A semi-solid friction brazing method for dissimilar metals based on high frequency assistance

Abstract

The invention discloses a semi-solid friction brazing method for dissimilar metals based on high-frequency assistance, which includes the following steps: step 1, preparing a stud to be welded and a workpiece to be welded, and the welding end of the stud to be welded is processed into a tapered step shape, taper thread shape or taper step thread shape, the workpiece to be welded is processed with a preset hole, and the solder is placed on the inner wall of the preset hole of the workpiece to be welded. Step 2, using a high frequency induction coil to Heating the welding end of the welding stud to 300-500°C and keeping it warm for 1-5 minutes; step 3, the friction stage, rubbing at a speed of 600-1500r / min and a friction pressure of 10-40MPa for 3-8s; step 4, the upsetting stage, friction rotation Emergency stop, the emergency stop time is less than 0.5s, the upsetting pressure is 15-60MPa, the upsetting time is 3-10s, and the displacement of the stud to be welded during the upsetting stage is 1-3mm. Step 5: After upsetting, hold the load under a pressure of 15-60 MPa for 10-25 seconds, and then air-cool to room temperature. It can realize the high-quality connection of dissimilar metals, has the dual advantages of "metallurgical bonding + mechanical occlusion", and improves the mechanical properties and welding efficiency of the 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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