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Ultrasonic wave residual stress test method and device

A technology of residual stress and testing method, applied in force/torque/work measuring instrument, measuring force, measuring device, etc., can solve problems such as limiting the development of ultrasonic residual stress testing method and affecting the testing accuracy of ultrasonic residual stress testing method.

Active Publication Date: 2016-08-10
四川优安协创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The influence of some large microstructure differences on the ultrasonic propagation velocity is even in the same order of magnitude as that of the welding residual stress on the ultrasonic propagation velocity, which seriously affects the test accuracy of the ultrasonic residual stress test method and limits the development of the ultrasonic residual stress test method.

Method used

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  • Ultrasonic wave residual stress test method and device
  • Ultrasonic wave residual stress test method and device
  • Ultrasonic wave residual stress test method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0080] A kind of embodiment of the present invention is: a kind of ultrasonic residual stress test method, its steps are as follows:

[0081] A1. Prepare grain size test sample

[0082] A11. Cut n groups of tensile samples parallel to the rolling or extrusion direction of the material, denoted as N 1 Group, N 2 group...N n-1 Group, N n group, each group of stretched samples includes the same stretched sample r a root;

[0083] A12. Do not do any treatment on the stretched samples of group N1, and 2 -N n Groups of stretched samples are subjected to heat treatment under different conditions, and the heat treatment conditions of the same group of stretched samples are the same, and the specific heat treatment conditions are: N 2 group tensile sample at temperature T a ℃ heat preservation h a hours, N 3 group tensile sample at temperature T a ℃ heat preservation h a +Δh a hours...N n-1 group tensile sample at temperature T a ℃ heat preservation h a +Δh a (n-1-2) h...

Embodiment 2

[0132] The ultrasonic residual stress testing method of the present embodiment is basically the same as that of the first embodiment, except that the selection of parameters in the steps is different, and the selection of each step parameter in the present embodiment is as follows:

[0133] In the step A11 described in this example, the number n of n groups of tensile samples cut in parallel to the rolling or extrusion direction of the material is 4. In the step A11, n groups of stretched samples are cut parallel to the material rolling or extrusion direction, and each group of stretched samples includes the number r of stretched sample roots a for 3. For N in the step A12 2 -N n Group stretched samples were subjected to heat treatment under different conditions, N 2 group tensile sample at temperature T a ℃ heat preservation h a Holding temperature T in hours a °C is the grain growth temperature of the tested tensile sample material. For N in the step A12 2 -N n Grou...

Embodiment 3

[0137] The ultrasonic residual stress testing method of the present embodiment is basically the same as that of the first embodiment, except that the selection of parameters in the steps is different, and the selection of each step parameter in the present embodiment is as follows:

[0138] In the step A11 described in this example, the number n of n groups of tensile samples cut in parallel to the rolling or extrusion direction of the material is 6. In the step A11, n groups of stretched samples are cut parallel to the material rolling or extrusion direction, and each group of stretched samples includes the number r of stretched sample roots a for 5. For N in the step A12 2 -N n Group stretched samples were subjected to heat treatment under different conditions, N 2 group tensile sample at temperature T a ℃ heat preservation h a Holding temperature T in hours a °C is the grain growth temperature of the tested tensile sample material. For N in the step A12 2 -N n Grou...

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Abstract

The invention provides an ultrasonic wave residual stress test method and device, belonging to the welding residual stress nondestructive test field. The test method comprises: first, establishing the relation database between grain sizes and longitudinal wave signal attenuation degrees, critical refraction longitudinal wave propagation time in a zero stress sample, and sonoelastic coefficients, and the relation database between precipitation phasors and longitudinal wave signal attenuation degrees, critical refraction longitudinal wave propagation time in a zero stress sample, and sonoelastic coefficients; and in testing residual stress test, first determining the longitudinal wave signal attenuation degree of a test area, determining grain size and precipitation phasor calculating values according to the attenuation degree, further calculating the propagation time of the critical refraction longitudinal wave of the test area in a zero stress stretching sample and a sonoelastic coefficient, and finally obtaining corrected residual stress. The test method can correct errors of the sonoelastic coefficient and the ultrasonic wave propagation time in a zero stress sample caused by welding different area grain sizes and precipitation phasors, and substantially improve ultrasonic wave residual stress precision. The device can realize the method, and realize nondestructive correction of ultrasonic wave residual stress test results.

Description

technical field [0001] The invention relates to an ultrasonic residual stress testing method capable of correcting the influence of microstructure differences and testing equipment for realizing the method, belonging to the field of non-destructive testing of welding residual stress. Background technique [0002] Welding is the most important connection method in industrial production. The quality of welding determines the quality of welding products. The damage of welded joints caused by excessive welding residual stress is the most important welding damage. The non-destructive testing of residual stress of welded joints plays a very important guiding role in optimizing the welding process in production practice. The non-destructive testing methods for residual stress mainly include neutron diffraction method, synchrotron radiation method, magnetic particle method, X-ray diffraction method and ultrasonic testing method. Among them, the neutron diffraction method and the sy...

Claims

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Application Information

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IPC IPC(8): G01L1/25G01L5/00
CPCG01L1/255G01L5/0047
Inventor 苟国庆朱其猛陈辉陈佳朱忠尹马传平覃超安江丽刘亚丽祝鹏飞
Owner 四川优安协创科技有限公司
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