Abstract

High-performance polyamides (HPPA) matrix composite meets the demanding requirement of automotive thermal management applications as a replacement to conventional metals. Effective joining of such composites are still a challenge and a better understanding of material performance upon joining are needed. This research study investigates the behavior of glass filled semi-crystalline and partially aromatic polyamide composite upon ultrasonic plastic welding. Welding process parameters were experimentally realized for a quality weld in shear type joint configuration. A weld strength of 3.1 kN was achieved. Material performance, thermal transition, degradation temperature, mass loss and morphology near welding zone were evaluated by advanced characterization techniques. A decrease in glass transition temperature (Tg) and change in material crystallinity were observed. The morphology of welded interface reveals minimum void formation. Negligible amount of weight loss was observed after welding with a degradation temperature much higher than material melting point, suitable for high temperature applications.

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