A current-assisted thermal field friction stir welding method for titanium alloy material butt joint

Abstract

The invention discloses a current-assisted thermal field friction stir welding method for butt jointing of titanium alloy materials, and belongs to the technical field of material forming. The invention solves the problems that the welding seam structure is unstable under the high-temperature use state when the welding method is used to manufacture Ti-Al-based alloy and other complex-shaped hot-end thin shell components, and the plasticity of the material at room temperature is low, which leads to defects in the welding process and the like. The present invention makes the surface of the masterbatch to be welded reach the plastic deformation temperature of the material faster through the method of current assisted heating, improves the welding efficiency and effectively avoids the severe wear when the stirring head reaches a higher temperature, and obtains a material with good shape and excellent mechanical properties. welds. In addition, the present invention can also realize local stress relief annealing of the weld seam through current-assisted heating after welding, reduce the residual stress level of the weld seam, further improve the bearing service performance of the joint, and realize the integrated manufacturing process of welding-stress relief annealing.

Description

technical field [0001] The invention relates to a current-assisted thermal field friction stir welding method for butt jointing of titanium alloy materials, belonging to the technical field of material forming. Background technique [0002] Lightweight high-temperature complex thin-walled components refer to the use of high temperature resistance (long-term use temperature of 600-800 ° C) and light weight (density of 5g / cm 3 Left and right) materials can greatly reduce the weight and has a high-precision complex thin-walled structure of the hot end components. [0003] Hot-end thin-shell components are a large class of parts widely used in equipment. Their weight reduction, shape complexity, and precision are all key factors related to the range, rate of fire, and mobility of the equipment. Development is decisive. Ti-Al-based alloys have attracted extensive attention due to their high specific strength, specific creep strength and specific fatigue strength, especially as ...

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Problems solved by technology

[0006] In order to solve the problems of the existing welding method in the manufacture of Ti-Al-based alloy and other complex-shaped hot-end thin shell components, the weld structure is unstable under high-temperature use, and the plasticity of the material at room temperature is low, resulting in defects during the welding process. Current-assisted thermal field friction stir welding method for titanium alloy material butt joint

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