CN114113318B - Ultrasonic welding seam quality detection device for low-temperature environment - Google Patents
Ultrasonic welding seam quality detection device for low-temperature environment Download PDFInfo
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- CN114113318B CN114113318B CN202111299012.5A CN202111299012A CN114113318B CN 114113318 B CN114113318 B CN 114113318B CN 202111299012 A CN202111299012 A CN 202111299012A CN 114113318 B CN114113318 B CN 114113318B
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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 a welding seam quality ultrasonic detection device for a low-temperature environment, which belongs to the technical field of nondestructive detection and comprises a shell, screws, 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 line sample is fixed below one side of the inside of the shell in a sealing way 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 are sequentially covered on the welding line sample, and a heating plate is fixed in the couplant layer; the temperature sensor is arranged inside the couplant layer and is in bidirectional connection with the temperature regulator, the temperature regulator is in unidirectional connection with the heating plate, the ultrasonic probe is arranged inside the couplant layer and is in bidirectional connection with the ultrasonic detector, and the quality detection of welding seams is realized. The invention solves the problems that ultrasonic waves cannot be scanned and the ultrasonic waves cannot be coupled in a low-temperature state in the prior art.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to a welding seam quality ultrasonic testing device for a low-temperature environment.
Background
The important development direction of aircraft design and manufacture is to adopt advanced light materials and integral structures so as to achieve the purposes of reducing the weight of the whole aircraft and fuel consumption, thereby improving carrying capacity. The novel aluminum alloy material is one of ideal structural materials of the aircraft due to higher specific strength and specific rigidity, good fatigue resistance and low-temperature performance.
In the aerospace field, there are many forms of aluminum alloy welds in components such as low temperature propellant tanks for large vehicles. The complete aluminum alloy plate can be formed into the storage tank structural member through the steps of spinning, fine spinning, assembling, welding and the like. Welding is the most critical step in tank production. However, during the production process, various types of defects, such as micro pores, thermal cracks, evaporation of alloy elements, etc., are liable to occur due to the influence of the welding process. Under normal temperature conditions, these defects can be usually detected and evaluated by ultrasonic waves. However, after the storage tank is filled, the influence rule of the aluminum alloy welding line and the base metal under the low temperature is not clear, whether the mechanical property of the storage tank is reduced or not is required to be further researched, and corresponding detection and analysis means are lacking.
In order to ensure the integrity and the service safety of the aircraft components, the internal defect detection of the weld joint structure and the measurement of the mechanical properties of materials can be realized by adopting a conventional ultrasonic detection method under normal temperature working conditions. The ultrasonic probe can detect by radiating sound waves to the member to be detected through the common couplant. However, under the low-temperature working condition, the surface temperature of the structural member is about minus 200 ℃, the couplant is solidified at the moment, and the ultrasonic probe cannot be attached to the surface of the structural member, so that detection cannot be realized. In addition, the temperature range of the ultrasonic probe used in industry is minus 20 ℃ to 80 ℃ at maximum. At very low temperatures, the ultrasonic probe cannot excite sound waves, directly affecting the acoustic measurements of the weld members. Furthermore, in the currently developed technology, a low-temperature tank is generally used to simulate the temperature environment of the component, however, in practice, the component stores a low-temperature liquid inside. In order to reflect the structural state of the welding seam in the real working condition more accurately, the development of the welding seam ultrasonic detection device suitable for the low-temperature liquid state environment has practical significance.
For the storage tank type aerospace component, the quality safety of the stress weak part is a key factor for ensuring the successful emission 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 concern. In the prior art, ultrasonic waves cannot be scanned at a low temperature, the problem of acoustic wave coupling exists, the internal damage of a welding line and the test of mechanical properties cannot be realized under the low temperature condition, and improvement is needed.
Disclosure of Invention
The invention provides a welding seam quality ultrasonic detection device for a low-temperature environment, and aims to solve the problems that ultrasonic waves cannot be scanned and acoustic wave coupling cannot be achieved in the low-temperature state in the prior art, and to achieve the test of internal damage and mechanical properties of welding seams under the low-temperature condition.
The invention aims at realizing the following technical scheme:
the ultrasonic welding seam quality detection device for the 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 way through a screw and a sealing gasket, one surface of a molten pool of the welding seam faces downwards, and the shell is divided into the L-shaped cavity and the detection water tank; the whole cross section of the L-shaped cavity is L-shaped, liquid gas is added into the L-shaped cavity, the shell is arranged in the area of the detection water tank, a continuous shell groove is formed along the periphery of the installation plane where the welding line sample is positioned, and the heat insulation plate is tightly attached to the inner wall of the detection water tank along the shell groove; 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 plate is fixed on the inner side of the heat insulation plate, and the heating part is wholly immersed in the couplant 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 plate, and the temperature regulator regulates the temperature of the couplant layer through controlling the heating plate according to the real-time temperature monitored by the temperature sensor, so that the temperature of the couplant layer is always in 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 way, the ultrasonic probe radiates ultrasonic waves in the couplant layer, and the quality detection of the welding seam is realized through the sound waves penetrating through the ice layer.
Further, the welding seam quality ultrasonic detection device further comprises an insulating layer, and the insulating layer is coated on the side wall and the bottom of the shell.
Further, the liquid gas fills the space between the weld sample and the bottom of the housing, and the liquid level is higher than the installation position of the weld sample.
Further, the top of the L-shaped cavity is provided with a filling opening and a pressure relief hole, and other parts are sealed by adopting heat preservation and insulation materials.
Further, the sealing gasket adopts a polytetrafluoroethylene film.
Further, the screw is a 304 stainless steel screw or a 1Cr18Ni9Ti stainless steel screw.
Further, the ice layer is formed by low-temperature solidification of distilled water, and the height is 5 mm-20 mm.
Further, the melting point of the couplant used by the couplant layer is lower than-40 ℃ and the height is 5 mm-50 mm.
The beneficial technical effects obtained by the invention are as follows:
compared with the prior art, the method can simulate the service environment of the welding seam in the storage tank of the spaceflight carrier 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 ultrasonic waves cannot be coupled in a low-temperature state in the prior art, and has outstanding substantive characteristics and remarkable progress.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention;
FIG. 2 is a schematic illustration of a spacecraft tank aluminum alloy weld specimen;
FIG. 3 is a schematic view of a partial structure of one embodiment of the present invention;
reference numerals: 1. a heat preservation layer; 2. a housing; 3. an L-shaped cavity; 4. a liquid gas; 5. a screw; 6. a sealing gasket; 7. a housing groove; 8. a weld test sample; 9. an ice layer; 10. a heating sheet; 11. a heat insulating plate; 12. a detection water tank; 13. a couplant layer; 14. a temperature sensor; 15. an ultrasonic probe; 16. a temperature regulator; 17. an ultrasonic detector.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings and the detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention as claimed.
As shown in fig. 1 to 3, an embodiment of a welding seam quality ultrasonic detection device for a low-temperature environment comprises 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 insulating layer 1, an ultrasonic probe 15 and an ultrasonic detector 17.
The lateral wall and the bottom cladding heat preservation 1 of casing 2, and casing 2 include L shape cavity 3 and detect basin 12, and L shape cavity 3 is used for depositing liquid gas 4, detects basin 12 and is used for providing the detection environment who satisfies normal use temperature range for ultrasonic transducer 15. The welding seam sample 8 is fixed under one side of the inside of the shell 2 in a sealing way through the screw 5 and the sealing gasket 6, one surface of a molten pool of the welding seam 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 line 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 line sample 8.
The top of L shape cavity 3 adopts thermal insulation material to seal, is provided with filler and pressure release hole, and the filler is used for filling liquid gas 4, and the pressure release hole is used for the pressure release, prevents that the excessive internal pressure of L shape cavity 3 from causing danger.
The sealing gasket 6 adopts a polytetrafluoroethylene film, so as to ensure the sealing of low-temperature liquid under the low-temperature condition.
The screw 5 adopts a stainless steel screw, so as to ensure the strength of the screw under the low temperature condition, and can be a 304 stainless steel screw or a 1Cr18Ni9Ti stainless steel screw.
In the region of the detection water tank 12, the shell 2 is provided with a continuous shell groove 7 along the periphery of the installation plane of the welding seam sample 8, the heat insulation plate 11 is closely attached to the inner wall of the detection water tank 12 along the shell groove 7, the top is consistent with the height of the detection water tank 12, and the purpose is to reduce heat exchange between the L-shaped cavity 3 and the detection water tank 12.
The ice layer 9 covers the surface of the weld sample 8 facing the detection water tank 12, and the couplant layer 13 covers the ice layer 9. The function of the ice layer 9 is to isolate the weld sample 8 from the couplant layer 13, creating a temperature gradient. The detection environment of the welding seam sample 8 is satisfied, the service environment of the welding seam in the storage tank of the spaceflight carrier is more truly simulated, 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 mechanical property test and the internal damage detection of the ultrasonic welding seam are realized, and the purpose of welding seam detection is achieved.
The ice layer 9 is formed by low-temperature solidification of distilled water, and the height is 5 mm-20 mm; the melting point of the couplant used by the couplant layer 13 is lower than-40 ℃ and the height is 5 mm-50 mm.
The heating plate 10 is fixed on the inner side of the heat insulation plate 11, and the heating part is integrally immersed in the couplant layer 13 and is used for heating the couplant layer 13, so that the couplant layer 13 is always in the normal use temperature range of the ultrasonic probe 15.
The temperature sensor 14 is arranged inside 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 plate 10, and the temperature regulator 16 regulates the temperature of the couplant layer 13 through controlling the heating plate 10 according to the real-time temperature monitored by the temperature sensor 14, so that the temperature is always in the normal use temperature range of the ultrasonic probe 15.
The sensitive element of the ultrasonic probe 15 is arranged inside the couplant layer 13, the ultrasonic probe 15 is connected with the ultrasonic detector 17 in a two-way, the ultrasonic probe 15 radiates ultrasonic waves in the couplant layer 13, and the quality detection of the welding seam 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 through the liquid gas 4, and the problems of movement and acoustic wave coupling of the ultrasonic probe 15 are solved through the temperature gradients of the ice layer 9 and the couplant layer 13, so that the purpose of welding seam detection is achieved. The welding seam service environment in the storage tank of the spaceflight carrier can be simulated more truly, and the ultrasonic welding seam mechanical property test and the internal damage detection can be realized. The ultrasonic detection method solves the problem of ultrasonic detection of the weld joint in a low-temperature environment, and is beneficial to mechanical property test and damage evaluation of the weld joint in a low-temperature working condition.
Detailed description of the preferred embodiments
For an aluminum-lithium alloy oxygen tank in a spacecraft, the influence of liquid oxygen on the quality of a welding seam of the aluminum-lithium alloy oxygen tank is always the most concerned problem of the structural design of the storage tank, 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 weld quality ultrasonic detection device comprises the following steps:
the weld base material of the weld sample 8, which is the detection object, was an aluminum-lithium alloy, and the thickness was 6mm. Because the melting point of liquid nitrogen is close to that of liquid oxygen, in order to ensure the safety of detection, liquid nitrogen is adopted as the liquid gas 4 instead of liquid oxygen in the specific embodiment.
S1, sealing gasket 6 adopts polytetrafluoroethylene film, screw 5 adopts 304 stainless steel screw, and the welding seam sample is sealed and fixed on the boss of casing 2 through 304 stainless steel screw and polytetrafluoroethylene film. After the fixation is completed, 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 at the position of the shell groove 7 to serve as a heat insulation plate 11, wherein the heat insulation plate 11 is fixed on the inner wall of the detection water tank, and heat exchange of the shell 2 to the detection water tank 12 is slowed down.
S3, uniformly mounting 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 FIG. 3.
S4, slowly injecting normal-temperature distilled water into the detection water tank 12 through a glass rod to submerge the welding seam sample 8, wherein the height of a water layer is 10mm.
S5, injecting liquid nitrogen from a filling port of the L-shaped cavity 3, so that the liquid level of the liquid nitrogen exceeds the height of the base metal of the weld test piece 8 by about 10mm.
The distilled water is waited for 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 line sample, the liquid nitrogen is supplemented from the filling port of the L-shaped cavity 3.
S6, measuring the surface temperature of the ice layer 9 in real time, slowly adding glass water above the ice layer 9 through a glass rod when the surface temperature of the ice layer 9 changes for 10 minutes and does not exceed +/-1 ℃, so that the glass water fully submerges the silicon rubber heating sheet 10 to form a couplant layer 13, and the thickness of the glass water layer is 30mm.
S7, inserting a temperature sensor 14 into the glass water, and measuring the temperature of the liquid to be minus 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 glass water temperature is lower than-20 ℃ again, restarting the operation of the silicon rubber heating sheet 10, and controlling the glass water temperature to be (-10+/-2).
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 utilizing the ultrasonic detector 17, starting to scan the welding line in a grid way, and detecting cracks.
Second embodiment
The liquid hydrogen storage tank in the spacecraft is in a low-temperature environment, and the change of the mechanical properties of the welding seam and the base metal directly affects the structural strength of the tank body. In low temperature working conditions, the elastic constant and the poisson ratio are the most concerned indexes of the mechanical properties of the welding seam.
The method for ultrasonically detecting the weld quality in the low-temperature environment by adopting the weld quality ultrasonic detection device comprises the following steps:
the weld base material of the weld sample 8, which is the object to be detected, was an aluminum alloy, and the thickness was 10mm.
Because the melting points of liquid hydrogen and liquid helium are close, in order to ensure the safety of detection, liquid helium is used for device description instead of liquid hydrogen as liquid gas.
S1, a polytetrafluoroethylene film is adopted as a sealing gasket 6, a 1Cr18Ni9Ti stainless steel screw is adopted as a screw 5, and a welding seam sample 8 is fixed on a boss of the shell 2 through the 1Cr18Ni9Ti stainless steel screw and the polytetrafluoroethylene film. At this time, the weld sample divides the housing 2 into two spaces of the L-shaped cavity 3 and the detection water tank 12.
S2, inserting a 3mm foam heat insulation plate at the position of the shell groove 7 to serve as a heat insulation plate 11, wherein the heat insulation plate 11 is fixed on the inner wall of the detection water tank 12, and heat exchange of the shell 2 to the detection water tank 12 is slowed down.
S3, uniformly mounting 14 silicon rubber heating plates 10 on the heat insulation plate 11 at a height of 20mm from the upper surface of the welding line sample 8.
S4, slowly injecting normal-temperature distilled water into the detection water tank 12 through a glass rod to enable the normal-temperature distilled water to pass through the welded seam sample 8, wherein the height of a water layer is 15mm.
S5, injecting liquid helium from a filling port of the L-shaped cavity 3, so that the liquid level of the liquid helium exceeds the height of the base metal of the weld test piece 8 by about 10mm.
The distilled water is waited for to solidify sufficiently to form an ice layer 9.
When the liquid helium level evaporates to be 3-5 mm close to the upper surface of the welding line 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 changes within 10 minutes and does not exceed +/-1 ℃, uniformly adding high-viscosity wiredrawing damping grease above the ice layer 9 to enable the high-viscosity wiredrawing damping grease to completely submerge the silicon rubber heating sheet 10 to form a couplant layer 13, wherein the thickness of the high-viscosity wiredrawing damping grease is 30mm.
S7, inserting a temperature sensor 14 into the high-viscosity wiredrawing damping grease, and measuring the temperature of the liquid 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 wiredrawing damping grease is increased to (-15+/-2) DEG C, and the heating is stopped; when the temperature of the high-viscosity wiredrawing damping grease is lower than-20 ℃ again, restarting the operation of the silicon rubber heating sheet 10, and controlling the temperature of the high-viscosity wiredrawing damping grease to be (-15+/-2).
S8, adjusting the dual-mode ultrasonic probe 15 to be perpendicular to the ice layer 9, and starting grid scanning on the welding line.
At each scanning position, excitation is applied to the longitudinal wave wafer in the dual mode ultrasonic probe 15 by the ultrasonic detector 17, longitudinal waves are radiated, and the weld longitudinal wave velocity 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 velocity of the transverse waves of the weld.
And calculating the elastic modulus and poisson ratio of the welding line and the base material by utilizing the general knowledge of ultrasonic detection.
The above embodiment can realize the following beneficial effects:
1. the liquid gas storage device is provided for the weld test piece through the double-cavity structure formed by the tested piece and the shell, so that the test condition of the low-temperature state of the test object can be met, and the test environment of the real liquid immersion working condition can be simulated;
2. the temperature transition mode of the three mediums of the object to be tested, the ice layer and the couplant layer avoids the harsh requirement of the detection process on the low-temperature characteristic of the ultrasonic probe, and solves the scanning problem of the ultrasonic probe under the low-temperature working condition;
3. the ice layer and the couplant layer are utilized to realize the acoustic coupling of ultrasonic waves, the acoustic propagation path from the ultrasonic probe to the welding line sample is provided, and the medium is provided for the measurement of the damage and mechanical properties inside the welding line 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 spaceflight carrier 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 ultrasonic waves cannot be coupled in a low-temperature state in the prior art, and has outstanding substantive characteristics and remarkable progress.
Claims (8)
1. The ultrasonic welding line quality detection device for 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 line sample (8) is fixed below one side of the interior of the shell (2) in a sealing way through a screw (5) and a sealing gasket (6), one surface of a welding line melting pool faces downwards, and the shell (2) is divided into the L-shaped cavity (3) and the detection water tank (12);
the whole cross section of the L-shaped cavity (3) is L-shaped, liquid gas (4) is added into the cavity,
the shell (2) is provided with a continuous shell groove (7) along the periphery of the installation plane of the welding line sample (8) in the area of the detection water tank (12), and the heat insulation plate (11) is closely attached to the inner wall of the detection water tank (12) along the shell groove (7);
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 heating plate (10) is fixed on the inner side of the heat insulation plate (11), and the heating part is wholly immersed in the couplant 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 plate (10), and the temperature regulator (16) regulates the temperature of the couplant layer (13) through controlling the heating plate (10) according to the real-time temperature monitored by the temperature sensor (14) so as to be always in the normal use temperature range of the ultrasonic probe (15);
the sensitive element of the ultrasonic probe (15) is arranged inside the couplant layer (13), the ultrasonic probe (15) is connected with the ultrasonic detector (17) in a two-way, the ultrasonic probe (15) radiates ultrasonic waves in the couplant layer (13), and the quality detection of the welding seam is realized through the sound waves penetrating through the ice layer (9).
2. The weld quality ultrasonic testing apparatus of claim 1, wherein: the welding seam quality ultrasonic detection device further comprises an insulating layer (1), and the insulating layer (1) is coated on the side wall and the bottom of the shell (2).
3. The weld quality ultrasonic testing apparatus of claim 2, wherein: the liquid gas (4) fills the space between the welding line sample (8) and the bottom of the shell (2), and the liquid level is higher than the installation position of the welding line sample (8).
4. The weld quality ultrasonic testing apparatus of claim 3, wherein: the top of the L-shaped cavity (3) is provided with a filling opening and a pressure relief hole, and other parts are sealed by adopting heat preservation and insulation materials.
5. The weld quality ultrasonic testing apparatus according to any one of claims 1 to 4, wherein: and the sealing gasket (6) is made of polytetrafluoroethylene films.
6. The weld quality ultrasonic testing apparatus according to any one of claims 1 to 4, wherein: the screw (5) is a 304 stainless steel screw or a 1Cr18Ni9Ti stainless steel screw.
7. The weld quality ultrasonic testing apparatus 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 mm-20 mm.
8. The weld quality ultrasonic testing apparatus of claim 7, wherein: the melting point of the couplant used by the couplant layer (13) is lower than-40 ℃ and the height is 5 mm-50 mm.
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| 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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