Dissimilar metal semi-solid friction brazing method based on high-frequency assistance

Abstract

The invention discloses a dissimilar metal semi-solid friction brazing method based on high-frequency assistance. The method comprises the following steps that 1, a stud to be welded and a workpiece to be welded are prepared, wherein the welding end of the stud to be welded is machined into a taper step shape, a taper thread shape or a taper step thread shape, a preset hole is machined at the surface to be welded of the workpiece to be welded, and a brazing filler metal is placed on the inner wall of the preset hole of the workpiece to be welded; 2, a high-frequency induction coil is adopted to heat the welding end of the stud to be welded to 300-500 DEG C, and heat preservation is carried out for 1-5 min; 3, a friction phase is started, and friction is carried out for 3-8 s at rotation speed with 600-1500 r / min and friction pressure with 10-40 MPa; 4, an upsetting phase is stared, friction is rotatably stopped emergently, the emergency stop time is less than 0.5 s, the upsetting pressure with 15-60 MPa is applied, the upsetting time is 3-10 s, and the displacement of the stud to be welded in the upsetting phase is 1-3 mm; and 5, after upsetting is finished, duration is carried outfor 10-25 s at the pressure of 15-60 MPa, and then air cooling is carried out to room temperature. The dissimilar metal semi-solid friction brazing method can realize high-quality connection of dissimilar metals, has the dual advantages of "metallurgical bonding + mechanical occlusion", and improves the mechanical property and the welding efficiency of a joint.

Description

technical field [0001] The invention relates to a stud friction welding method, in particular to a high-frequency-assisted semi-solid friction brazing method for dissimilar metals. Background technique [0002] Dissimilar metal composite structures have very bright application prospects in industries such as automobiles, aircraft, and weaponry due to their light weight, high comprehensive performance, and the combination of "light + strong" composite structures. However, there are huge physical and chemical properties between the two. There are still many practical problems in the welding of dissimilar metal materials. Nowadays, the development of welding technology for dissimilar metal composite components lags behind the development of other forming techniques to a large extent, and has become a bottleneck for the practical application of the pair of dissimilar metals. Therefore, it is very necessary to deeply analyze and study the scientific problems of the connection of...

AI Technical Summary

Problems solved by technology

This method can realize stud welding of dissimilar metal materials, and solves the problem of insufficient welding heat by combining friction and arc composite heat sources. However, due to the high requirements for welding equipment in this method, high current auxiliary welding is required, and the joint interface is prone to appear thicker The intermetallic compound layer, which affects the overall performance of the joint

At the same time, due to the need for stud head arc ignition, the design range of the stud head structure is limited, which reduces the mosaic effect of the stud

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