Friction stir welding method for heterogeneous metal layered composite plate

Abstract

The invention belongs to the technical field of friction stir welding, and particularly relates to a friction stir welding method for a heterogeneous metal layered composite plate. In order to solve the dilution problem of a composite plate body in the friction stir welding process of the composite plate, a compensation plate made of the same material as the composite plate body is added to a preset to-be-welded position on one side of the composite plate body in the composite plate, then friction stir welding is conducted, so that the dilution problem of the composite plate body in the friction stir welding process is avoided, and therefore the mechanical property and the functionality of a heterogeneous bimetal layered composite board joint are ensured. The dilution problem of the composite plate body is the key technical problem urgently needing to be solved in welding of the heterogeneous composite plate with the low composite layer proportion through the friction stir welding technology, the problem is solved through a simple, easy and reliable method, the obtained welding joint is high in comprehensive performance, and the wide industrial application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of friction stir welding, and in particular relates to a friction stir welding method of heterogeneous metal layered composite plates. Background technique [0002] The heterogeneous metal layered composite board is a composite board composed of two parts: the doubler board and the substrate with different materials. The doubler board and the substrate with different materials and properties can often complement each other's advantages and disadvantages, so that in comprehensive performance, Compared with a single plate, it has obvious advantages in terms of cost performance. For example, for the titanium-steel clad plate, due to the presence of the titanium clad layer, compared with a single steel plate, the corrosion resistance is significantly improved; for the aluminum-copper clad plate, due to the effect of the copper clad layer, the clad plate has the same Copper and copper alloy plates are quite cond...

AI Technical Summary

Problems solved by technology

However, in the friction stir welding process, the heat generated by the friction between the high-speed rotating welding tool and the workpiece will partially melt the welded material, and when the welding tool moves forward along the welding interface, the plasticized material will Longitudinal flow will occur under the action of rotational friction, which will inevitably lead to the destruction of the thin doubler plate in the friction stir welding and the dilution of the doubler plate, which will seriously reduce the functionality of the composite plate joint.

At present, the dilution problem of doubler plates caused by friction stir welding has become a key technical problem to be solved urgently, which limits the use of friction stir welding technology in the welding of heterogeneous clad plates with a low proportion of clad layers.

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