Method for adjusting and controlling brittle phase in titanium/aluminum dissimilar metal friction stir welding joint

Abstract

The invention discloses a method for adjusting and controlling the brittle phase in a titanium / aluminum dissimilar metal friction stir welding joint. The method adopts the principle of introducing a third alloy element by adding a zinc-based intermediate layer to block the direct contact between titanium atom and aluminum atom, so as to disturb the generation of brittle phase in a Ti-Al system. The method comprises the following specific steps: mounting a self-made stirring head; clamping a workpiece to be welded and a zinc-based intermediate layer material, and laying the zinc-based intermediate layer material in a position butted with the workpiece to be welded; adjusting the position of the stirring head, so as to enable the stirring head to be in an initial position; setting welding technical parameters including the rotate speed of the stirring head, a welding speed, a welding dip angle and press amount; ensuring that a stirring pin is pressed into the workpiece under the technical parameters and moves in the direction parallel with the joint of the workpiece to be welded at the welding speed, and accomplishing the friction stir welding of the workpiece to be welded. The method realizes the adjustment and control of the brittle phase in the titanium / aluminum dissimilar metal friction stir welding joint, and effectively improves the performance of the welding joint.

Description

technical field [0001] The invention relates to a method for regulating and controlling the brittle phase in the friction stir welding joint of titanium / aluminum dissimilar metals, belonging to the field of welding metallurgy. Background technique [0002] Aluminum alloy has low density, good corrosion resistance and economical efficiency, and is currently a metal material widely used in high-tech fields such as aerospace and weaponry; titanium alloy has become the most popular aerospace material due to its advantages of corrosion resistance, high specific strength and impact resistance. New materials that are developing rapidly in the field. In the aerospace industry and the automobile industry, because titanium / aluminum dissimilar metal composite components meet the requirements of "reducing weight, increasing propulsion ratio, and increasing payload", it is widely used, such as seat rails, wing honeycomb sandwiches, etc. . [0003] However, due to the active chemica...

AI Technical Summary

Problems solved by technology

At present, it has been rapidly developed in all aspects of the industrial field, but brittle phases are easily generated in the friction stir welded joints of titanium / aluminum dissimilar metals, and the distribution of brittle phases is uneven, resulting in unstable performance of the joints and seriously deteriorating the quality of the joints. Mechanical properties, its wide application prospects are limited to some extent

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