A large-size aluminum-steel reaction-assisted thermal toughening friction welding method

Abstract

The invention provides a large-size aluminum-steel reaction-assisted heat-toughened friction welding method, which includes designing a bidirectional fitting structure for the welded joint of an aluminum member (20) and a steel member (10) and setting a welding auxiliary layer at the welded joint ; The design of the two-way fitting structure is specifically: on the surface of the steel member (10) to be welded, an annular steel inner groove (11), an annular steel boss (12) and an annular steel outer groove are sequentially processed outward from the central axis. Groove (13), an annular aluminum groove (21) is processed on the surface to be welded of the aluminum member; the welding auxiliary layer includes a reaction transition layer (51), a strengthening and toughening layer (52) and a reaction auxiliary heating layer (53) . This method effectively solves the problems that a large amount of brittle intermetallic compounds are easily generated during the welding process of steel components and aluminum components, the stress of the joint after welding is large, the strength of the welded joint is low, and the toughness is poor, and the friction welding between large-sized aluminum and steel components is realized. High welding efficiency and good welding quality.

Description

technical field [0001] The invention relates to the technical field of solid-phase welding, in particular to a large-size aluminum-steel reaction auxiliary thermal toughening friction welding method. Background technique [0002] Inertial friction welding refers to applying a certain axial pressure on the welding end faces of two weldments, and at the same time making the contact surfaces of the two weldments perform violent frictional movements, and the heat generated by friction heats the contact surfaces to a certain welding temperature (lower than the melting point of the material), stop the movement rapidly, and apply a certain upsetting pressure to cause a certain amount of plastic deformation of the two weldment metals, so that the two weldments are firmly welded together. [0003] The solid solubility of steel and aluminum is low, and a large number of brittle intermetallic compounds (such as FeAl 6 、FeAl 3 etc.), which will lead to poor weld performance (such as l...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above existing problems in the prior art, the object of the present invention is to provide a large-size aluminum-steel reaction-assisted heat toughening friction welding method, which effectively solves the problem that a large number of brittle intermetallic compounds are easily generated during the welding process of steel components and aluminum components. , high joint stress after welding, low strength of welded joints, poor toughness and other problems, improve welding capacity, use small welding machine to realize friction welding between large-sized aluminum / steel components, high welding efficiency and good welding quality

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