Ultrasonic system for reducing energy loss during change of propagation path of ultrasonic surface wave

Abstract

An ultrasonic system for reducing energy loss during change of an ultrasonic surface wave propagation path comprises a to-be-tested component, an ultrasonic conduction piece and an ultrasonic surface wave transmitting and receiving device. Wherein the to-be-tested component is a high-temperature to-be-tested target and is connected with the ultrasonic surface wave transmitting and receiving device through the ultrasonic conduction piece; one end of the ultrasonic conduction piece is tangentially and fixedly connected with the surface of the to-be-detected component, and the other end of the ultrasonic conduction piece is connected to an ultrasonic probe of the ultrasonic surface wave transmitting and receiving device; the arc-shaped transition device is utilized, and the transition device is in tangent connection with the to-be-tested component and the heat dissipation component, so that signal attenuation when ultrasonic waves pass through can be greatly reduced; heat is prevented from being conducted to the ultrasonic probe through the heat dissipation component, and transmitting and receiving devices of the ultrasonic surface waves are protected.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic flaw detection and monitoring, and in particular relates to an ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves changes. Background Art

[0002] The main steam and hot section pipelines in power station boilers work in harsh environments such as high temperature and high pressure for a long time during the operation of the generator set. The main steam pipelines are inevitably damaged by high temperature creep, causing the degradation of material properties, which leads to material performance failure and safety accidents. It is very necessary and urgent to conduct health monitoring and inspection on these in-service main steam pipelines to obtain the remaining life of the main steam pipelines.

[0003] At present, the commonly used detection methods mainly include on-site metallographic and hardness testing methods. This method can only test the surface status of the main steam pipeline, and the inspection range is small. In addition, when using metallographic and hardness testing, only a rough estimate of its creep aging can be obtained, and the error range is large. If samples are directly taken for creep rupture testing, welding repairs are required at the sampling site after sampling. This repair method will have an adverse effect on the overall performance of the main steam pipeline. The small punch creep test developed in recent years is a micro-sample sampling and testing technology, but the test takes some time, which is not conducive to rapid detection and analysis.

[0004] The creep damage of the main steam pipeline when operating at high temperature and high pressure is a phenomenon related to temperature, stress and time, and is a cumulative damage change process of the material's microstructure. During the creep damage process, the solid solution alloy elements in the material will continue to precipitate, the composition, morphology, distribution and concentration of the carbides will change, and the carbides will continue to accumulate at the grain boundaries and even form holes. This change in the structure of the main steam pipeline material will cause the scattering of stress waves, thereby affecting the attenuation coefficient of ultrasonic waves in the material.

[0005] Since the components to be inspected are in a high temperature state during operation, and the current ultrasonic surface wave transmitting and receiving devices cannot work in a high temperature state for a long time, it is necessary to provide a new ultrasonic system that can reduce ultrasonic energy loss. Summary of the invention

[0006] The purpose of the present invention is to adapt to high-temperature detection objects and provide an ultrasonic system that reduces energy loss when the propagation path of ultrasonic surface waves changes.

[0007] An ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves changes, comprising a component to be tested, an ultrasonic conductive component, and an ultrasonic surface wave transmitting and receiving device; characterized in that:

[0008] The component to be tested is a high-temperature target to be tested, and the component to be tested is connected to an ultrasonic surface wave transmitting and receiving device through an ultrasonic conductive member;

[0009] The ultrasonic conductive element is in the shape of a thin and long strip, one end of which is tangent and fixedly connected to the surface of the component to be tested, and the other end is connected to the ultrasonic probe of the ultrasonic surface wave transmitting and receiving device.

[0010] The beneficial effects of the present invention are:

[0011] Compared with the prior art, the present invention designs an ultrasonic system that reduces energy loss when the propagation path of ultrasonic surface waves is changed. By designing an ultrasonic conduction structure, surface waves are generated at room temperature and propagated to the surface of the component to be inspected by changing the path, which can greatly reduce the signal attenuation of ultrasonic waves when they pass through; and through the heat dissipation components, heat is prevented from being conducted to the ultrasonic probe, thereby realizing the detection and monitoring of in-service components under high temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the system structure diagram.

[0013] Figure 2 Connecting structure for transition device Figure 1 .

[0014] Figure 3 Connecting structure for transition device Figure 2 .

[0015] In the figure: 1 component to be tested, 2 transition device, 3 heat dissipation device, 4 welding area, 5 adhesive area slope. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 As shown, the ultrasonic system includes a component to be tested, a transition device and a heat dissipation device.

[0018] The components to be tested are high-temperature targets, especially high-temperature pipelines, such as the main steam and hot section pipelines in power station boilers.

[0019] The component to be tested is connected to an ultrasonic probe (not shown) via an ultrasonic conductor.

[0020] The ultrasonic transmission components include a transition device and a heat dissipation device.

[0021] The transition device is an arc-shaped strip structure with a certain radius of curvature, one end of which is tangently fixedly connected to the surface of the component to be tested by welding or bonding, and the other end is connected to the heat dissipation device.

[0022] The dimensions of the transition device are width ≥ 10 mm and thickness ≥ 10 mm, which ensures its structural strength and facilitates the conduction of ultrasonic surface waves.

[0023] Its curvature radius r≥5λ (λ is the wavelength of the surface wave), which facilitates the conduction of ultrasonic surface waves.

[0024] The deflection center angle θ can be selected within the range of 0 to 180°, thereby facilitating reasonable setting of the spatial position relationship between the ultrasonic probe and the component to be measured.

[0025] The heat dissipation device is a long strip structure, one end of which is connected to the transition device, and the other end is connected to the ultrasonic probe.

[0026] The thickness of the heat sink is ≥10mm to ensure its structural strength and facilitate the conduction of ultrasonic surface waves. The heat sink is used to dissipate the heat conducted by the high-temperature test component to the surroundings to prevent the heat from being conducted to the ultrasonic probe, thereby adversely affecting the ultrasonic surface wave transmitting and receiving devices.

[0027] The heat sink has a certain length to ensure its heat dissipation function. In addition, the surface of the heat sink can be processed to form ribs, fins, and thread structures to expand its heat dissipation area and improve the heat dissipation effect.

[0028] The transition device and the heat dissipation device are made of the same material as the component to be tested, or are made of a material with a smaller attenuation coefficient of ultrasonic surface waves than the component to be tested.

[0029] like Figure 2 The component to be tested is connected tangentially to the transition device.

[0030] When welding is used, the outer arc surface of the transition device contacts and is tangent to the surface of the component to be tested. A welding zone is formed at the end face of the transition device. The connection between the transition device and the component to be tested is achieved by accumulating metal solder in the welding zone. The ultrasonic surface wave enters the component to be tested through the transition device and the metal solder in the welding zone.

[0031] In the conventional right-angle weld connection of the tube sheet, the ultrasonic surface wave is basically completely attenuated when passing through the corner weld, and it is impossible to further detect the high-temperature components to be tested.

[0032] By utilizing an arc-shaped transition device, the transition device is tangentially connected to the component to be tested and the heat dissipation component, which can greatly reduce the signal attenuation when the ultrasonic wave passes through.

[0033] When the bonding method is adopted, the outer arc surface of one end of the transition device is processed with a bonding area inclined surface 5, and the bonding area inclined surface 5 is in contact with and tangent to the surface of the component to be tested. The bonding area inclined surface 5 and the surface of the component to be tested are bonded by a high temperature resistant adhesive. The ultrasonic surface wave passes through the transition device and the bonding area adhesive and enters the component to be tested. The high temperature resistant adhesive is preferably used as an adhesive for metal materials.

[0034] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultrasonic system for reducing energy loss when the propagation path of an ultrasonic surface wave is changed, comprising: Component to be tested, ultrasonic transmission component, ultrasonic surface wave transmitting and receiving device; characterized in that, The component to be tested is a high-temperature target to be tested, and the component to be tested is connected to an ultrasonic surface wave transmitting and receiving device through an ultrasonic conductive member; The ultrasonic conductive element is in the shape of a thin and long strip, one end of which is tangent and fixedly connected to the surface of the component to be tested, and the other end is connected to the ultrasonic probe of the ultrasonic surface wave transmitting and receiving device.

2. An ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves changes according to claim 1, characterized in that: The ultrasonic transmission element includes a transition device and a heat dissipation device; The transition device is an arc-shaped strip structure with a certain radius of curvature, one end of which is tangently fixedly connected to the surface of the component to be tested, and the other end is connected to the heat dissipation device.

3. An ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 2, characterized in that: Its curvature radius r≥5λ, λ is the wavelength of the surface wave, which facilitates the conduction of the ultrasonic surface wave.

4. The ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 2, characterized in that: The dimensions of the transition device are width ≥ 10 mm, thickness ≥ 10 mm, and the deflection center angle θ is selected within the range of 0 to 180 degrees.

5. The ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 2, characterized in that: The fixed connection method with the surface of the component to be tested is welding or bonding.

6. The ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 2, characterized in that: The heat dissipation device is a long strip structure, one end of which is connected to the transition device, and the other end is connected to the ultrasonic probe.

7. An ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 6, characterized in that: The heat sink has a certain length to ensure its heat dissipation function. In addition, the surface of the heat sink is processed to form ribs, fins and thread structures.

8. An ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 2, characterized in that: The transition device and the heat dissipation device are made of the same material as the component to be tested, or are made of a material with a smaller attenuation coefficient of ultrasonic surface waves than the component to be tested.

9. The ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 5, characterized in that: When welding is used, the outer arc surface of the transition device contacts and is tangent to the surface of the component to be tested; a welding zone is formed at the end face of the transition device, and the connection between the transition device and the component to be tested is achieved by accumulating metal solder in the welding zone, and the ultrasonic surface wave enters the component to be tested through the transition device and the metal solder in the welding zone; When the bonding method is adopted, the outer arc surface of one end of the transition device is processed with a bevel, and the bevel is in contact with and tangent to the surface of the component to be tested; the bevel and the surface of the component to be tested are bonded by a high-temperature resistant adhesive; the ultrasonic surface wave passes through the transition device and the adhesive in the bonding area and then enters the component to be tested.

10. The ultrasonic system for reducing energy loss when the propagation path of ultrasonic surface waves is changed according to claim 1, characterized in that: High temperature pipelines of the components to be tested.

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