Nd:YAG Laser Welding between Ti and PET Using Pulse Shaping

PET-Ti composites have already been preliminarily used in the medical area due to the benefit of moderate biocompatibility of PET and the excellent mechanical properties of Ti. The connection of these materials always utilizes various technologies. Comparing to other methods, laser joining has the ability to achieve a clean weld and heat up materials in a spatially localized area only the material parts to be welded. This article describes how pulse shape, peak power and pulse-width affect the welding quality. And, make a conclusion that pulsed laser shapes, no matter with ramped-down waveform or ramped-up waveform, can be used to minimize the degradation of PET causes the decrease of gas bubbles that influence the bond strength and width.