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Ultrasonic impact treatment method for reducing residual stress of titanium alloy thin plate welded structure

An ultrasonic impact and welding structure technology, applied in the field of metal processing, can solve the problems of coarse grains, size and structure limitation, metal oxidation in the weld area, and achieve the effects of large energy consumption, consistency guarantee, and simple operation.

Inactive Publication Date: 2018-07-03
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods all have certain limitations and timeliness. For example, although the heat treatment method can effectively reduce the residual stress and is widely used, it consumes a lot of energy and takes a long time; the size and structure are limited; it causes problems such as metal oxidation and coarse grains in the weld zone.
Although traditional mechanical methods can save energy and have low cost, the application range of each method has certain limitations

Method used

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  • Ultrasonic impact treatment method for reducing residual stress of titanium alloy thin plate welded structure
  • Ultrasonic impact treatment method for reducing residual stress of titanium alloy thin plate welded structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Ultrasonic impact treatment was performed on electron beam welded structures of 3 mm thick titanium alloy sheets. Include the following steps:

[0025] Step 1: Selection of impact head: According to the welding method of titanium alloy sheet, the shape of the impact head is closely related to the shape of the welded joint. In vacuum electron beam welding, the weld width is 5mm narrower, so a flat impact of 2mm is selected. head;

[0026] Step 2: Optimization of ultrasonic impact treatment process parameters: According to the optimized treatment process of titanium alloy thin plate electron beam welding welding components, the impact method is welding toe impact process, the impact speed is 200mm / min, the width is 4mm, the impact angle is 90°, the impact The number of times is 3 times, one-sided impact;

[0027] Effect evaluation: use the conventional stress test method to test the stress before and after the ultrasonic impact treatment of the electron beam welded stru...

Embodiment 2

[0029] Electron beam welded structures of 1 mm thick titanium alloy sheets were subjected to ultrasonic shock treatment. Include the following steps:

[0030] The first step: selection of the impact head: according to the electron beam welding structure of the titanium alloy thin plate, the weld width is 3mm, so a flat impact head of 2mm is selected;

[0031] Step 2: Ultrasonic impact treatment process parameter optimization: According to the optimized treatment process of titanium alloy thin plate electron beam welding welding components, the impact method is welding toe impact process, the impact speed is 150mm / min, the width is 4mm, the impact angle is 90°, the impact The number of times is 3 times, one-sided impact.

[0032] Effect evaluation: Use the conventional stress test method to test the stress before and after the ultrasonic impact treatment on the 1mm thick titanium alloy thin plate electron beam welding structure. The stress value at the welded joint before the ...

Embodiment 3

[0034] Electron beam welded structures of 1 mm thick titanium alloy sheets were subjected to ultrasonic shock treatment. Include the following steps:

[0035] The first step: selection of the impact head: according to the electron beam welding structure of the titanium alloy thin plate, the weld width is 6mm, so a flat impact head of 2.5mm is selected;

[0036] Step 2: Optimization of ultrasonic impact treatment process parameters: According to the optimized treatment process of titanium alloy thin plate electron beam welding welding components, the impact method is welding toe impact process, the impact speed is 200mm / min, the width is 4mm, the impact angle is 90°, the impact The number of times is 4 times, one-sided impact.

[0037] Effect evaluation: The conventional stress test method is used to test the stress before and after the ultrasonic impact treatment of the electron beam welded structure of the 1mm thick titanium alloy sheet. The peak stress in the center is 745...

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Abstract

The invention relates to an ultrasonic impact treatment method for reducing the residual stress of a titanium alloy thin plate welded structure, belonging to the technical field of metal processing. The ultrasonic impact treatment method specifically comprises the following steps: (1) selecting an impact head: carrying out ultrasonic impact treatment on the titanium alloy thin plate welded structure, wherein the shape of the selected impact head is closely relevant with the shape of a welding joint according to a titanium alloy thin plate welding method, the width of a weld joint of the impacthead is narrow during vacuum electron beam welding, a tabular impact head is adopted, and the width of the impact head is 1.5mm-2.5mm; and (2) carrying out ultrasonic impact treatment process, wherein the impact manner is weld toe impact, the impact number of times is 2-4, the impact speed is 150mm / min-300mm / min. According to the ultrasonic impact treatment method, the targeted and selective treatment of the weld joint can be realized; and the welding residual stress can be obviously eliminated by virtue of the treatment process, and the beneficial pressure stress can be further introduced.

Description

technical field [0001] The invention relates to an ultrasonic impact process method for reducing the residual stress of a welded structure of a titanium alloy thin plate, belonging to the technical field of metal processing. Background technique [0002] Metal welding is a process commonly used in metal processing. Welding is a localized and uneven heating and cooling process. After metal materials are welded, due to the uneven and distributed temperature field, the residual tensile stress of the weld is generated. Welding residual stress has a great influence on welded components, which will lead to stress concentration during static load, causing deformation and cracking; reducing the stability of compression components; reducing structural rigidity and fatigue strength; reducing weldment processing accuracy and dimensional stability; will cause Stress corrosion cracking. These effects will greatly reduce the service life of welded components and limit their use environm...

Claims

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Application Information

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IPC IPC(8): C22F1/18C21D9/50C21D7/06
CPCC21D7/06C21D9/50C22F1/183Y02P10/20
Inventor 宋晓云钱广禄惠松骁叶文君于洋刘睿张文婧
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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