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A Method of Determining the Benchmark Sensitivity of Steel Plate Flaw Detection Using Single Crystal Probe

A reference sensitivity, single crystal probe technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, use sound waves/ultrasonic waves/infrasonic waves for material analysis, and measurement devices, etc. It can solve the problem of differences, adjust reference sensitivity and determine transmission compensation. and other issues to achieve the effect of highlighting substantive characteristics

Inactive Publication Date: 2016-03-09
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test block method has many inconveniences in the on-site inspection: there may be steel plates to be inspected with different thicknesses on site; the surface conditions between the steel plates and between the steel plates and the test blocks are different; during the test, the probe, the connection line, and the personnel are changed. , After restarting the instrument after shutting down or working for a few hours, it is necessary to re-calibrate the detection sensitivity and perform transmission compensation
Therefore, on-site inspection must carry test blocks of different specifications, and it is very cumbersome to adjust the reference sensitivity and measure the transmission compensation. This is the deficiency of the existing technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] The method of using a single crystal probe to determine the reference sensitivity of steel plate flaw detection in this program includes the following steps:

[0021] 1) Select the test block according to the thickness of the steel plate to be measured, and the test block has a flat-bottomed hole with a diameter of 5 mm and a specified buried depth;

[0022] 2) Use the single crystal probe of the flaw detector to detect the maximum wave height △1dB value of the flat bottom hole of the test block; the single crystal probe is a manual flaw detection single crystal probe with a working frequency of 5MHz;

[0023] 3) Use the single crystal probe in step 2) to measure the △2dB value at the large flat bottom of the test block;

[0024] 4) Determine the correction value δ according to step 2) and step 3), δ=△1-△2;

[0025] 5) When performing flaw detection on the steel plate, adjust the bottom wave height of the intact part of the steel plate to 50% of the full scale of the f...

specific Embodiment approach 2

[0027] The method of using a single crystal probe to determine the reference sensitivity of steel plate flaw detection in this program includes the following steps:

[0028] 1) Select the test block according to the thickness of the steel plate to be measured, and the test block has a flat-bottomed hole with a diameter of 5 mm and a specified buried depth;

[0029] 2) Use the single crystal probe of the flaw detector to detect the maximum wave height △1dB value of the flat bottom hole of the test block; the single crystal probe is a manual flaw detection single crystal probe, and the working frequency is 2.5MHz;

[0030] 3) Use the single crystal probe in step 2) to measure the △2dB value at the large flat bottom of the test block;

[0031] 4) Determine the correction value δ according to step 2) and step 3), δ=△1-△2;

[0032] 5) When performing flaw detection on the steel plate, adjust the bottom wave height of the intact part of the steel plate to 50% of the full scale of t...

specific Embodiment approach 3

[0035] The method of using a single crystal probe to determine the reference sensitivity of steel plate flaw detection in this program includes the following steps:

[0036] 1) Select the test block according to the thickness of the steel plate to be measured, and the test block has a flat-bottomed hole with a diameter of 5 mm and a specified buried depth;

[0037] 2) Use the single crystal probe of the flaw detector to detect the maximum wave height △1dB value of the flat bottom hole of the test block; the single crystal probe is a manual flaw detection single crystal probe, and the working frequency is 2.5MHz;

[0038] 3) Use the single crystal probe in step 2) to measure the △2dB value at the large flat bottom of the test block;

[0039] 4) Determine the correction value δ according to step 2) and step 3), δ=△1-△2;

[0040] 5) When performing flaw detection on the steel plate, adjust the bottom wave height of the intact part of the steel plate to 50% of the full scale of t...

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Abstract

The invention provides the technical scheme of a method for determining flaw detection benchmark sensitivity of a steel plate by a single crystal probe. According to the technical scheme, the method comprises the following steps of: selecting a flat-bottomed test block with specified burial depth according to the thickness of a steel plate to be measured, detecting the largest wave height Delta 1dB of a flat bottom hole and the Delta 2dB value of the large flat bottom position of the test block by the single crystal probe, and determining the correction value delta; adjusting the bottom wave height on the intact steel plate part to be 50 percent of full scales of a flaw detector display screen in the process of performing flaw detection on the steel plate, gaining by delta dB, and determining the benchmark sensitivity of the steel plate, thus performing flaw detection on the steel plate on the basis of the benchmark sensitivity. A standard specified measuring defect is discovered in the detection process, the defect boundary is determined in a standard specified mode, the size or area of the defect is measured, and whether the steel plate is qualified or not is judged according to the length, the area and the area percent of the defect.

Description

technical field [0001] The invention relates to a method for determining the reference sensitivity of steel plate flaw detection by using a single crystal probe. Background technique [0002] In the prior art, the known technology is based on GB / T2970-2004 "Ultrasonic Testing Method for Thick Steel Plates" and JB / T4730-2005 "Nondestructive Testing of Pressure Equipment Part Three Ultrasonic Testing", for steel plates > 20mm, use For manual flaw detection of steel plates by pulse reflection ultrasonic flaw detector, a single crystal probe should be selected for flaw detection according to the thickness of the steel plate, the corresponding test block should be selected, and the detection sensitivity should be adjusted by using a flat bottom hole test block with a specified buried depth. The test block method has many inconveniences in the on-site inspection: there may be steel plates to be inspected with different thicknesses on site; the surface conditions between the ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/30
Inventor 司春杰侯文科黄伟东
Owner JIGANG GRP
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