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Pretreatment process for reducing defects of surface of ultrasonic impact test piece

An ultrasonic impact and pretreatment technology, which is applied in the field of improving the fatigue performance of welded joints and surface pretreatment, and can solve problems such as reduced surface quality, increased roughness, and complex shapes.

Inactive Publication Date: 2013-03-13
TIANJIN UNIV
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Problems solved by technology

Because ultrasonic impact can generate very large surface pressure, if there are some oil stains, scales, residues, etc. on the surface, they will be washed into the test piece under the strong impact force, thus forming surface defects with complex shapes, and the impact causes The uneven topography of the surface will reduce the surface quality and increase the roughness under the action of a certain diameter impact needle

Method used

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  • Pretreatment process for reducing defects of surface of ultrasonic impact test piece
  • Pretreatment process for reducing defects of surface of ultrasonic impact test piece

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Embodiment Construction

[0010] The technical solutions of the present invention will be further described below in conjunction with specific embodiments. Analyze the specific implementation steps and superiority of the process of the present invention by comparing the fatigue test results of three groups of test pieces: (A) 8 original welded test pieces do not carry out surface treatment and ultrasonic impact treatment; (B) 8 test pieces In the original state, no surface treatment was performed, and ultrasonic impact was directly performed; (C) 8 specimens were first treated on the upper surface, followed by ultrasonic impact treatment with the same process as Group A (B). The material used in the test is Q345 steel, and the dimensions of the fatigue specimens are as follows: figure 1 shown. The specific implementation process includes the following steps:

[0011] First, the surface cleaning process. The surface pretreatment process mentioned in the technical plan is only applied to the C group o...

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Abstract

The invention discloses a pretreatment process for reducing the defects of a surface of an ultrasonic impact test piece. The process comprises the following steps of carrying out degreasing and decontamination and then carrying out mechanical polishing. Through surface treatment, grease contaminations on the surface are removed, and residual slag and sharp parts on the surface of the test piece are polished off, so that higher surface quality is achieved. The surface conditions of the ultrasonic impact test piece are improved, and the sharpness of the surface is reduced, so that the crack initiation sources are reduced.

Description

technical field [0001] The technical solution of the present invention belongs to the technical field of ultrasonic impact technology, and more specifically relates to a technical solution for further improving the effect of ultrasonic impact on improving the fatigue performance of welded joints by performing surface pretreatment before impact. Background technique [0002] Ultrasonic impact is an ideal method to improve the fatigue performance of welded joints. It is light, flexible, high-efficiency and can be applied to various joint forms. At present, there are many studies on different impact processes of ultrasonic impact, but no treatment is performed on the surface of the impact test piece during impact, and the surface condition obtained after impact is very rough, with many cracks and uneven surface defects. The main application of the process invention is to solve the problem of surface defects caused by the ultrasonic impact process. Because ultrasonic impact can...

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Application Information

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IPC IPC(8): C21D10/00
Inventor 邓彩艳徐艳王东坡吴良晨王颖
Owner TIANJIN UNIV
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