Different grades of Polypropylene copolymers being used for automotive interior applications have been evaluated for weldability of the vibration welding process. Vibration Amplitude (VA) and Melting Down Distance (MDD) are key process parameters of the vibration welding process and design consideration, while talc content, density, and melt flow rates are essential to influence material properties. Understanding of effects of both vibration amplitude and MDD will greatly help to optimize product design and increase manufacturing flexibility. DOE procedures to evaluate material weldability for the vibration welding process have been suggested by Park. In the same paper, how to define weldability for the material has been suggested. For more conclusive evaluation, both welding strength and failure modes of the welded plaques need to be investigated. Effects of the vibration amplitude and MDD on those key material properties have been studied by evaluating welding strength, elongation, and failure modes of welded plaques. Optimal vibration amplitudes associated with optimized melting down distances for all resins evaluated are provided in this paper.
展开▼
