A device and a detection method for high temperature ultrasonic detection

Abstract

The present invention provides a device and a detection method for high-temperature ultrasonic detection. The device for high-temperature ultrasonic detection comprises an ultrasonic probe; a pulse generator for generating ultrasonic pulses; a receiving amplifier for receiving and amplifying reflected signals; a position correction module for correcting the position information of defect reflected signals according to the law of sound velocity change at the actual detection temperature; a sensitivity correction module for correcting the defect reflected signals according to the attenuation law and coupling compensation of the ultrasonic beam at the actual detection temperature; and an oscilloscope for receiving and displaying the corrected reflected signals. The device for high-temperature ultrasonic detection in the present invention is added with an echo positioning correction module and a sensitivity correction module. Before detection, only the temperature and wall thickness of the workpiece need to be set, and the sound path and sensitivity of the reflected echo can be effectively corrected according to the temperature of the workpiece, thereby solving the problems of defect positioning deviation and low sensitivity in ultrasonic high-temperature detection.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic flaw detection, and in particular relates to a device and a detection method for high-temperature ultrasonic detection. Background Art

[0002] Ultrasonic testing technology has been widely used in the inspection of pressure vessels. Its specific principle is to use ultrasonic waves to pass through a medium. When encountering another medium, it will reflect back to the source. By analyzing these reflections, the thickness of the product can be measured, or cracks or other hidden defects in the product can be found. Ultrasonic testing is often used to detect internal buried defects of workpieces. It has the advantages of accurate defect positioning, high sensitivity, and convenient use. It is the most commonly used detection method in the industrial field.

[0003] However, ultrasonic testing is usually carried out at room temperature. Once the workpiece is at high temperature, the physical properties of ultrasonic wave propagation speed, direction, attenuation, etc. will change from those at room temperature, which will lead to poor accuracy and sensitivity of ultrasonic testing at high temperature. Manual calculation and correction are time-consuming and laborious, which is extremely inconvenient. As the temperature of the workpiece increases, the speed and propagation direction of ultrasonic waves change, affecting the detection accuracy; ultrasonic waves are abnormally attenuated compared to normal temperature, affecting the detection sensitivity.

[0004] In the prior art, a Chinese invention patent application with publication number CN110441389A discloses an ultrasonic detection method for large-pipe fillet welds of high-pressure vessels, which detects the welds at room temperature without the influence of temperature changes.

[0005] Another example is the Chinese utility model patent document with authorization announcement number CN216247806U, which discloses a gas cylinder ultrasonic flaw detector, which mainly records the mechanical structure for detecting the gas cylinder. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a device for high-temperature ultrasonic testing that can solve the problem of high-temperature online testing accuracy for pressure vessels.

[0007] The technical solution of the present invention is:

[0008] An apparatus for high temperature ultrasonic testing, comprising:

[0009] An ultrasonic probe is used to convert an ultrasonic pulse signal into an ultrasonic wave transmitted to a workpiece, and at the same time convert a reflected echo reflected from the workpiece into a reflected signal;

[0010] A pulse generator, used for generating ultrasonic pulses for driving the ultrasonic probe;

[0011] A receiving amplifier, used for receiving and amplifying the reflected signal;

[0012] The position correction module corrects the position information of the defect reflection signal according to the law of sound velocity change under the actual detection temperature;

[0013] The sensitivity correction module corrects the defect reflection signal according to the attenuation law and coupling compensation of the ultrasonic beam at the actual detection temperature; and

[0014] The oscilloscope device receives and displays the reflected signal corrected by the position correction module and the sensitivity correction module.

[0015] S is used to represent the corrected sound path value, and the corrected sound path value S is corrected using the following formula:

[0016]

[0017] Where S' is the measured sound path value in mm, and T is the workpiece temperature during detection in °C.

[0018] Y is used to represent the sensitivity that should be increased, and the sensitivity Y that should be increased is corrected using the following formula:

[0019] Y=1.8×10 -4 ×T×S+2.7×10 -2 ×T+4

[0020] Where T is the workpiece temperature during testing, in °C, and S is the corrected sound path value, in mm.

[0021] The detection method for high temperature ultrasonic detection comprises the following steps:

[0022] The ultrasonic probe converts the ultrasonic pulse into an ultrasonic wave and transmits it to the workpiece. At the same time, the ultrasonic probe converts the received reflected echo into a reflected signal.

[0023] The receiving amplifier is used to receive and amplify the reflected signal sent by the ultrasonic probe, and output the measured sound path value S';

[0024] Get the temperature value T of the workpiece;

[0025] According to the formula Calculate the corrected sound path value S;

[0026] According to the formula Y = 1.8 × 10 -4 ×T×S+2.7×10 -2 ×T+4, calculate the sensitivity Y that should be increased after correction;

[0027] The oscilloscope device displays the corrected reflected wave signal according to the corrected sound path value S and the sensitivity Y that should be increased.

[0028] Beneficial effects of the present invention:

[0029] (1) The device for high-temperature ultrasonic testing in the present invention adds an echo positioning correction module and a sensitivity correction module on the basis of the traditional ultrasonic testing equipment. Before testing, it is only necessary to set the workpiece temperature and wall thickness, and the acoustic path and sensitivity of the reflected echo can be effectively corrected according to the workpiece temperature, thereby solving the problems of defect positioning deviation and low sensitivity in ultrasonic high-temperature testing.

[0030] (2) The device and method for high-temperature ultrasonic detection in the present invention solve the problem of high-temperature online detection accuracy of pressure vessels, which can greatly reduce the maintenance cost of high-temperature equipment and has very considerable economic benefits and broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a principle block diagram of the device used for high-temperature ultrasonic detection in the present invention. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0033] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] like Figure 1As shown, the device for high-temperature ultrasonic testing includes: an ultrasonic probe, which is used to convert an ultrasonic pulse signal into an transmitted ultrasonic wave emitted to a workpiece, and at the same time convert a reflected echo reflected by the workpiece into a reflected signal; a pulse generator, which is used to generate an ultrasonic pulse to drive the ultrasonic probe; a receiving amplifier, which is used to receive and amplify the reflected signal; a position correction module, which corrects the position information of the defect reflection signal according to the law of sound speed change at the actual detection temperature; a sensitivity correction module, which corrects the defect reflection signal according to the attenuation law of the ultrasonic beam at the actual detection temperature and coupling compensation; and an oscilloscope device, which receives and displays the reflected signal corrected by the position correction module and the sensitivity correction module; in this embodiment, the pulse generator generates a pulse signal, and an ultrasonic beam is generated by the ultrasonic probe to enter the workpiece, and a reflected echo is generated when encountering a defect, and the reflected echo is received by the receiving amplifier. The receiving amplifier amplifies the signal, the position correction module corrects the position information of the defect reflection signal according to the sound speed change law under the actual detected workpiece temperature, and the sensitivity correction module corrects the defect reflection signal according to the attenuation law and coupling compensation of the ultrasonic beam under the actual detection temperature, and finally outputs the corrected reflected wave signal on the oscilloscope device; on the basis of traditional ultrasonic detection equipment, an echo positioning correction module and a sensitivity correction module are added. Before detection, only the workpiece temperature and wall thickness need to be set, and the sound path and sensitivity of the reflected echo can be effectively corrected according to the temperature of the workpiece, which solves the problems of defect positioning deviation and low sensitivity of ultrasonic high-temperature detection; the device for high-temperature ultrasonic detection in this embodiment solves the problem of high-temperature online detection accuracy of pressure vessels, which can greatly reduce the maintenance cost of high-temperature equipment, and has very considerable economic benefits and broad market application prospects.

[0035] In the above embodiment, as the temperature of the inspected workpiece increases, the sound velocity and sound propagation direction of the ultrasonic wave change, which affects the detection accuracy. As a specific implementation method of correcting the reflected echo sound path value S, S is used to represent the corrected sound path value, and the corrected sound path value S is corrected using the following formula:

[0036]

[0037] Where S' is the measured sound path value, T is the workpiece temperature value during detection, the unit is ℃, and the unit of the corrected sound path value S is mm.

[0038] In the above embodiment, due to factors such as interface attenuation and high-temperature material attenuation, the reflected echo under high temperature conditions is much lower than the value at normal temperature, so the sensitivity needs to be corrected. As a specific implementation method of the correction of the sensitivity Y to be increased, Y is used to represent the sensitivity to be increased, and the sensitivity Y to be increased is corrected using the following formula:

[0039] Y=1.8×10 -4×T×S+2.7×10 -2 ×T+4

[0040] Where T is the workpiece temperature during detection, in °C, S is the corrected sound path value, in mm, and the sensitivity Y to be increased is in dB.

[0041] In some embodiments, a detection method for high temperature ultrasonic detection is disclosed, comprising the following steps:

[0042] The ultrasonic probe converts the ultrasonic pulse into an ultrasonic wave and transmits it to the workpiece. At the same time, the ultrasonic probe converts the received reflected echo into a reflected signal.

[0043] The receiving amplifier is used to receive and amplify the reflected signal sent by the ultrasonic probe, and output the measured sound path value S';

[0044] Get the temperature value T of the workpiece;

[0045] According to the formula Calculate the corrected sound path value S;

[0046] According to the formula Y = 1.8 × 10 -4 ×T×S+2.7×10 -2 ×T+4, calculate the sensitivity Y that should be increased after correction;

[0047] The oscilloscope device displays the corrected reflected wave signal according to the corrected sound path value S and the sensitivity Y that should be increased.

[0048] The detection method for high-temperature ultrasonic detection in the present invention adds an echo positioning correction module and a sensitivity correction module on the basis of traditional ultrasonic detection equipment. Before detection, it is only necessary to set the workpiece temperature and wall thickness, and the sound path and sensitivity of the reflected echo can be effectively corrected according to the temperature of the workpiece, thereby solving the problems of defect positioning deviation and low sensitivity in ultrasonic high-temperature detection; solving the problem of high-temperature online detection accuracy of pressure vessels, and can greatly reduce the maintenance cost of high-temperature equipment, which has very considerable economic benefits and broad market application prospects.

[0049] In the above embodiments, the temperature of the workpiece can be measured by a contact or non-contact temperature measuring device, wherein the contact temperature measuring device is such as a temperature sensor probe, etc., and the non-contact temperature measuring device is such as an infrared temperature measuring gun, etc.

[0050] In the above embodiment, the ultrasonic probe may be a high-temperature ultrasonic probe.

[0051] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0052] The above-mentioned embodiments only express some implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A detection method for high temperature ultrasonic detection, characterized in that: The following steps are involved: The ultrasonic probe converts the ultrasonic pulse into an ultrasonic wave and transmits it to the workpiece. At the same time, the ultrasonic probe converts the received reflected echo into a reflected signal. The receiving amplifier is used to receive and amplify the reflected signal sent by the ultrasonic probe, and output the measured sound path value S'; Get the temperature value T of the workpiece; According to the formula Calculate the corrected sound path value S; According to the formula Y = 1.8 × 10 -4 ×T×S+2.7×10 -2 ×T+4, calculate the sensitivity Y that should be increased after correction; The oscilloscope device displays the corrected reflected wave signal according to the corrected sound path value S and the sensitivity Y that should be increased.

Images