Experimental research on CFRTP-Al alloy laser butt joining

Abstract Joining Al alloy with CFRTP has received significant attention because of its potential application in automobile, aviation industry. Lots of works have been carried out on CFRTP-metal lap welding. However, there is little work focused on CFRTP-Al alloy laser butt-welding. To improve the strength of the CFRTP-Al alloy butt joint, microtextures were prepared on the Al alloy surface by pulsed lasers and a PA resin layer with a proper thickness was added in the CFRTP-Al alloy interface. Six factors and five levels orthogonal experiments were designed and carried out. The joint strength with different welding parameters was examined and the joint fracture interface was detected. The result showed that with the proper welding parameters the melting PA resin flows into the microtextures of the Al alloy and a mechanical anchoring was produced, and a butt joint with the strength about 12MPa can be obtained.