible each with specific features and advantages. A butt joint a step joint a tongue-and-groove joint and a shear joint.
Conventional plastic welding techniques such as ultrasonic and hot stamping on the other hand require contact with the outer surfaces of the parts being joined and this. Two categories for plastic parts. An energy director design is used with almost all ultrasonic welding plastic part designs except when the materials are semi-crystalline.
The size and rigidity of the parts.
One of the key factors to successful ultrasonic welding is good component design in particular the shape of the surfaces to be joined ie the joint design. DESIGN REQUIREMENTS Inserthole design will vary with each application but a sufficient volume of plastic must always be displaced to fill voids created by knurled and undercut areas of the insert. Energy Director Design. The main feature of this joint is a small 90 or 60 triangular-shaped ridge molded into one of the mating surfaces.