Research on the Welding Mechanism and Weld Characteristics of Different Transparent Plastics
Low melting point magnesium zinc alloy(MZA)powder near the plastic forming temperature is used as a laser absorber to achieve the welding of heterogeneous transparent plastics such as polyarylsulfone(PASF)and polycarbonate(PC).The interaction process between laser and MZA powder was tracked using Trace Pro software.Scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS)were used to explore the welding mechanism of heterogeneous transparent plastics.Finally,the effects of powder particle size,powder layer width,and thickness on welding strength and weld characteristics were investigated.The results indicate that the interaction between laser and MZA powder exhibits a composite reflection behavior and propagates forward along the gaps of metal particles;The welded joint is composed of a"pinned"structure and chemical bonding;In MZA powder with a particle size of 48 μ m.Under the condition of a powder layer width of 3 mm and a powder layer thickness of 0.08 mm,PASF/PC welded parts have the best welding effect.
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