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Method for eliminating welding residual stress

A technology for residual stress and welding parts, which is applied in the field of positioning and eliminating welding residual stress by means of vibration and impact method, which can solve the problems of high energy consumption and bulky equipment, and achieve low energy consumption, high efficiency and good elimination effect

Active Publication Date: 2017-04-05
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a device and method for eliminating the residual stress of the weld by using the vibration shock method, so as to solve the problems of randomness, high energy consumption and bulky equipment in the existing hammering or shot peening technology

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  • Method for eliminating welding residual stress

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Embodiment Construction

[0019] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. It should be understood that the embodiments described below by referring to the figures are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

[0020] Such as figure 1 As shown, it is a reciprocating impact strengthening device used to generate compressive stress in the weld of metal welding parts. Table 7 and ultrasonic generator 8, wherein the welding piece 6 is placed on the work table 7. On the frame 1, a guide rail is provided along the Z-axis direction, and the slide box 2 can move up and down along the Z-axis (vertical) direction and move back and forth along the X-axis (perpendicular to the paper plane) on the guide rail. The ultrasonic transducer 3 is arranged at the lower part of the sliding box 2 , the amplitude-changing impact rod 4 is connected with the ultrasonic tra...

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Abstract

The invention discloses a method for eliminating welding residual stress. The method comprises the steps that an X-ray diffraction (XRD) test is conducted on a welding part for surface welding residual stress testing, and welding residual stress surface layer data is obtained; a welding simulation model of the welding part is established, simulation data of the welding residual stress is calculated, and then the distribution law of the welding residual stress of the welding part is finally obtained; numerical simulation calculation of the vibration impact process is conducted by simulating the impact frequency and the impact amplitude on the basis of the distribution law of the welding residual stress, and then vibration impact parameters for eliminating the welding residual stress are obtained; the welding part is clamped in a drivable positioning workbench, the positions of an impact head and a welding part welding joint on the positioning workbench are adjusted, and impact treatment is conducted in the mode that the axis of the impact head arranged on the workbench is perpendicular to the weld joint surface of the welding part according to the impact frequency and impact amplitude which are obtained before. The method has the advantages of being precise, low in energy consumption, good in eliminating effect, high in efficiency and the like.

Description

technical field [0001] The invention mainly relates to a method for eliminating welding residual stress, more precisely, a method for locating and eliminating welding residual stress by means of a vibration shock method. Background technique [0002] Welding stress is one of the main factors that directly affect the manufacturability and service reliability of welded structures. If there is welding residual stress with too large value and uneven distribution in the welded structure, it will cause instability and damage such as hot and cold cracks, brittle fracture, fatigue fracture, stress corrosion fracture, etc. in the welded structure, and will also cause welding deformation, affecting the structure Therefore, how to improve the welding residual stress has become the most important problem to improve the performance of the welded structure, and it is also the subject that the majority of scientific researchers have been working hard on. [0003] At present, there are man...

Claims

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Application Information

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IPC IPC(8): C21D9/50C21D10/00C21D11/00
CPCC21D9/50C21D10/00C21D11/00Y02P10/20
Inventor 张洪伟薛六涛陈茂进纪思齐
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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