Effects of oxide layer on adhesion and durability of titanium and transparent polyamide joint by laser joining

Abstract

A joint of titanium and transparent polyamide with desirable strength was achieved by laser joining. A maximum load capacity of 3400 N was obtained from a lap joining area of 25 × 25 mm2 at a laser power of 350 W and a travel speed of 4 mm/s. The effects of surface oxide layers with different thicknesses and stability were investigated. A joint with a thick oxide layer exhibited lower load capacity due to excessive thermal degradation of polyamide caused by heat buildup inside the thick thermal insulating oxide layer. With UV exposure, more pronounced reduction in joint strength was observed in the joint with the thick oxide layer. Cracking of the oxide layers was responsible for lower strength and expected to be a result of stress from polyamide contraction combining with internal stress of the oxide layer.

Evaluation of SFRP Lugs with SLM Bushing Load Capacity and Dependence of CZM Mode II Model Parameters on Embedded Elements Surface Roughness

“…A method for treating metal surfaces to enhance adhesion is chemical treatment [34,35]. The authors [36] showed that the thickness of the oxide layer significantly influences the mechanical characteristics of the bond. The titanium/polyamide bond with a thick oxide layer showed lower load capacity, and with UV irradiation, a more pronounced decrease in bond strength was observed.…”

Short Fiber-Reinforced Polymer Polyamide 6 Lugs and Selective Laser-Melted Ti-6Al-4V Bushing Contact Cohesive Zone Model Mode II Parameters’ Evaluation

“…A method for treating metal surfaces to enhance adhesion is chemical treatment [29,34]. The authors [35] showed that the thickness of the oxide layer significantly influences the mechanical characteristics of the bond. The titanium/polyamide bond with a thick oxide layer showed lower load capacity, and with UV irradiation, a more pronounced decrease in bond strength was observed.…”

Laser Ablation of Titanium Alloy (Ti64): Effects of Process Parameters on Performance of Laser Welded Ti64 – Polyamide 6.6 Joints.

“…Moreover, Chanthapan et.al. [29] investigated the effects of titanium oxide layer on the strength and durability of laser welded titanium polyamide joints. However, laser treatment of Ti64 prior to laser welding with polymers has been neglected in literature and the effects of laser pretreatment parameters on joint behaviors remain unclear.…”