Ultrasonic detection device and detection method for brazing quality of conduit

Abstract

The invention discloses a conduit brazing quality ultrasonic detection device and method, the device comprises a reference block, an ultrasonic flaw detector and a probe, the reference block comprises a first pipeline, a second pipeline and a sleeve brazing, the ultrasonic flaw detector is connected with the probe through a cable, and the probe is provided with a handle. Through the debugging assembly composed of the first pipeline, the second pipeline and other structures, the ultrasonic flaw detector can be debugged in advance, so that the device can be put into use accurately and quickly. The device is simple in structure and convenient to operate, can accurately and quickly detect and quantify the brazing quality of the brazing part of the guide pipe on a production site and on a machine, and is low in detection cost and free of radiation risk.

Description

Technical Field

[0001] This invention belongs to the field of nondestructive testing technology, and particularly relates to an ultrasonic testing device and method for testing the brazing quality of conduits. Background Technology

[0002] Currently, X-ray inspection is generally used to inspect the quality of brazing of conduits. However, the disadvantages are that the inspection cycle is long, the inspection cost is high, and it needs to be carried out in a protected room, making it difficult to conduct on the production site.

[0003] Patent application CN104359981A discloses an ultrasonic testing device and method for brazed joints of engine fuel mains pipes. This method employs a conical water jacket spray coupling method, which allows ultrasonic waves emitted from the probe to converge onto the pipe surface, thus reaching the weld joint. If defects exist at the weld joint, the defect signal can be identified by observing the waveform. However, this method is limited to use in drainage systems and is not suitable for on-site testing, nor can it quantitatively assess the size of detected defects relative to artificial defects.

[0004] Patent application CN111855806A discloses an ultrasonic testing method for brazing jumper wires in a generator. This method involves transmitting pulsed ultrasonic waves through a transducer to the object under test. The emitted pulsed ultrasonic waves pass through the object and are received by a receiving transducer. The strength of the received ultrasonic signal is used to determine the presence and severity of defects in the object under test. However, this method is unsuitable for testing brazing welds in hollow cylindrical conduits because it cannot detect existing weld defects. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an ultrasonic testing device and method for detecting the brazing quality of conduits.

[0006] The present invention is achieved through the following technical solutions.

[0007] The present invention provides an ultrasonic testing device for the brazing quality of a conduit, comprising a comparison test block, an ultrasonic flaw detector, and a probe. The comparison test block includes a sleeve, a first pipe, and a second pipe. The sleeve is respectively fitted onto the first pipe and the second pipe and brazed. The ultrasonic flaw detector is connected to the probe via a cable, and a handle is provided on the probe.

[0008] Preferably, a sleeve is fitted at the junction of the first pipe and the second pipe.

[0009] Preferably, a brazed joint is provided at the gap between the sleeve and the first and second pipes.

[0010] Preferably, a spacer is provided at the contact surface between the sleeve and the first pipe.

[0011] Preferably, the spacer is a mica sheet.

[0012] Preferably, a wafer is disposed on the probe, a delay block is mounted on one side of the wafer, and one side of the delay block is in contact with the sleeve.

[0013] Preferably, the side of the delay block that contacts the sleeve has a columnar concave arc.

[0014] Preferably, the delay block is made of plexiglass.

[0015] Preferably, the probe is provided with a blind hole, and a screw is provided in the blind hole, and the probe is connected to the handle by the screw.

[0016] The detection method of the above-mentioned detection device includes the following steps: S1: The spacer is set as an artificial defect. The brazing filler metal placed in the gap between the sleeve and the first and second pipes is heated. After the brazing filler metal melts, capillary action forms a brazed seam. S2: Use CT to inspect the brazed seams to ensure that there are no other unwelded areas except for man-made defects; S3: Adjust the detection sensitivity of the ultrasonic flaw detector. Connect the probe to the ultrasonic flaw detector via a cable. Turn on the ultrasonic flaw detector. Apply coupling agent to the detection area of ​​the comparison test block. Couple the probe to the artificial defect on the comparison test block. Adjust the ultrasonic flaw detector so that the wave height at the first mark is not less than 60% of the waveform scale and the wave height at the second mark is not less than 50% of the waveform scale. Then couple the probe to the part of the brazed seam on the comparison test block with complete brazing. Observe the waveform diagram of the ultrasonic flaw detector. If no echo appears at the first and second marks in the waveform diagram, it indicates that the brazed seam is complete. S4: Apply coupling agent to the area to be inspected in the brazed conduit. Couple the probe to the area to be inspected in the brazed conduit. Move the probe to scan around the circumference of the brazed conduit. At the same time, observe the waveform of the ultrasonic flaw detector. If an echo appears at the first and second marks on the waveform, and the echo height at the first mark exceeds 60% of the waveform scale, and the echo height at the second mark exceeds 50% of the waveform scale, it is judged as unqualified, and the brazed conduit has a defect. Otherwise, it is judged as qualified, and the brazed conduit has no defects or no defects exceeding the standard.

[0017] The beneficial effects of this invention are as follows: This invention utilizes a debugging assembly consisting of a first pipe and a second pipe to pre-calibrate an ultrasonic flaw detector, enabling the device to be accurately and quickly put into use. The invention features a simple structure and convenient operation, allowing for accurate and rapid inspection of the brazing quality of brazed parts of conduits on-site or on machine, with low inspection costs and no radiation risk. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure at the connection between the first pipe and the second pipe of the present invention; Figure 3 This is a schematic diagram of the waveform of an ultrasonic weld defect detection. Figure 4 This is a schematic diagram of the waveform of an ultrasonic weld that shows no defects. In the diagram: 1-First mark, 2-Second mark, 3-Sleeve, 4-Second pipe, 5-Ultrasonic flaw detector, 6-Cable, 7-Bramble, 8-Crystal, 9-Probe, 11-Delay block, 12-Artificial defect, 13-Handle, 14-Screw, 15-Comparison block, 16-First pipe. Detailed Implementation

[0019] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0020] Example: like Figures 1 to 4 As shown, an ultrasonic testing device for the brazing quality of a conduit includes a comparison test block 15, an ultrasonic flaw detector 5, and a probe 9. The comparison test block 15 is connected to a first pipe 16 and a second pipe 4 by a sleeve 3. One end of the first pipe 16 is connected to the second pipe 4. The ultrasonic flaw detector 5 is connected to the probe 9 via a cable 6. A handle 13 is provided on the probe 9.

[0021] The sleeve 3 is fitted at the junction of the first pipe 16 and the second pipe 4.

[0022] A brazing joint 7 is provided at the gap between the sleeve 3 and the first pipe 16 and the second pipe 4.

[0023] A mica spacer with dimensions of 1mm x 1mm is provided at the gap between the sleeve 3 and the first pipe 16.

[0024] The probe 9 is provided with a wafer 8, and an organic glass delay block 11 is installed on one side of the wafer 8. One side of the delay block 11 is in contact with the sleeve 3.

[0025] The delay block 11 is provided with a columnar concave arc on the side that contacts the sleeve 3, and the radius of curvature of the columnar concave arc of the delay block 11 is greater than the radius of curvature of the sleeve 3.

[0026] Blind holes are provided on both sides of the probe 9, and screws 14 are provided on the blind holes. The probe 9 is connected to the handle 13 through the screws 14. The front end of the handle 13 is Y-shaped. The handle 13 is connected to the screws 14 on both sides of the probe 9, which makes it easy for the probe 9 to rotate around the handle 13 at a small angle with the screws 14 as the axis, so that the delay block 11 can better fit the guide tube for detection.

[0027] A method for detecting the brazing quality of a conduit using an ultrasonic testing device includes the following steps: S1: Set the partition as an artificial defect 12, heat the brazing filler metal set in the gap between the sleeve and the first and second pipes, and after the brazing filler metal melts, capillary action forms a brazing seam, connecting the sleeve 3 with the first pipe 16 and the second pipe 4 into a whole; S2: Use CT to inspect the brazed seams to ensure that there are no other unwelded areas except for man-made defect 12; S3: Adjust the detection sensitivity of the ultrasonic flaw detector 5, connect the probe 9 to the ultrasonic flaw detector 5 through the cable 6, turn on the ultrasonic flaw detector 5, apply the coupling agent for ultrasonic testing to the detection area of ​​the comparison test block 15, couple the probe 9 to the artificial defect 12 on the comparison test block 15, adjust the ultrasonic flaw detector 5 so that the wave height at the first mark 1 is not less than 60% of the waveform scale, and the wave height at the second mark 2 is not less than 50% of the waveform scale, and then couple the probe 9 to the part of the brazed seam that is intact on the comparison test block 15, observe the waveform diagram of the ultrasonic flaw detector 5. If no echo appears at the first mark 1 and the second mark 2 in the waveform diagram, it indicates that the brazed seam is intact. S4: Apply coupling agent to the brazed portion of the conduit to be inspected. Couple probe 9 to the brazed portion and scan the area. Simultaneously observe the waveform of the ultrasonic flaw detector 5. If echoes appear at the first mark 1 and the second mark 2 on the waveform, and the echo height at the first mark 1 exceeds 60% of the waveform scale, and the echo height at the second mark 2 exceeds 50% of the waveform scale, the conduit is deemed unqualified, indicating a defect in the brazed portion. Figure 3 As shown; otherwise, it is considered qualified, and the brazed parts of the conduit are free of defects or have no defects exceeding the standard, such as Figure 4 As shown.

Claims

1. An ultrasonic testing device for the brazing quality of conduits, characterized in that: The test includes a comparison test block (15), an ultrasonic flaw detector (5), and a probe (9). The comparison test block (15) includes a sleeve (3), a first pipe (16), and a second pipe (4). The sleeve (3) is fitted onto the first pipe (16) and the second pipe (4) respectively and brazed. The ultrasonic flaw detector (5) is connected to the probe (9) via a cable (6). The probe (9) is equipped with a handle (13).

2. The ultrasonic testing device for the brazing quality of a conduit as described in claim 1, characterized in that: A sleeve (3) is attached at the junction of the first pipe (16) and the second pipe (4).

3. The ultrasonic testing device for the brazing quality of a conduit as described in claim 2, characterized in that: A brazing seam (7) is provided at the gap between the sleeve (3) and the first pipe (16) and the second pipe (4).

4. The ultrasonic testing device for the brazing quality of a conduit as described in claim 2, characterized in that: A spacer is provided at the gap between the sleeve (3) and the first pipe (16).

5. The ultrasonic testing device for the brazing quality of a conduit as described in claim 4, characterized in that: The spacer is a mica sheet.

6. The ultrasonic testing device for the brazing quality of a conduit as described in claim 1, characterized in that: The probe (9) is provided with a chip (8), and a delay block (11) is installed on one side of the chip (8). The delay block (11) has an arc that contacts the sleeve (3).

7. The ultrasonic testing device for the brazing quality of a conduit as described in claim 6, characterized in that: The delay block (11) is provided with a columnar concave arc on the side that contacts the sleeve (3).

8. The ultrasonic testing device for the brazing quality of a conduit as described in claim 6, characterized in that: The delay block (11) is made of plexiglass.

9. The ultrasonic testing device for the brazing quality of a conduit as described in claim 1, characterized in that: The probe (9) is provided with a blind hole, and a screw (14) is provided on the blind hole. The probe (9) is connected to the handle (13) through the screw (14).

10. A detection method using the detection apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Set the partition as an artificial defect (12), heat the brazing filler metal set in the gap between the sleeve (3) and the first pipe (16) and the second pipe (4) to form a brazing weld (7). S2: Use CT to inspect the brazed seam to ensure that there are no other unwelded parts except for man-made defects (12); S3: Adjust the detection sensitivity of the ultrasonic flaw detector (5), connect the probe (9) to the ultrasonic flaw detector (5) through the cable (6), turn on the ultrasonic flaw detector (5), apply coupling agent to the detection area of ​​the comparison test block (15), couple the probe (9) to the artificial defect (12) on the comparison test block (15), adjust the ultrasonic flaw detector (5) so that the wave height at the first mark (1) is not less than 60% of the waveform chart scale, and the wave height at the second mark (2) is not less than 50% of the waveform chart scale. Then couple the probe (9) to the part of the brazed seam that is intact on the comparison test block (15), observe the waveform diagram of the ultrasonic flaw detector (5). If no echo appears at the first mark (1) and the second mark (2) in the waveform diagram, it indicates that the brazed seam is intact. S4: Apply coupling agent to the area to be inspected in the brazed conduit, couple the probe (9) to the area to be inspected in the brazed conduit, move the probe (9) to rotate around the circumference of the brazed conduit to scan, and at the same time observe the waveform of the ultrasonic flaw detector (5). If an echo appears at the first mark (1) and the second mark (2) of the waveform, and the echo height at the first mark (1) exceeds 60% of the waveform scale, and the echo height at the second mark (2) exceeds 50% of the waveform scale, then it is judged as unqualified, and the brazed conduit has a defect. Otherwise, it is judged as qualified, and the brazed conduit has no defect or no defect exceeding the standard.

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