Ultrasonic flaw detection method and device for rail weld joints

Abstract

The present invention provides a method and apparatus for ultrasonic flaw detection of rail welded joints, which relates to the field of rail welding. An ultrasonic flaw detection device moves along the length of the rail and passes through a welded joint. The ultrasonic flaw detection device moves in one direction and forms a first detection trajectory, and then moves in the opposite direction and forms a second detection trajectory. While moving along the first detection trajectory, the ultrasonic flaw detection device performs ultrasonic testing on one side of the rail, and while moving along the second detection trajectory, the ultrasonic flaw detection device performs ultrasonic testing on the other side of the rail. The ultrasonic flaw detection method and apparatus for ultrasonic flaw detection of rail welded joints proposed by the present invention, through reasonable probe layout, selection, and precise calculation, can achieve efficient testing of joint welds.

Description

Technical Field

[0001] The present invention relates to the field of rail welding, and in particular to an ultrasonic flaw detection method and device for rail welded joints. Background Art

[0002] Rail welded joints are a crucial component of seamless railway systems, and their internal quality is crucial for ensuring the safe operation of high-speed railways. During rail welding production, one method for assessing joint internal quality is ultrasonic testing. Every joint undergoes ultrasonic testing to ensure that no defects exceed specified standards. Only joints that meet standard requirements after ultrasonic testing are released for use.

[0003] In the prior art, a small scanning device is used to perform ultrasonic inspection on welded joints. The scanning device can be used for factory or base welds, and can perform K-type scanning on the rail head, rail waist and rail bottom. Specifically, three ultrasonic probes are installed on the front and rear sides of the scanning frame of the scanning device, and the relative positions of the probes on each side are fixed. The transmission mechanism moves the probes on the front and rear sides in a certain positional relationship, so that the ultrasonic waves emitted by the probe on one side are directed to the weld of the rail joint and then reflected back to the probe on the other side. The signal received by each probe can be recognized by the data acquisition equipment and converted into a digital signal to be displayed on the computer software in a way that can identify defects. Although the scanning device can basically meet the requirements of the standard, this simple scanning frame has the disadvantages of small detection coverage, low detection efficiency and low degree of automation.

[0004] In view of this, the inventor, based on many years of production design experience in this field and related fields, has designed an ultrasonic flaw detection method and device for rail weld joints after repeated experiments, in order to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for ultrasonic flaw detection of rail welded joints, which can complete efficient detection of joint welds through reasonable probe layout, selection and accurate calculation.

[0006] To achieve the above-mentioned objectives, the present invention proposes a method for ultrasonic flaw detection of rail weld joints, wherein an ultrasonic flaw detection device moves along the length direction of the rail and passes through a weld joint. The ultrasonic flaw detection device moves in one direction and forms a first detection track, and the ultrasonic flaw detection device moves in the opposite direction and forms a second detection track. When moving along the first detection track, the ultrasonic flaw detection device performs ultrasonic testing on one side of the rail, and when moving along the second detection track, the ultrasonic flaw detection device performs ultrasonic testing on the other side of the rail.

[0007] In the ultrasonic flaw detection method for rail weld joints as described above, the first detection track and the second detection track overlap.

[0008] In the ultrasonic flaw detection method for rail weld joints as described above, when moving along the first detection track, the ultrasonic flaw detection device simultaneously performs ultrasonic detection on the rail head, top surface and side surface of one side of the rail.

[0009] In the ultrasonic flaw detection method for rail weld joints as described above, when moving along the second detection track, the ultrasonic flaw detection device simultaneously performs ultrasonic detection on the rail head, top surface and side surface of the other side of the rail.

[0010] In the ultrasonic flaw detection method for rail weld joints as described above, the ultrasonic signal obtained by ultrasonic detection is displayed as a readable digital signal by a signal processing device.

[0011] The present invention also proposes an ultrasonic flaw detection device for rail weld joints, wherein the ultrasonic flaw detection device includes a fixed bracket and a movable bracket, the fixed bracket and the movable bracket are respectively arranged on both sides of the rail, and the movable bracket can move back and forth along the length direction of the rail. The ultrasonic flaw detection device also includes at least one group of first ultrasonic probe groups and at least one group of second ultrasonic probe groups, the first ultrasonic probe group has at least a first transmitting ultrasonic probe and a first receiving ultrasonic probe, the second ultrasonic probe group has at least a second transmitting ultrasonic probe and a second receiving ultrasonic probe, the first transmitting ultrasonic probe is installed on the movable bracket, the first receiving ultrasonic probe is installed on the fixed bracket, the second transmitting ultrasonic probe is installed on the fixed bracket, and the second receiving ultrasonic probe is installed on the movable bracket.

[0012] The ultrasonic flaw detection device for rail weld joints as described above, wherein the ultrasonic flaw detection device includes three groups of the first ultrasonic probe groups, which are the rail head first ultrasonic probe group, the top surface first ultrasonic probe group and the bottom surface first ultrasonic probe group.

[0013] The ultrasonic flaw detection device for rail weld joints as described above, wherein the ultrasonic flaw detection device includes three groups of second ultrasonic probe groups, which are respectively a rail head second ultrasonic probe group, a top surface second ultrasonic probe group and a bottom surface second ultrasonic probe group.

[0014] In the ultrasonic flaw detection device for rail welded joints as described above, the ultrasonic probe is mounted on the bracket via a retractable cylinder, and when the cylinder is extended, the ultrasonic probe is brought close to the rail.

[0015] The ultrasonic flaw detection device for rail weld joints as described above, wherein the ultrasonic flaw detection device also includes a signal processor, which is electrically connected to the first ultrasonic probe group and the second ultrasonic probe group. The signal processor receives the ultrasonic signals of the first ultrasonic probe group and the second ultrasonic probe group and processes them into readable digital signals.

[0016] Compared with the prior art, the present invention has the following characteristics and advantages:

[0017] The present invention proposes an ultrasonic flaw detection method and an ultrasonic flaw detection device for rail weld joints. The ultrasonic flaw detection device forms a first detection track and a second detection track through the reciprocating movement of its movable bracket. After the movable bracket goes through a forward and reverse movement cycle, each ultrasonic probe completes the collection of flaw detection data on the left and right sides of the rail. The position and direction of the ultrasonic flaw detection device do not need to be manually moved during the entire flaw detection and measurement process. This not only greatly reduces the labor intensity of the operators, but also greatly improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0019] Figure 1 This is a schematic structural diagram of the ultrasonic flaw detection device for rail weld joints proposed by the present invention;

[0020] Figure 2 is a cross-sectional view of the rail of the present invention;

[0021] Figure 3 Schematic diagram of the installation of each ultrasonic probe in the present invention (1);

[0022] Figure 4 Schematic diagram of the installation of each ultrasonic probe in the present invention (II);

[0023] Figure 5-1 This is an ultrasonic circuit diagram (1) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the left side of the rail;

[0024] Figure 5-2 This is the ultrasonic circuit diagram (2) when the ultrasonic flaw detection device of the present invention performs ultrasonic flaw detection on the left side of the rail;

[0025] Figure 5-3 This is the ultrasonic circuit diagram (3) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the left side of the rail;

[0026] Figure 5-4 This is an ultrasonic circuit diagram (four) when the ultrasonic flaw detection device of the present invention performs ultrasonic flaw detection on the left side of the rail;

[0027] Figure 5-5 The ultrasonic circuit diagram (V) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the left side of the rail;

[0028] Figure 5-6 The ultrasonic circuit diagram (six) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the left side of the rail;

[0029] Figure 6-1 This is an ultrasonic circuit diagram (1) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the right side of the rail;

[0030] Figure 6-2 This is the ultrasonic circuit diagram (2) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the right side of the rail;

[0031] Figure 6-3 This is the ultrasonic circuit diagram (3) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the right side of the rail;

[0032] Figure 6-4 This is an ultrasonic circuit diagram (four) when the ultrasonic flaw detection device of the present invention performs ultrasonic flaw detection on the right side of the rail;

[0033] Figure 6-5 This is an ultrasonic circuit diagram (V) of the ultrasonic flaw detection device of the present invention when performing ultrasonic flaw detection on the right side of the rail;

[0034] Figure 6-6 This is the ultrasonic circuit diagram (6) when the ultrasonic flaw detection device in the present invention performs ultrasonic flaw detection on the right side of the rail.

[0035] Description of reference numerals:

[0036] 100. Ultrasonic flaw detection device; 110. Fixed bracket;

[0037] 120. Mobile bracket; 130. First ultrasound probe assembly;

[0038] 131. A first transmitting ultrasound probe; 132. A first receiving ultrasound probe;

[0039] 140. A second ultrasonic probe group; 141. A second transmitting ultrasonic probe;

[0040] 142. Second receiving ultrasonic probe; 150. Cylinder;

[0041] 200. Steel rails; 210. Welded joints. DETAILED DESCRIPTION

[0042] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, a skilled person can conceive of any possible variations based on the present invention, and such variations should be considered to fall within the scope of the present invention.

[0043] like Figures 1 to 6-6 As shown, the present invention provides an ultrasonic flaw detection method for rail weld joints. An ultrasonic flaw detection device 100 moves along the length of a rail 200 and passes through a weld joint 210. The ultrasonic flaw detection device 100 moves in one direction and forms a first detection track. The ultrasonic flaw detection device 100 moves in the opposite direction and forms a second detection track. When moving along the first detection track, the ultrasonic flaw detection device 100 performs ultrasonic testing on one side of the rail 200. When moving along the second detection track, the ultrasonic flaw detection device 100 performs ultrasonic testing on the other side of the rail 200.

[0044] The present invention also proposes an ultrasonic flaw detection device 100 for rail weld joints, the ultrasonic flaw detection device 100 includes a fixed bracket 110 and a movable bracket 120, the fixed bracket 110 and the movable bracket 120 are respectively arranged on both sides of the rail 200, and the movable bracket 120 can move back and forth along the length direction of the rail 200. The ultrasonic flaw detection device 100 also includes at least one group of first ultrasonic probe groups 130 and at least one group of second ultrasonic probe groups 140, the first ultrasonic probe group 130 has at least a first transmitting ultrasonic probe 131 and a first receiving ultrasonic probe 132, the second ultrasonic probe group 140 has at least a second transmitting ultrasonic probe 141 and a second receiving ultrasonic probe 142, the first transmitting ultrasonic probe 131 is installed on the movable bracket 120, the first receiving ultrasonic probe 132 is installed on the fixed bracket 110, the second transmitting ultrasonic probe 141 is installed on the fixed bracket 110, and the second receiving ultrasonic probe 142 is installed on the movable bracket 120.

[0045] The present invention proposes an ultrasonic flaw detection method and ultrasonic flaw detection device 100 for rail weld joints. The ultrasonic flaw detection device 100 forms a first detection track and a second detection track through the reciprocating movement of its movable bracket 120. After the movable bracket 120 goes through a forward and reverse movement cycle, each ultrasonic probe completes the collection of flaw detection data on the left and right sides of the rail 200. The position and direction of the ultrasonic flaw detection device 100 do not need to be manually moved during the entire flaw detection and measurement process. This not only greatly reduces the labor intensity of the operator, but also greatly improves the detection efficiency.

[0046] In an optional embodiment of the present invention, the first and second detection trajectories overlap. Specifically, the mobile support 120 moves a certain distance along the length of the rail 200 to form the first detection trajectory. The mobile support 120 then moves the same distance in the opposite direction to form the second detection trajectory. It should be noted that both the first and second detection trajectories pass through the weld joint 210 to be measured. Specifically, the endpoints of the movement distance of the mobile support 120 are located on either side of the weld joint 210.

[0047] In an optional embodiment of the present invention, when moving along the first detection track, the ultrasonic flaw detection device 100 simultaneously performs ultrasonic detection on the rail head, top surface and side surface of one side of the rail 200.

[0048] In an optional example of this embodiment, the ultrasonic flaw detection device 100 includes three first ultrasonic probe groups 130: a rail head first ultrasonic probe group, a top surface first ultrasonic probe group, and a bottom surface first ultrasonic probe group. With this structure, the movable bracket 12 can simultaneously perform ultrasonic testing on the rail head, top surface, and side surfaces with a single movement, significantly improving testing efficiency.

[0049] In an optional embodiment of the present invention, when moving along the second detection track, the ultrasonic flaw detection device 100 simultaneously performs ultrasonic detection on the rail head, top surface and side surface of the other side of the rail 200.

[0050] In an optional example of this embodiment, the ultrasonic flaw detection device 100 includes three groups of second ultrasonic probe groups 140, which are a rail head second ultrasonic probe group, a top surface second ultrasonic probe group and a bottom surface second ultrasonic probe group.

[0051] In the present invention, the first transmitting ultrasonic probe 131 and the first receiving ultrasonic probe 132 in the first ultrasonic probe group at the rail head are respectively located on both sides of the rail head, the first transmitting ultrasonic probe 131 and the first receiving ultrasonic probe 132 in the first ultrasonic probe group on the bottom surface are respectively located on both sides of the rail bottom, and the first transmitting ultrasonic probe 131 and the first receiving ultrasonic probe 132 in the first ultrasonic probe group on the top surface are respectively located at the top surface of the rail head and are spaced apart along the length direction of the rail; accordingly, the second transmitting ultrasonic probe 141 and the second receiving ultrasonic probe 142 in the second ultrasonic probe group at the rail head are respectively located on both sides of the rail head, the second transmitting ultrasonic probe 141 and the second receiving ultrasonic probe 142 in the second ultrasonic probe group on the bottom surface are respectively located on both sides of the rail bottom, and the second transmitting ultrasonic probe 141 and the second receiving ultrasonic probe 142 in the second ultrasonic probe group on the top surface are respectively located at the top surface of the rail head and are spaced apart along the length direction of the rail.

[0052] In an optional example of this embodiment, each ultrasonic probe is mounted on the fixed bracket 110 or the movable bracket 120 via a retractable cylinder. When the cylinder is extended, the ultrasonic probe is brought into close proximity with the rail 200. With this structure, the specific position of each ultrasonic probe can be adjusted by the extension distance of the cylinder, allowing the ultrasonic flaw detection device 100 to adapt to rails of different specifications.

[0053] In an optional embodiment of the present invention, the ultrasonic signal obtained by ultrasonic detection is displayed as a readable digital signal by a signal processing device.

[0054] Specifically, the ultrasonic flaw detection device 100 includes a signal processor, which is electrically connected to the first ultrasonic probe group 130 and the second ultrasonic probe group 140. The signal processor receives ultrasonic signals from the first ultrasonic probe group 130 and the second ultrasonic probe group 140 and processes them into readable digital signals.

[0055] In an optional embodiment of the present invention, the ultrasonic flaw detection device 100 includes a data processing unit, which is used to store and process the digital signal derived by the signal processor and display it.

[0056] Please refer to Figures 1 to 6-6 Now, in conjunction with an embodiment, the working principle and specific implementation process of the ultrasonic flaw detection method for rail weld joints and the ultrasonic flaw detection device 100 proposed in the present invention are described in detail.

[0057] like Figure 1 As shown, the ultrasonic flaw detection device 100 comprises three first ultrasonic probe groups 130, three second ultrasonic probe groups 140 (the first transmitting ultrasonic probe 131, the first receiving ultrasonic probe 132, the second transmitting ultrasonic probe 141 and the second receiving ultrasonic probe 142 are all K1 oblique probes), a cylinder 150, a fixed bracket 110, a movable bracket 120 and a signal processor ( Figure 1 It consists of a data processing unit (not shown) and a data processing unit (software).

[0058] The fixed bracket 110 and the movable bracket 120 serve as the main rigid structures for installing the ultrasonic probes and the cylinder 150 , and can drive the ultrasonic probes and the cylinder 150 to approach the inspected rail and perform linear reciprocating motion along the width direction of the mounting bracket.

[0059] The first transmitting ultrasonic probe 131 and the second transmitting ultrasonic probe 141 are used to transmit ultrasonic signals and transmit the signals to a signal processing device. The first receiving ultrasonic probe 132 and the second receiving ultrasonic probe 142 are used to receive ultrasonic signals and transmit the signals to a signal processor. The signal processor can process the signals into digital signals readable by software, which are ultimately displayed by software (data processing unit).

[0060] Figure 2 The main dimensions of the cross section of the rail 200 to be tested are shown in FIG. 1 . In this embodiment, the rail height is 176 mm, the rail head width is 71 mm, and the rail bottom width is 150 mm. Figure 3 、 Figure 4 , the calculation process of each probe layout size is as follows:

[0061] 1) Design of rail top probe spacing, spacing between the first receiving ultrasonic probe 132 (A4) and the second receiving ultrasonic probe 142 (B4), spacing between the first transmitting ultrasonic probe 131 (A3) and the second transmitting ultrasonic probe 141 (B3): The ultrasonic propagation at the rail top bounces twice, see Figure 4 Among them, the rail height (H) = 176mm; the ultrasonic emission angle is 45°; the probe length (L) = 20mm; in order to make the ultrasonic scanning route cover the rail height of 176mm, the maximum center distance between the two probes B3 and B4 or A3 and A4 is required to be 2H×tan45°=352mm, and the minimum distance L=20mm; at this time, Figure 1 The center distance between the probes of the movable bracket 120 is: H×tan45°-L / 2=166mm, and the center distance between the probes of the fixed bracket 110 is: 2×H×tan45°+H×tan45°-L / 2+L=538mm.

[0062] 2) The ultrasonic propagation of the first ultrasonic probe group at the rail head (the second ultrasonic probe group at the rail head) and the first ultrasonic probe group at the rail bottom (the second ultrasonic probe group at the rail bottom) is reflected once. Figure 5-1 to Figure 5-6 The distance between each transmitting probe and receiving probe in each probe group can be obtained using the same calculation method.

[0063] According to the calculation results of each first ultrasonic probe group 130 and each second ultrasonic probe group 140, a probe layout dimension diagram is obtained, see Figure 3 、 Figure 4 .

[0064] The ultrasonic flaw detection method and ultrasonic flaw detection device 100 for rail welded joints are implemented as follows: All probes on the fixed bracket 110 and the movable bracket 120 are driven by the corresponding cylinders 150 to stick to the surface of the rail 200 to be tested. At this time, the position relationship of each probe is as follows: Figure 4 As shown, the first receiving ultrasonic probe 132 (A2, A4, A6) and the second transmitting ultrasonic probe 141 (B2, B4, B6) mounted on the fixed support 110 scan rightward as the flaw detection frame is driven; the first transmitting ultrasonic probe 131 (A1, A3, A5) and the second receiving ultrasonic probe 142 (B1, B3, B5) mounted on the movable support 120 scan leftward as the movable support 120 is driven until the second receiving ultrasonic probe 142 (B4) and the second transmitting ultrasonic probe 141 (B3) touch each other.

[0065] This detection process is only used for the B1, B2, B3, B4, B5 and B6 probes for flaw detection on the left side of the rail 200. At this time, the equipment can obtain the flaw detection signal on the left side of the rail 200. The ultrasonic scanning route diagram of the ultrasonic probe in this process is as follows Figure 4 As shown, the scanning data on the left side is obtained. After the above action is completed, the mobile bracket 120 changes the moving direction. At this time, the A1, A2, A3, A4, A5 and A6 probes used for flaw detection on the right side of the rail 200 are started. At this time, the ultrasonic scanning route map of the ultrasonic probe is as follows: Figure 6-1 to Figure 6-6 shown.

[0066] After the movable bracket 120 has gone through a forward and reverse movement cycle, each ultrasonic probe completes the collection of left and right flaw detection data, that is, the left and right flaw detection of the weld joint 210 is completed.

[0067] The detailed explanations of the above-mentioned embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limiting the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless otherwise clearly described, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A method for ultrasonic flaw detection of rail weld joints, using an ultrasonic flaw detection device for flaw detection, characterized in that: The ultrasonic flaw detection device includes a fixed support and a movable support, the fixed support and the movable support are respectively arranged on both sides of the rail, and the movable support can reciprocate along the length direction of the rail. The ultrasonic flaw detection device also includes at least one first ultrasonic probe group and at least one second ultrasonic probe group, the first ultrasonic probe group includes at least a first transmitting ultrasonic probe and a first receiving ultrasonic probe, and the second ultrasonic probe group includes at least a second transmitting ultrasonic probe and a second receiving ultrasonic probe, the first transmitting ultrasonic probe is mounted on the movable support, the first receiving ultrasonic probe is mounted on the fixed support, the second transmitting ultrasonic probe is mounted on the fixed support, and the second receiving ultrasonic probe is mounted on the movable support. The movable support moves along the length direction of the rail and passes through a weld joint. The movable support moves in one direction and forms a first detection track, and the movable support moves in the opposite direction and forms a second detection track. The first detection track and the second detection track overlap. When moving along the first detection track, the ultrasonic flaw detection device performs ultrasonic testing on one side of the rail, and when moving along the second detection track, the ultrasonic flaw detection device performs ultrasonic testing on the other side of the rail.

2. The ultrasonic flaw detection method for rail weld joints according to claim 1, characterized in that: When moving along the first detection track, the ultrasonic flaw detection device simultaneously performs ultrasonic detection on the rail head, top surface and side surface of one side of the rail.

3. The ultrasonic flaw detection method for rail weld joints according to claim 1, characterized in that: When moving along the second detection track, the ultrasonic flaw detection device simultaneously performs ultrasonic detection on the rail head, top surface and side surface of the other side of the rail.

4. The ultrasonic flaw detection method for rail weld joints according to claim 1, wherein: The ultrasonic signal obtained by ultrasonic testing is displayed as a readable digital signal by a signal processing device.

5. An ultrasonic flaw detection device for rail weld joints, characterized in that: The ultrasonic flaw detection device includes a fixed bracket and a movable bracket, the fixed bracket and the movable bracket are respectively arranged on both sides of the rail, and the movable bracket can reciprocate along the length direction of the rail. The ultrasonic flaw detection device also includes at least one first ultrasonic probe group and at least one second ultrasonic probe group, the first ultrasonic probe group includes at least a first transmitting ultrasonic probe and a first receiving ultrasonic probe, and the second ultrasonic probe group includes at least a second transmitting ultrasonic probe and a second receiving ultrasonic probe, the first transmitting ultrasonic probe is mounted on the movable bracket, the first receiving ultrasonic probe is mounted on the fixed bracket, the second transmitting ultrasonic probe is mounted on the fixed bracket, and the second receiving ultrasonic probe is mounted on the movable bracket; The movable bracket moves a certain distance along the length direction of the rail to form a first detection track, and then the movable bracket moves the same distance in the opposite direction to form a second detection track; the two end points of the movable bracket's movement distance are respectively located on both sides of the welding joint, and the first detection track and the second detection track coincide.

6. The ultrasonic flaw detection device for rail weld joints according to claim 5, characterized in that: The ultrasonic flaw detection device includes three groups of the first ultrasonic probe groups, which are respectively a rail head first ultrasonic probe group, a top surface first ultrasonic probe group and a bottom surface first ultrasonic probe group.

7. The ultrasonic flaw detection device for rail weld joints according to claim 5, characterized in that: The ultrasonic flaw detection device includes three groups of second ultrasonic probe groups, which are respectively a rail head second ultrasonic probe group, a top surface second ultrasonic probe group and a bottom surface second ultrasonic probe group.

8. The ultrasonic flaw detection device for rail weld joints according to claim 5, wherein the ultrasonic probe is mounted on the bracket via a retractable cylinder, and when the cylinder is extended, the ultrasonic probe is brought close to the rail.

9. The ultrasonic flaw detection device for rail weld joints according to claim 6, characterized in that: The ultrasonic flaw detection device further includes a signal processor, which is electrically connected to the first ultrasonic probe group and the second ultrasonic probe group. The signal processor receives ultrasonic signals from the first ultrasonic probe group and the second ultrasonic probe group and processes them into readable digital signals.

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