Usage of thermoplastic Olefin (TPO) is a common trend for automotive interior parts. TPO is a copolymer of Polypropylene (PP) and Polyethylene (PE) for rubber constituent and the TPO evaluated contains 20percent of talc. Considering the facts that PP and PE are semi-crystalline thermoplastics with high molecular weight and that TPO contains rubber, talc, and reground material, weldability of the material has been always in question. Especialy since the ultrasonic welding process depolys several tens of microns of vibration amplitude for welding, energy from ultrasonic vibration can be dissipated easily before effective heating of materials for welding. Therefore, evaluation of materila weldability is an important requirement for material selection.
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