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Treatment method for prolonging fatigue life of welding part

A fatigue life and treatment method technology, applied in the field of weldments, can solve problems such as unstable energy output, unqualified products, and poor stability of ultrasonic impact performance, so as to reduce the probability of fatigue crack growth, increase fatigue life, and improve the effect Effect

Inactive Publication Date: 2017-12-12
HEFEI ZHENGMING MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest problem with ultrasonic shock is that the energy output is unstable. Ultrasonic shock can eliminate harmful residual tensile stress on the surface of the component or weld area, introduce beneficial compressive stress, and strengthen the impact part. However, due to the poor performance stability of ultrasonic shock, it often leads to product failure. Unqualified products appear in batch processing, or part of a product is processed well, and the other part is not processed well, resulting in some waste products

Method used

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  • Treatment method for prolonging fatigue life of welding part

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Comparison scheme
Effect test

Embodiment 1

[0019] A treatment method for improving the fatigue life of welded parts, comprising the following steps:

[0020] (1) Preheating treatment: preheat the weldment in a resistance furnace under nitrogen protection, and the preheating temperature is 320-350°C;

[0021] (2) The first ultrasonic shock treatment: the welded parts preheated in step (1) are subjected to the first ultrasonic shock treatment under a magnetic field of 20T, and the number of ultrasonic treatments is 2500 times / mm²;

[0022] (3) Irradiation treatment: Use the high-current pulsed ion beam composed of mixed ion beams to irradiate the welded parts treated in step (2). The number of irradiations is 5 times, and the irradiation time is 3-6s each time. The time interval is 1.5min;

[0023] (4) The second ultrasonic impact treatment: The welded parts treated in step (3) are subjected to the second ultrasonic impact treatment under a magnetic field of 50T, and the number of ultrasonic treatments is 35000 times / mm...

Embodiment 2

[0032] A treatment method for improving the fatigue life of welded parts, comprising the following steps:

[0033] (1) Preheating treatment: preheat the weldment in a resistance furnace under nitrogen protection, and the preheating temperature is 320-350°C;

[0034] (2) The first ultrasonic shock treatment: the welded parts preheated in step (1) are subjected to the first ultrasonic shock treatment under a magnetic field of 20T, and the number of ultrasonic treatments is 2500 times / mm²;

[0035] (3) Irradiation treatment: Use the high-current pulsed ion beam composed of mixed ion beams to irradiate the welded parts treated in step (2). The number of irradiations is 5 times, and the irradiation time is 3-6s each time. The time interval is 1.5min;

[0036] (4) The second ultrasonic impact treatment: The welded parts treated in step (3) are subjected to the second ultrasonic impact treatment under a magnetic field of 50T, and the number of ultrasonic treatments is 35000 times / mm...

Embodiment 3

[0045] A treatment method for improving the fatigue life of welded parts, comprising the following steps:

[0046] (1) Preheating treatment: preheat the weldment in a resistance furnace under nitrogen protection, and the preheating temperature is 320-350°C;

[0047] (2) The first ultrasonic shock treatment: the welded parts preheated in step (1) are subjected to the first ultrasonic shock treatment under a magnetic field of 20T, and the number of ultrasonic treatments is 2500 times / mm²;

[0048] (3) Irradiation treatment: Use the high-current pulsed ion beam composed of mixed ion beams to irradiate the welded parts treated in step (2). The number of irradiations is 5 times, and the irradiation time is 3-6s each time. The time interval is 1.5min;

[0049] (4) The second ultrasonic impact treatment: The welded parts treated in step (3) are subjected to the second ultrasonic impact treatment under a magnetic field of 50T, and the number of ultrasonic treatments is 35000 times / mm...

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Abstract

The invention discloses a treatment method for improving the fatigue life of welded parts, which relates to the technical field of welded parts, including: (1) preheating treatment; (2) first ultrasonic impact treatment; (3) irradiation treatment; (4) The second ultrasonic impact treatment; (5) high current treatment; a treatment method for improving the fatigue life of the weldment provided by the present invention can not only significantly eliminate the residual stress of the weldment, but also significantly improve the fatigue resistance of the weldment performance.

Description

technical field [0001] The invention belongs to the technical field of welded parts, and in particular relates to a treatment method for improving the fatigue life of welded parts. Background technique [0002] As one of the material connection methods, welding is widely used in the production of magnesium alloy parts. The welding process is an unbalanced process of rapid heating and cooling, which causes welding residual stress in the welded structural parts, which can seriously affect the performance of the components, making the welded components prone to fracture during use and reducing the corrosion resistance of the components performance and fatigue life. Ultrasonic impact technology is an efficient method to eliminate harmful residual tensile stress on component surface or weld area and introduce beneficial compressive stress. The biggest problem with ultrasonic shock is that the energy output is unstable. Ultrasonic shock can eliminate harmful residual tensile str...

Claims

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Application Information

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IPC IPC(8): C21D10/00
CPCC21D10/00
Inventor 周正明
Owner HEFEI ZHENGMING MACHINERY CO LTD
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