A metal and thermoplastic composite material riveting and welding integrated friction spot welding method

Abstract

The invention provides a metal and thermoplastic composite material rivet welding integrated friction spot welding method, comprising the following steps: S1, selection of connecting body material: the material of the connecting body is the same as that of the thermoplastic composite material to be welded; S2, pre-opening Hole setting; S3, preparation of porous metal oxide layer: prepare porous metal oxide layer on the surface of the metal to be welded; S4, determine the size of the connecting body; S5, clamping and positioning: use thermoplastic composite material as the lower plate, and metal as the upper plate , use fixtures to install and fix it to eliminate the gap error between the two plates; position the connecting body and the preset hole so that the axis of the preset hole coincides with the axis of the connecting body; S6, welding. The metal and thermoplastic composite material riveting and welding integrated friction spot welding method according to the invention can realize short process cycle, no stress concentration, simple production process and no air hole defect when metal and thermoplastic composite material are connected.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a metal and thermoplastic composite material riveting and welding integrated friction spot welding method. Background technique [0002] Since the modern economy relies heavily on the consumption of fossil energy, the energy supply is increasingly tense and the environmental pressure is intensified. Economic and social development requires energy saving and emission reduction, and automobile lightweight is a relatively important part of my country's energy saving and emission reduction strategy. New materials for lightweight applications include aluminum alloys, magnesium alloys, titanium alloys, high-performance thermoplastic resin-based composite materials, Porous foam and composite materials, etc. Among them, the joining of metals to thermoplastic composites has received extensive attention. At present, the connection of polymers and their composite materials has...

AI Technical Summary

Problems solved by technology

Ultrasonic welding energy directors are difficult to manufacture and the size of the weldment is small, which is only suitable for thin-walled structures; laser welding has high requirements on the light transmittance of the workpiece to be welded, and the connection interface is easy to cause bubble defects, reducing the interface connection area and joint strength ; In addition, friction stir spot welding takes longer to join, which eventually leads to lower production efficiency and higher costs

Therefore, it is necessary to propose a new welding method for metal and thermoplastic composite materials to solve the problems of long process cycle, stress concentration, and production process when metal and thermoplastic composite materials are connected by adhesive bonding, mechanical connection and other welding methods. Problems such as complex and stomatal defects

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