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Method for overlap joint of special-shaped titanium aluminum metal through friction stir welding by utilizing pre-stacking aluminum layer

A technology of friction stir welding and dissimilar metals, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of low connection strength, wear of welding tools, embrittlement of connection joints, etc., and achieve increased metallurgy Combined area, reduced welding tool wear, and improved joint strength

Inactive Publication Date: 2015-11-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of joint embrittlement caused by titanium-aluminum intermetallic compounds when titanium-aluminum dissimilar materials are overlapped, low connection strength and serious wear of welding tools, the invention provides a pre-stacked solid-phase aluminum layer using friction surfacing welding as Intermediate transition layer, method for realizing friction stir welding of titanium-aluminum dissimilar metals

Method used

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  • Method for overlap joint of special-shaped titanium aluminum metal through friction stir welding by utilizing pre-stacking aluminum layer
  • Method for overlap joint of special-shaped titanium aluminum metal through friction stir welding by utilizing pre-stacking aluminum layer
  • Method for overlap joint of special-shaped titanium aluminum metal through friction stir welding by utilizing pre-stacking aluminum layer

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specific Embodiment approach 1

[0018] Specific implementation mode one: combine figure 1 and figure 2 Describe this implementation mode, this implementation mode is realized through the following steps:

[0019] Step 1: Texture treatment: Texturize the surface of the titanium alloy plate 1 to be welded, so that the average surface roughness of the area to be welded on the titanium alloy plate 1 is greater than or equal to 5 μm, and the distance between the texturized part 4 and the edge of the titanium alloy plate 1 is 10 mm ~40mm, the width d of the texturized part 4 is 15mm~25mm, and the texturing method is machining texturing, sandblasting texturing or laser texturing;

[0020] Step 2: Clean the titanium alloy plate 1: first use ultrasonic cleaning to clean the roughened titanium alloy plate 1 to remove residual particles, and then use an organic solvent or cleaning agent to wipe the surfaces of the titanium alloy plate 1, aluminum alloy plate 2 and aluminum rod 3, Remove oil and metal dust; titanium ...

specific Embodiment approach 2

[0023] Specific implementation mode two: combination figure 1 Describe this embodiment. In this embodiment, when the texturing method in step 1 adopts machining to roughen the surface of the titanium alloy plate 1, it is required to carry out texturing in a direction parallel and perpendicular to the welding direction or having an acute angle with the welding direction. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0024] Specific implementation mode three: combination figure 1 Describe this embodiment, this embodiment is that when the texturing method in step 1 adopts sandblasting treatment, the sandblasting pressure is 8MPa~15MPa, the nozzle distance of the spray gun is 60mm~140mm from the texturing part 4, and the angle of the spray gun is 45°~75° °. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses a method for overlap joint of special-shaped titanium aluminum metal through friction stir welding by utilizing a pre-stacking aluminum layer, which is used for solving the problems that when the special-shaped titanium aluminum materials are subjected to overlap joint, a connecting joint is embrittled, the connecting strength is low, and a welding tool is worn seriously due to a titanium aluminum metal compound. The method comprises the steps of firstly, roughening the surface of a titanium alloy plate to be welded; secondly, ultrasonically cleaning the roughened titanium alloy plate, wiping the titanium alloy plate, an aluminum alloy plate and an aluminum rod by adopting an organic solvent or a cleaning agent; thirdly, forming a pre-stacking solid phase aluminum layer subjected to combined action of alloy connection and mechanical connection at the joint of the roughening part; and fourthly, forming an overlap joint head on which the aluminum alloy plate is arranged at the upper part and the titanium alloy plate is arranged at the lower part, carrying out friction stir welding on the aluminum alloy plate and the titanium alloy plate, controlling the end part of a stirring needle to prick into the pre-stacking solid phase aluminum layer and controlling the end part of the stirring needle to not contact with the surface of the titanium alloy plate, thus realizing the effective connection between the pre-stacking solid phase aluminum layer and the aluminum alloy plate to be welded under the effect of the stirring of the stirring needle and the upsetting of a shaft shoulder. The method is used for the overlap welding of the special-shaped titanium aluminum materials.

Description

technical field [0001] The invention relates to a friction stir welding method, in particular to a method for realizing friction stir welding overlapping of titanium and aluminum dissimilar metals by using a pre-stacked aluminum layer. Background technique [0002] As lightweight and high-strength materials, titanium alloys and aluminum alloys have great application potential and economic value in high-tech fields such as aerospace and energy. This kind of alloy material has unique advantages, such as light weight, high specific strength, impact resistance and so on. Improving the thrust-to-weight ratio, reducing weight, and increasing payload have always been the goals of aircraft structure and aero-engine designers. According to statistics, the amount of titanium alloy in various metal structural materials of second-, third-, and fourth-generation military fighter jets accounts for 38.8% of the overall weight. . One of the keys to the promotion and application of titaniu...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/22B23K20/24B23K103/18
CPCB23K20/127B23K20/22B23K20/24B23K2103/18
Inventor 黄永宪吕宗亮万龙吕世雄周利冯吉才
Owner HARBIN INST OF TECH
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