Laser swing welding method for lap joint structure of thermoplastic composite material and aluminum alloy

Abstract

The invention relates to the technical field of dissimilar material connection, and discloses a laser swing welding method for a lap joint structure of a thermoplastic composite material and an aluminum alloy. The method comprises the steps that S1, sand blasting treatment is conducted on the laser welding surface of the aluminum alloy, and a nail hook structure is machined on the connecting surface through laser; S2, the interface of a lap joint between the thermoplastic composite material and the aluminum alloy is filled with a certain thickness of resin material; S3, a linear or dot-matrixclamping mode is selected according to the thickness of a to-be-welded part, and a stable lap joint is obtained; S4, the size, shape and defocusing amount of a light spot are determined according to the size and requirement of the to-be-welded part, and a laser swing track and a scanning path are designed; and S5, a laser device is started to weld the lap joint, a cooling device is used for cooling weld joints after the welding of each weld joint is completed, and then subsequent welding is conducted. The method can effectively improve the mechanical property of the connecting joint between the thermoplastic composite material and the aluminum alloy, is good in weld joint forming and high in quality, and has a wide application prospect in the aerospace field.

Description

technical field [0001] The invention relates to a laser welding method for a thermoplastic composite material and an aluminum alloy, in particular to a laser swing welding method for a lap joint structure between a thermoplastic composite material and an aluminum alloy, and belongs to the technical field of connection of dissimilar materials. Background technique [0002] Thermoplastic composites are considered as a valuable composite material due to their high strength, corrosion resistance, and heat resistance, and have a wide range of applications in aerospace manufacturing. At the same time, aluminum alloy materials are still important structural materials for aerospace vehicles because they can not only meet the lightweight design concept, but also meet the mechanical properties of core components. Therefore, the problem of joining aluminum alloys to thermoplastic composites is unavoidable. The traditional connection methods of aluminum alloy and thermoplastic composit...

AI Technical Summary

Problems solved by technology

However, due to the anisotropy of thermoplastic composite materials, the holes generated during the mechanical connection process will affect the mechanical properties of the joint, and the use of fasteners will also increase the weight of the overall structure, which does not meet the lightweight requirements

Compared with mechanical connection, although the adhesive bonding technology has no damage to the material, no stress concentration in the connection, and excellent fatigue resistance, the process is complicated and the connection performance of the joint is poor, which cannot meet the practical application of thermoplastic composite materials.

Images