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Zero-stress sample for ultrasonic stress measurement method and preparation method of zero-stress sample

A technology for stress measurement and sample preparation, which is applied in the preparation of test samples, calibration/testing of force/torque/power measuring instruments, measuring devices, etc., which can solve the uneven residual stress level and high accuracy of ultrasonic stress measurement Problems such as difficult processing and evaluation of high-degree zero-stress samples, to eliminate uneven heat distribution, facilitate measurement, and stabilize performance

Pending Publication Date: 2021-08-24
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a zero-stress sample for ultrasonic stress measurement and its preparation method, aiming at solving the problem of high accuracy of ultrasonic stress measurement caused by the uneven residual stress level of steel pipes. It is difficult to process and evaluate high-degree zero-stress samples. It is of great significance to standardize the preparation of ultrasonic zero-stress samples and improve the accuracy of residual stress testing by providing higher-precision and larger-scale representative zero-stress samples for ultrasonic stress measurement.

Method used

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  • Zero-stress sample for ultrasonic stress measurement method and preparation method of zero-stress sample
  • Zero-stress sample for ultrasonic stress measurement method and preparation method of zero-stress sample
  • Zero-stress sample for ultrasonic stress measurement method and preparation method of zero-stress sample

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preparation example Construction

[0033] Such as figure 1 As shown, the zero stress sample preparation method used in the ultrasonic stress measurement method provided by the present invention, through the process method of comprehensive annealing, wire cutting and multiple small hole method detection and calibration, obtains the zero stress sample, which is the residual stress of the ultrasonic method The engineering measurement accuracy is guaranteed, which includes the following steps:

[0034] Step 1: Selection and production of incoming materials for calibration of zero stress samples

[0035] Specifically, when selecting incoming materials for calibration of zero-stress samples, materials with the same processing process as the materials used for residual stress and stress test objects should be selected; For cutting, if flame, plasma cutting and other heat-affected processing methods are used, the heat-cut samples need to be cut twice to remove the heat-affected zone;

[0036] Step 2: Sample preparati...

Embodiment

[0052] This embodiment is used for the zero-stress sample preparation method of the ultrasonic stress measurement method, comprising the following steps:

[0053] Step 1: Selection and production of incoming materials for calibration of zero stress samples

[0054] Aiming at the residual stress measurement requirements of an X80 high steel pipeline structure (wall thickness 21.5mm) at a site of a long-distance oil and gas pipeline of an oil company, consult the original record information such as procurement and production, and select the same supplier as the material to be tested, The X80 high-grade steel pipe material with the same pipe-making process is used as the zero-stress sample processing sampling material.

[0055] The raw materials for sample preparation are obtained by cutting from the above-mentioned X80 base material by wire cutting technology, and try to avoid the processing and sampling methods that bring heat effects such as flame cutting and plasma cutting. ...

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Abstract

The invention discloses a zero-stress sample for an ultrasonic stress measurement method and a preparation method of the zero-stress sample. The preparation method mainly comprises the following steps: (1) selecting and preparing a calibrated incoming material of the zero-stress sample; (2) carrying out sample preparation and marking; (3) performing zero stress detection for the first time; (4) determining a stress relief annealing process of the zero-stress sample; (5) performing stress relief annealing treatment on the sample; (6) performing secondary zero stress detection; (7) further releasing stress through linear cutting; (8) performing zero stress detection for the third time; and (9) carrying out sample delivery and sealing. The invention provides a new technical means for the preparation and calibration of the zero-stress sample, and can solve the problem that it is difficult to process and evaluate a high-accuracy zero-stress sample due to the non-uniform residual stress level of the in-service steel pipe and plate. The zero-stress sample with higher precision and larger representation range can be provided for ultrasonic stress measurement of high-grade pipeline steel, and the method has important significance in standardizing preparation of the ultrasonic zero-stress sample and improving the residual stress test precision of the pipeline steel.

Description

technical field [0001] The invention relates to the technical field of residual stress measurement, in particular to a zero-stress sample used in an ultrasonic stress measurement method and a preparation method thereof. Background technique [0002] Residual stress is one of the main factors in the quality control of pipes, one of the factors causing the expansion and failure of in-service pipeline defects, and one of the important parameters for the evaluation of defect applicability. For in-service pipes and plates, the residual stress in the structure can be measured non-destructively stress is important. There are many methods for measuring residual stress, but the currently applied methods have great limitations. For example, the small hole method is accurate but causes damage to the workpiece, and the measurement depth of X-ray diffraction method is too low. The traditional residual stress measurement method is difficult to meet the stress measurement of pipelines and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L25/00G01N29/30G01N1/28
CPCG01L25/00G01N29/30G01N1/286G01N2001/2893G01N2001/2873G01N2291/02827
Inventor 李丽锋罗金恒武刚王珂朱丽霞吴锦强邹斌徐春燕
Owner BC P INC CHINA NAT PETROLEUM CORP