Large-size aluminum-steel reaction auxiliary heating and toughening friction welding method

Abstract

The invention provides a large-size aluminum-steel reaction auxiliary heating and toughening friction welding method. According to the method, two-way embedded structure design is conducted on a welding joint of an aluminum component (20) and a steel component (10), and a welding auxiliary layer is arranged at the welding joint. According to the two-way embedded structure design, specifically, an annular steel inner groove (11), an annular steel boss (12) and an annular steel outer groove (13) are sequentially machined in the to-be-welded face of the steel component (10) from a center shaft to the outside, and an annular aluminum groove (21) is machined in the to-be-welded face of the aluminum component. The welding auxiliary layer comprises a reaction transition layer (51), a reinforcing and toughening layer (52) and a reaction auxiliary heating layer (53). The method effectively solves the problems that in the welding process of the steel component and the aluminum component, a large number of brittle intermetallic compounds are likely to be generated, the stress of a welded joint is large, the strength of the welded joint is low, and toughness is poor, friction welding between the large-size aluminum component and the large-size steel component is achieved, the welding efficiency is high, and the welding quality is good.

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 amount of brittle intermetallic compounds (such as FeAl 6 、FeAl 3 etc.), will lead to poor weld performance (such as low str...

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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