CN114113318A - Ultrasonic detection device for weld quality in low-temperature environment - Google Patents
Ultrasonic detection device for weld quality in low-temperature environment Download PDFInfo
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- CN114113318A CN114113318A CN202111299012.5A CN202111299012A CN114113318A CN 114113318 A CN114113318 A CN 114113318A CN 202111299012 A CN202111299012 A CN 202111299012A CN 114113318 A CN114113318 A CN 114113318A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/267—Welds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides an ultrasonic detection device for weld quality in a low-temperature environment, which belongs to the technical field of nondestructive detection and comprises a shell, a screw, a sealing gasket, a heat insulation plate, a heating plate, a temperature sensor, a temperature regulator, an ultrasonic probe and an ultrasonic detector; the shell comprises an L-shaped cavity and a detection water tank, a welding seam sample is fixed below one side of the inside of the shell in a sealing mode through a screw and a sealing gasket, liquid gas is added into the L-shaped cavity, a shell groove is formed in the shell and used for placing a heat insulation plate, a couplant layer and an ice layer sequentially cover the welding seam sample, and a heating sheet is fixed in the couplant layer; the temperature sensor is arranged in the couplant layer and is in bidirectional connection with the temperature regulator, the temperature regulator is in unidirectional connection with the heating sheet, the ultrasonic probe is arranged in the couplant layer and is in bidirectional connection with the ultrasonic detector, and weld quality detection is achieved. The invention solves the problem that the ultrasonic wave cannot be scanned and acoustically coupled at the low temperature state in the prior art.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to an ultrasonic testing device for weld joint quality in a low-temperature environment.
Background
The important development direction of aircraft design and manufacture is to adopt advanced light materials and an integral structure so as to achieve the purposes of reducing the weight of the whole aircraft, reducing the consumption of fuel and improving the carrying capacity. The novel aluminum alloy material is one of ideal structural materials of the aircraft due to high specific strength and specific stiffness, good fatigue resistance and good low-temperature performance.
In the aerospace field, various forms of aluminum alloy weld seams exist in components such as low-temperature propellant tanks of large vehicles. The complete aluminum alloy plate can form the structural member of the storage tank only through steps of spinning, fine spinning, assembling, welding and the like. Welding is the most critical step in the production of tanks. However, various defects such as micro pores, thermal cracks, evaporation of alloy elements and the like are easily caused in the production process due to the influence of a welding process. Under normal temperature conditions, these defects can be detected and evaluated by ultrasonic waves. However, after the storage tank is filled, the rule that the welding seam and the base metal of the aluminum alloy are influenced by low temperature is not clear, whether the mechanical property of the storage tank is reduced or not needs to be further researched, and corresponding detection and analysis means are lacked.
In order to ensure the integrity and the service safety of the aircraft component and the normal-temperature working condition, the internal defect detection of the welding seam structure and the measurement of the mechanical property of the material can be realized by adopting a conventional ultrasonic detection method. The ultrasonic probe can perform detection by radiating an acoustic wave to the member to be detected with a general couplant. However, under the low-temperature working condition, the surface temperature of the structural member is about 200 ℃ below zero, the couplant is solidified, the ultrasonic probe cannot be attached to the surface of the structural member, and the detection cannot be realized. In addition, the maximum temperature range of the ultrasonic probe used in industry is-20 ℃ to 80 ℃. At very low temperatures, the ultrasonic probe cannot excite sound waves, and the acoustic measurement of the weld joint member is directly influenced. In addition, in the currently developed technology, a cryogenic tank is generally used to simulate the temperature environment of the component, however, in the actual case, the interior of the component stores cryogenic liquid. In order to more accurately reflect the structural state of the welding line in the real working condition, the development of the welding line ultrasonic detection device suitable for the low-temperature liquid environment has practical significance.
For the storage tank type aerospace components, the quality safety of the stress weak part is a key factor for guaranteeing the launching success of the spacecraft. The influence of low-temperature working conditions on component mechanics and material internal damage is an important problem of spacecraft structural design attention. In the prior art, ultrasonic waves cannot be scanned at a low temperature, the problem of acoustic coupling exists, the internal damage and mechanical property of a welding line cannot be tested at a low temperature, and improvement is needed.
Disclosure of Invention
The invention provides an ultrasonic detection device for weld joint quality in a low-temperature environment, which aims to solve the problem that ultrasonic waves cannot be scanned and coupled with sound waves in a low-temperature state in the prior art and realize the test of internal damage and mechanical property of a weld joint under a low-temperature condition.
The purpose of the invention is realized by the following technical scheme:
a welding seam quality ultrasonic detection device for a low-temperature environment comprises a shell, a screw, a sealing gasket, a heat insulation plate, a heating plate, a temperature sensor, a temperature regulator, an ultrasonic probe and an ultrasonic detector; the shell comprises an L-shaped cavity and a detection water tank, a welding seam sample is fixed below one side of the interior of the shell in a sealing mode through a screw and a sealing gasket, one side of a molten pool of a welding seam faces downwards, and the shell is divided into the L-shaped cavity and the detection water tank; the overall section of the L-shaped cavity is L-shaped, liquid gas is added into the L-shaped cavity, a continuous shell groove is formed in the shell in the area of the detection water tank along the periphery of the installation plane where the welding seam sample is located, and the heat insulation plate is arranged along the shell groove and clings to the inner wall of the detection water tank; the ice layer covers one surface of the welding seam sample facing the detection water tank, and the couplant layer covers the ice layer; the heating sheet is fixed on the inner side of the heat insulation plate, and the whole heating part is immersed in the coupling agent layer; the temperature sensor is arranged in the couplant layer, the temperature sensor is in bidirectional connection with the temperature regulator, the temperature regulator is in unidirectional connection with the heating sheet, and the temperature regulator regulates the temperature of the couplant layer by controlling the heating sheet according to the real-time temperature monitored by the temperature sensor so as to enable the temperature to be always within the normal use temperature range of the ultrasonic probe; the ultrasonic probe sensitive element is arranged in the couplant layer, the ultrasonic probe is connected with the ultrasonic detector in a bidirectional mode, the ultrasonic probe radiates ultrasonic waves in the couplant layer, and weld quality detection is achieved through sound waves penetrating through the ice layer.
Furthermore, the ultrasonic detection device for the quality of the welding seam further comprises a heat-insulating layer, and the heat-insulating layer is coated on the side wall and the bottom of the shell.
Further, the liquid gas is filled in the space between the welding seam sample and the bottom of the shell, and the liquid level is higher than the installation position of the welding seam sample.
Furthermore, the top of the L-shaped cavity is provided with a filling port and a pressure relief hole, and the rest parts are sealed by heat insulation materials.
Furthermore, the sealing gasket adopts a polytetrafluoroethylene film.
Further, the screws are 304 stainless steel screws or 1Cr18Ni9Ti stainless steel screws.
Furthermore, the ice layer is formed by the low-temperature solidification of distilled water, and the height is 5 mm-20 mm.
Furthermore, the melting point of the coupling agent used in the coupling agent layer is lower than minus 40 ℃, and the height is 5mm to 50 mm.
The beneficial technical effects obtained by the invention are as follows:
compared with the prior art, the ultrasonic testing device can simulate the service environment of the welding seam in the storage tank of the spacecraft more truly, can realize the mechanical property test and the internal damage detection of the welding seam by ultrasonic waves, solves the problems that the ultrasonic waves cannot be scanned and the sound waves are coupled in a low-temperature state in the prior art, and has outstanding substantive characteristics and remarkable progress.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of an aluminum alloy weld specimen of a spacecraft tank;
FIG. 3 is a partial schematic diagram of one embodiment of the present invention;
reference numerals: 1. a heat-insulating layer; 2. a housing; 3. an L-shaped cavity; 4. a liquid gas; 5. a screw; 6. sealing gaskets; 7. a housing recess; 8. welding seam samples; 9. an ice layer; 10. a heating plate; 11. a heat insulation plate; 12. detecting a water tank; 13. a coupling agent layer; 14. a temperature sensor; 15. an ultrasonic probe; 16. a temperature regulator; 17. an ultrasonic detector.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the detailed description. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, shall fall within the scope of the claimed invention.
As shown in fig. 1 to 3, a specific embodiment of an ultrasonic detection device for detecting the quality of a weld joint in a low-temperature environment includes a housing 2, a screw 5, a sealing gasket 6, a heat insulation plate 11, a heating plate 10, a temperature sensor 14, a temperature regulator 16, a heat insulation layer 1, an ultrasonic probe 15 and an ultrasonic detector 17.
Lateral wall and bottom cladding heat preservation 1 of casing 2, casing 2 include L shape cavity 3 and detection basin 12, and L shape cavity 3 is used for depositing liquid gas 4, and detection basin 12 is used for providing the detection environment who satisfies normal use temperature range for ultrasonic probe 15. The welding seam sample 8 is fixed on the lower part of one side in the shell 2 in a sealing way through a screw 5 and a sealing gasket 6, one surface of a welding seam molten pool faces downwards, and the shell 2 is divided into an L-shaped cavity 3 and a detection water tank 12. The whole cross section of the L-shaped cavity 3 is L-shaped, liquid gas 4 is added into the L-shaped cavity, the space between the welding seam sample 8 and the bottom of the shell 2 is filled with the liquid gas 4, and the liquid level is higher than the installation position of the welding seam sample 8.
The top of the L-shaped cavity 3 is sealed by heat-insulating materials and is provided with a filling port and a pressure relief hole, the filling port is used for filling liquid gas 4, and the pressure relief hole is used for relieving pressure, so that danger caused by overlarge pressure in the L-shaped cavity 3 is prevented.
The sealing gasket 6 is made of a polytetrafluoroethylene film and aims to ensure the sealing of low-temperature liquid under the low-temperature condition.
The screw 5 is made of stainless steel screws, aiming at ensuring the strength of the screw under low temperature conditions, and 304 stainless steel screws or 1Cr18Ni9Ti stainless steel screws can be selected.
The shell 2 is provided with a continuous shell groove 7 along the periphery of an installation plane where a welding seam sample 8 is located in the area of a detection water tank 12, a heat insulation plate 11 is arranged along the shell groove 7 and clings to the inner wall of the detection water tank 12, and the top of the heat insulation plate is consistent with the height of the detection water tank 12, so that heat exchange between the L-shaped cavity 3 and the detection water tank 12 is reduced.
The ice layer 9 is covered on one surface of the welding seam sample 8 facing the detection water tank 12, and the couplant layer 13 is covered on the ice layer 9. The ice layer 9 serves to isolate the weld specimen 8 from the couplant layer 13, creating a temperature gradient. The detection environment of the welding seam sample 8 can simulate the service environment of the welding seam in the storage tank of the spacecraft more truly, and the temperature of the couplant layer 13 is within the normal use temperature range of the ultrasonic probe 15. The problem of motion and sound wave coupling of the ultrasonic probe 15 is solved, the ultrasonic wave is used for testing the mechanical property of the weld joint and detecting internal damage, and the aim of detecting the weld joint is fulfilled.
The ice layer 9 is formed by the low-temperature solidification of distilled water, and the height is 5 mm-20 mm; the melting point of the coupling agent used for the coupling agent layer 13 is lower than minus 40 ℃, and the height is 5mm to 50 mm.
The heating plate 10 is fixed inside the heat insulation plate 11, and the whole heating part is immersed in the couplant layer 13 and used for heating the couplant layer 13, so that the heating part is always within the normal use temperature range of the ultrasonic probe 15.
The temperature sensor 14 is arranged in the couplant layer 13, the temperature sensor 14 is in bidirectional connection with the temperature regulator 16, the temperature regulator 16 is in unidirectional connection with the heating sheet 10, and the temperature regulator 16 regulates the temperature of the couplant layer 13 by controlling the heating sheet 10 according to the real-time temperature monitored by the temperature sensor 14, so that the temperature of the couplant layer 13 is always within the normal use temperature range of the ultrasonic probe 15.
The sensitive element of the ultrasonic probe 15 is arranged in the couplant layer 13, the ultrasonic probe 15 is bidirectionally connected with the ultrasonic detector 17, the ultrasonic probe 15 radiates ultrasonic waves in the couplant layer 13, and the weld quality detection is realized through the sound waves penetrating through the ice layer 9.
In the embodiment, the low-temperature environment of the welding seam is manufactured by the liquid gas 4, the problems of movement and acoustic wave coupling of the ultrasonic probe 15 are solved by the temperature gradients of the ice layer 9 and the couplant layer 13, and the purpose of detecting the welding seam is achieved. The ultrasonic testing device not only can simulate the service environment of the welding seam in the storage tank of the spacecraft more truly, but also can realize ultrasonic testing on the mechanical property of the welding seam and internal damage detection. The ultrasonic detection device solves the problem of ultrasonic detection of the welding line in a low-temperature environment, and is beneficial to the mechanical property test and damage evaluation of the welding line under a low-temperature working condition.
Detailed description of the preferred embodiment
For an aluminum lithium alloy metal box in a spacecraft, the influence of liquid oxygen on the weld quality of the aluminum lithium alloy metal box is always the most concerned problem of the structural design of a storage box, and the flight safety of the spacecraft is directly influenced. Cracks are the most dangerous type of defect for aluminum lithium welds.
The method for ultrasonically detecting the weld quality in the low-temperature environment by adopting the ultrasonic detection device for the weld quality comprises the following steps:
the welding seam parent metal of the welding seam sample 8 which is the detection object is aluminum lithium alloy, and the thickness is 6 mm. Since the melting points of the liquid nitrogen and the liquid oxygen are close to each other, in order to ensure the safety of the detection, the liquid nitrogen is used as the liquid gas 4 instead of the liquid oxygen in the embodiment.
S1, sealing gasket 6 is made of polytetrafluoroethylene film, screw 5 is made of 304 stainless steel screw, and the welding seam sample is fixed on the boss of the shell 2 in a sealing mode through the 304 stainless steel screw and the polytetrafluoroethylene film. After the fixing is finished, the welding seam sample 8 divides the shell 2 into two independent spaces of the L-shaped cavity 3 and the detection water tank 12.
S2, inserting a 3mm foam heat insulation plate as a heat insulation plate 11 at the position of the groove 7 of the shell, wherein the heat insulation plate 11 is fixed on the inner wall of the detection water tank, and the heat exchange of the shell 2 to the detection water tank 12 is slowed down.
S3, uniformly installing 14 silicon rubber heating plates 10 on the heat insulation plate 11 at a height of 15mm from the upper surface of the welding seam sample 8, as shown in figure 3.
S4, slowly injecting normal-temperature distilled water into the detection water tank 12 through the glass rod, so that the weld joint sample 8 is immersed in the normal-temperature distilled water, and the height of the water layer is 10 mm.
S5, injecting liquid nitrogen from the filling port of the L-shaped cavity 3 to enable the liquid level height of the liquid nitrogen to exceed the base material height of the welding seam test piece 8 by about 10 mm.
Waiting for the distilled water to solidify sufficiently to form an ice layer 9.
When the liquid level of the liquid nitrogen is evaporated to be 3-5 mm close to the upper surface of the welding seam sample, the liquid nitrogen is supplemented from the filling port of the L-shaped cavity 3.
And S6, measuring the surface temperature of the ice layer 9 in real time, and when the surface temperature of the ice layer 9 changes within +/-1 ℃ within 10 minutes, slowly adding glass water above the ice layer 9 through a glass rod to enable the glass water to be completely immersed in the silicon rubber heating sheet 10 to form a couplant layer 13, wherein the thickness of the glass water layer is 30 mm.
S7, inserting a temperature sensor 14 into the glass water, and measuring the liquid temperature to be-35 ℃.
The temperature is fed back to the temperature regulator 16 in real time, the silicon rubber heating sheet 10 is controlled to work, the temperature of the glass water is increased to (-10 +/-2) DEG C, and the heating is stopped; when the temperature of the glass water is lower than minus 20 ℃ again, the operation of the silicon rubber heating sheet 10 is restarted, and the temperature of the glass water is controlled to be minus 10 +/-2 ℃.
And S8, adjusting the ultrasonic probe 15 to be perpendicular to the ice layer 9 by adopting an ultrasonic water immersion detection method, exciting the ultrasonic probe 15 by using an ultrasonic detector 17, starting to perform grid scanning on the welding seam, and detecting the crack.
Detailed description of the invention
The liquid hydrogen storage tank in the spacecraft is in a low-temperature environment, and the structural strength of the tank body is directly influenced by the change of the mechanical properties of a welding line and a parent metal thereof. In a low-temperature working condition, the elastic constant and the Poisson ratio are the most concerned indexes of the mechanical property of the welding seam.
The method for ultrasonically detecting the weld quality in the low-temperature environment by adopting the ultrasonic detection device for the weld quality comprises the following steps:
the welding seam base metal of the welding seam sample 8 which is the detection object is aluminum alloy, and the thickness is 10 mm.
Since the melting points of the liquid hydrogen and the liquid helium are close to each other, in order to ensure the safety of detection, the device is described by using the liquid helium instead of the liquid hydrogen as a liquid gas.
S1 and the sealing gasket 6 are made of polytetrafluoroethylene films, the screw 5 is made of a 1Cr18Ni9Ti stainless steel screw, and the welding seam sample 8 is fixed on the boss of the shell 2 through the 1Cr18Ni9Ti stainless steel screw and the polytetrafluoroethylene films. At this time, the weld specimen divides the housing 2 into two spaces, namely an L-shaped cavity 3 and a detection water tank 12.
S2, inserting a 3mm foam heat insulation plate as a heat insulation plate 11 at the position of the groove 7 of the shell, wherein the heat insulation plate 11 is fixed on the inner wall of the detection water tank 12, and the heat exchange of the shell 2 to the detection water tank 12 is slowed down.
S3, uniformly installing 14 silicon rubber heating plates 10 on the heat insulation plate 11 at a height of 20mm from the upper surface of the welding seam sample 8.
S4, injecting normal temperature distilled water into the detection water tank 12 slowly through the glass rod, so that the distilled water is not over the welding seam sample 8, and the height of the water layer is 15 mm.
S5, injecting liquid helium from the filling port of the L-shaped cavity 3 to enable the liquid level height of the liquid helium to exceed the base material height of the welding seam test piece 8 by about 10 mm.
Waiting for the distilled water to solidify sufficiently to form an ice layer 9.
And when the liquid helium level is evaporated to be 3-5 mm close to the upper surface of the welding seam sample, supplementing liquid helium from the filling port of the L-shaped cavity 3.
S6, measuring the surface temperature of the ice layer 9 in real time, and when the surface temperature of the ice layer 9 does not exceed +/-1 ℃ within 10 minutes, uniformly adding high-viscosity wire-drawing damping grease above the ice layer 9 to enable the high-viscosity wire-drawing damping grease to be completely immersed in the silicone rubber heating sheet 10 to form a couplant layer 13, wherein the thickness of the high-viscosity wire-drawing damping grease is 30 mm.
S7, inserting a temperature sensor 14 into the high-viscosity wire drawing damping grease, and measuring the liquid temperature to be-40 ℃.
The temperature is fed back to the temperature regulator 16 in real time, the silicon rubber heating sheet 10 is controlled to work, the temperature of the high-viscosity wire drawing damping grease is raised to (-15 +/-2) DEG C, and the heating is stopped; when the temperature of the high-viscosity wiredrawing damping grease is lower than minus 20 ℃ again, the operation of the silicon rubber heating sheet 10 is restarted, and the temperature of the high-viscosity wiredrawing damping grease is controlled to be minus 15 +/-2 ℃.
S8, the dual-mode ultrasonic probe 15 is adjusted to be perpendicular to the ice layer 9, and a grid scan of the weld is started.
At each scanning position, excitation is applied to a longitudinal wave wafer in the dual-mode ultrasonic probe 15 by using the ultrasonic detector 17, longitudinal waves are radiated, and the velocity of the longitudinal waves of the welding seam is measured.
The ultrasonic detector 17 is used to apply excitation to the transverse wave wafer in the dual-mode ultrasonic probe 15, radiate transverse waves, and measure the transverse wave velocity of the weld joint.
And calculating the elastic modulus and Poisson's ratio of the welding seam and the parent metal by utilizing the general knowledge of ultrasonic detection.
The specific embodiment can realize the following beneficial effects:
1. the double-cavity structure formed by the tested piece and the shell provides a liquid gas storage device for the welding line test piece, so that the test condition of the low-temperature state of a detected object can be met, and the test environment of the real liquid immersion working condition can be simulated;
2. the harsh requirements of the detection process on the low-temperature characteristics of the ultrasonic probe are avoided by the temperature transition mode of three media of the detected object, the ice layer and the couplant layer, and the scanning problem of the ultrasonic probe under the low-temperature working condition is solved;
3. the ice layer and the couplant layer are utilized to realize the acoustic coupling of ultrasonic waves, provide an acoustic propagation path from the ultrasonic probe to a weld sample, and provide a medium for measuring the internal damage and the mechanical property of the weld under the low-temperature working condition.
In conclusion, compared with the prior art, the technical scheme provided by the specific embodiment can simulate the service environment of the welding seam in the storage tank of the spacecraft more truly, can realize the mechanical property test and internal damage detection of the welding seam by ultrasonic waves, solves the problems that the ultrasonic waves cannot be scanned and the sound waves are coupled in a low-temperature state in the prior art, and has outstanding substantive characteristics and remarkable progress.
Claims (8)
1. The ultrasonic detection device for the quality of the welding seam in the low-temperature environment is characterized by comprising a shell (2), a screw (5), a sealing gasket (6), a heat insulation plate (11), a heating plate (10), a temperature sensor (14), a temperature regulator (16), an ultrasonic probe (15) and an ultrasonic detector (17);
the shell (2) comprises an L-shaped cavity (3) and a detection water tank (12), a welding seam sample (8) is fixed below one side of the interior of the shell (2) in a sealing mode through a screw (5) and a sealing gasket (6), one side of a molten pool of a welding seam faces downwards, and the shell (2) is divided into the L-shaped cavity (3) and the detection water tank (12);
the whole section of the L-shaped cavity (3) is L-shaped, liquid gas (4) is added inside the L-shaped cavity,
the shell (2) is arranged in the area of the detection water tank (12), a continuous shell groove (7) is formed around the installation plane where the welding seam sample (8) is located, and the heat insulation plate (11) is arranged along the shell groove (7) and clings to the inner wall of the detection water tank (12);
the ice layer (9) covers one surface of the welding seam sample (8) facing the detection water tank (12), and the couplant layer (13) covers the ice layer (9);
the heating sheet (10) is fixed on the inner side of the heat insulation board (11), and the whole heating part is immersed in the coupling agent layer (13); the temperature sensor (14) is arranged in the couplant layer (13), the temperature sensor (14) is in bidirectional connection with the temperature regulator (16), the temperature regulator (16) is in unidirectional connection with the heating sheet (10), and the temperature regulator (16) regulates the temperature of the couplant layer (13) by controlling the heating sheet (10) according to the real-time temperature monitored by the temperature sensor (14) so as to enable the temperature to be always within the normal use temperature range of the ultrasonic probe (15);
the sensitive element of the ultrasonic probe (15) is arranged in the couplant layer (13), the ultrasonic probe (15) is bidirectionally connected with the ultrasonic detector (17), the ultrasonic probe (15) radiates ultrasonic waves in the couplant layer (13), and the weld quality detection is realized through sound waves penetrating through the ice layer (9).
2. The ultrasonic weld quality detection device according to claim 1, wherein: the ultrasonic detection device for the weld quality further comprises a heat insulation layer (1), and the heat insulation layer (1) is coated on the side wall and the bottom of the shell (2).
3. The ultrasonic weld quality detection device according to claim 2, wherein: the liquid gas (4) is filled in the space between the welding seam sample (8) and the bottom of the shell (2), and the liquid level is higher than the installation position of the welding seam sample (8).
4. The ultrasonic weld quality detection device according to claim 3, wherein: the top of the L-shaped cavity (3) is provided with a filling port and a pressure relief hole, and the rest parts are sealed by heat insulation materials.
5. The ultrasonic weld quality detection device according to any one of claims 1 to 4, wherein: the sealing gasket (6) is made of a polytetrafluoroethylene film.
6. The ultrasonic weld quality detection device according to any one of claims 1 to 4, wherein: the screw (5) adopts a 304 stainless steel screw or a 1Cr18Ni9Ti stainless steel screw.
7. The ultrasonic weld quality detection device according to any one of claims 1 to 4, wherein: the ice layer (9) is formed by low-temperature solidification of distilled water, and the height is 5-20 mm.
8. The ultrasonic weld quality detection device according to claim 7, wherein: the melting point of the coupling agent used in the coupling agent layer (13) is lower than-40 ℃, and the height is 5 mm-50 mm.
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| CN115647684A (en) * | 2022-12-26 | 2023-01-31 | 北京坤飞航天科技有限公司 | Rapid nondestructive detection method and device for surfacing defects |
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| CN110596252A (en) * | 2019-10-12 | 2019-12-20 | 淮阴师范学院 | Steel construction welding seam ultrasonic detection equipment |
| CN110608029A (en) * | 2019-10-21 | 2019-12-24 | 西安科技大学 | Medium coupling device and method for testing liquid nitrogen fracturing coal seam fracture through drilling |
| CN113092264A (en) * | 2021-03-15 | 2021-07-09 | 山东科技大学 | Acoustic wave test experimental device and method under coal rock damage condition |
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| CN115647684A (en) * | 2022-12-26 | 2023-01-31 | 北京坤飞航天科技有限公司 | Rapid nondestructive detection method and device for surfacing defects |
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