The research on laser welding-riveting hybrid bonding of titanium alloy and carbon fiber reinforced composites. (November 2022)

• Record Type: Journal Article
• Authors: Wang, Hongyang; Dong, Yuan; Hu, Zhenshuai; Liu, Liming
• Is Part Of: Optics & laser technology. Volume 155(2022)
• Publication Date: 2022-11
• Subjects: Welding-riveting hybrid bonding -- TC4 titanium alloys -- CFRP -- DIC technology -- Fracture mode -- Interface -- Mechanical interlocking; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2022.108405
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: High-quality joint between TC4 and CFRP was achieved by using pulsed laser welding-riveting hybrid bonding technology. Mixed fracture modes of laser welding-riveting hybrid bonding joints were revealed. Compared with traditional riveting, the welding-riveting hybrid bonding structure had better integrity. The melting of the resin matrix under the action of the laser filled the assembly gap, and the joint had good sealing and integrity. Abstract: The Ti-6Al-4V (TC4) and Carbon Fiber Reinforced Polymer (CFRP) were joined by welding-riveting hybrid bonding process. In order to reduce the thermal damage of CFRP in the process and obtain high-quality joints, the stepped rivet was used and a pulsed laser beam was used as the welding source. The maximum tensile shear load of 8.5 kN was obtained by varying the laser beam power. The weld joints were all in the form of 'button fracture', and the characteristics of joints failure are discussed in detail through tensile results combined with Digital Image Correlation (DIC) technology. Microscopic analysis by EPMA and SEM showed the bonding mechanism of the joint. The joint was sealed to improve the corrosion resistance, and it has better performance. In addition to the weld seams formed by the rivet and TC4 sheet and the mechanical bonding of the rivet, TC4 sheet and CFRP sheet, the mechanical interlocking phenomenon formed by the penetration of the molten CFRP into the assembly gap could reduce stress concentration and improve the mechanical properties of joints. It can also improve the structural integrity and sealability. Moreover, the molten CFRP and TC4 formed a 2 μm mixing layer, which also played a role in mechanical bonding process.