Abstract
Joining fiber reinforced polyether ether ketone resin matrix composite (PEEK-CFRP) with Ti-6Al-4V titanium alloy to form a composite structure is a promising manufacturing process. Huge difference of material properties is the biggies challenge to join them. Continuous laser welding process is conducted in this experiment to join the two materials. In this study, joints under different welding speeds were obtained. Mechanical properties and microstructures were observed, and the interfacial structures were tested. The results showed that fixed joint could be obtained. As the welding speed decreased, the tensile shear first increased and then decreased. The shear force reached a maximum value of 36.8 N/mm at the speed of 10 mm/s. The quality of joint could be observably affected by welding speed. The formation of bubbles, cracks, and anchor effect at the interface were the main factors affecting the mechanical property of joint. Thus, adhesion failure was the main failure form for CFRP fracture. Ti, Al and some other elements had been diffused across the interface, resulting in the formation of intermediate transition layer. The result of EDS, X-ray and XPS test indicated that CTi0.42V1.58 phase could be formed, and Ti at the interface could react with the oxygen and carbon of CFRP to form TiO2, TiO and TiC, forming a stable joint structure.
Highlights
With the increasing awareness of environmental protection in the industrial manufacturing industry, manufacturing standard is moving towards the direction of lightweight to reduce carbon emissions and save energy [1,2,3]
Resin based carbon fiber reinforced thermal-plastics (CFRP) is considered as a new type of high-performance composite materials, which obtains the advantages of small density, excellent corrosion resistance and high specific strength [4,5,6]
The composite structure formed by CFRP/Titanium alloy has a broad application prospect [12,13]
Summary
With the increasing awareness of environmental protection in the industrial manufacturing industry, manufacturing standard is moving towards the direction of lightweight to reduce carbon emissions and save energy [1,2,3]. Resin based carbon fiber reinforced thermal-plastics (CFRP) is considered as a new type of high-performance composite materials, which obtains the advantages of small density, excellent corrosion resistance and high specific strength [4,5,6]. It can be used even as the bearing material applying in the preparation of the aerospace field and crucial parts and components in automobile industry [6,7,8]. There are few studies on the laser welding between CFRP materials and titanium alloy, and the forming mechanism of the joint in the welding process is still unclear. Interfacial microstructure was tested, which revealed the formation of interface during the welding process and might provide an evidence for the bonding mechanism
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