CN115420810A - Ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser weld joint detection - Google Patents

Ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser weld joint detection Download PDF

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Publication number
CN115420810A
CN115420810A CN202211206250.1A CN202211206250A CN115420810A CN 115420810 A CN115420810 A CN 115420810A CN 202211206250 A CN202211206250 A CN 202211206250A CN 115420810 A CN115420810 A CN 115420810A
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workpiece
ultrasonic
guided wave
coupling
flexible coupling
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段珍珍
贾坤宁
赵世喆
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Changchun Institute of Applied Chemistry of CAS
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Changchun Institute of Applied Chemistry of CAS
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating 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
    • G01N29/22Details, e.g. general constructional or apparatus details
    • G01N29/26Arrangements for orientation or scanning by relative movement of the head and the sensor
    • G01N29/275Arrangements for orientation or scanning by relative movement of the head and the sensor by moving both the sensor and the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70Auxiliary operations or equipment
    • B23K26/702Auxiliary equipment
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating 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
    • G01N29/04Analysing solids

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  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention relates to an ultrasonic guided wave probe follow-up coupling and posture adjusting device for laser weld joint detection, and belongs to the field of welding process control. The device is fixedly arranged on a movement mechanism of the laser welding equipment through a flange of a connecting seat, and the whole device moves synchronously with a laser welding head; the connecting seat transmits the pressing force to the surface of the workpiece through the pressing spring, the retainer, the roll-over stand, the rolling mandrel and the flexible coupling wheel, so that the flexible coupling wheel is well attached to the surface of the workpiece and continuously rolls forwards along with the welding process; the flexible coupling wheel is always attached to the surface of the workpiece, and an ultrasonic coupling passage is provided for the ultrasonic piezoelectric crystal inside the flexible coupling wheel and the workpiece to be detected. According to the invention, through the design of mechanical structures such as flexible rolling coupling and self-adaptive attitude adjustment, the synchronous movement of the ultrasonic probe and welding equipment in the laser welding process, continuous coupling with a workpiece to be detected and angle adjustment are realized, and the efficiency of the ultrasonic nondestructive testing technology is greatly improved.

Description

Ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser weld joint detection
Technical Field
The invention relates to the field of welding process control, in particular to the technical field of lap laser welding seam on-line ultrasonic detection and evaluation, and particularly relates to an ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser welding seam detection.
Background
In recent years, with the increasing requirements for the quality and production efficiency of thin plate welding parts in the manufacturing fields of automobiles, railway carriages and the like, the laser welding process is widely applied due to the advantages of high efficiency, small deformation and the like. However, the laser welding process has high requirements on conditions such as assembly gap and clamping precision of workpieces, otherwise quality problems such as incomplete penetration and poor forming are easily caused. Therefore, the problem of online monitoring of the laser welding process, especially monitoring of the penetration state, is always a hot spot concerned by welding workers, and is also a key problem to be solved urgently in the manufacturing field of automobiles, railway carriages and the like.
At present, the ultrasonic nondestructive detection of the lap laser welding seam is generally carried out by adopting a post-welding detection mode. Although the method can realize nondestructive detection and evaluation of welding quality, the method still has defects in detection efficiency. In order to further reduce the time consumption of inspection and improve the welding production efficiency, real-time ultrasonic detection in the welding process becomes an important way for solving the requirement.
Disclosure of Invention
The invention aims to provide an ultrasonic guided wave probe follow-up coupling and posture adjusting device for laser weld joint detection, and aims to solve the problem of reliable coupling of a probe and a workpiece in the ultrasonic real-time detection technology in the welding process. Aiming at the actual characteristics of the sheet lap-joint laser welding process in the prior stage, the invention realizes the synchronous motion of the ultrasonic probe along with the laser head in the welding process, simultaneously ensures the good coupling of the probe and the surface of a workpiece, and can realize the automatic adjustment function of the ultrasonic incident angle so as to meet the excitation and the receiving of ultrasonic guided waves of different modes, thereby realizing the real-time detection of the weld penetration state in the laser welding process.
The above purpose of the invention is realized by the following technical scheme:
the device aims to realize the functions of compressing, synchronous motion and follow-up coupling of an ultrasonic probe and a detected workpiece and automatic adjustment of an ultrasonic incident angle in the laser welding process. The device has linear movement vertical to the surface of a workpiece, rolling parallel to the surface of the workpiece and along the welding direction, and 3 adjustment degrees of freedom of overturning parallel to the surface of the workpiece and taking the welding direction as an axis, and simultaneously meets the requirements of vertical compaction, rolling coupling and probe angle tilting of the ultrasonic probe and the surface of the workpiece; the device comprises a connecting seat 1, a linear bearing 2, a compression spring 3, a retainer 4, a stepping motor 5, a driving gear 6, a roll-over stand 7, a rolling mandrel 8, a fastening screw 9, a flexible coupling wheel 10 and an ultrasonic piezoelectric crystal 11, wherein the device is fixedly arranged on a movement mechanism of laser welding equipment by the fastening screw 9 through a flange of the connecting seat 1, and the whole device synchronously moves along with a laser welding head; the connecting seat 1 transmits pressing force to the surface of a workpiece through the pressing spring 3, the retainer 4, the roll-over stand 7, the rolling mandrel 8 and the flexible coupling wheel 10, so that the flexible coupling wheel 10 is well attached to the surface of the workpiece and can continuously roll forwards along with the welding process; the flexible coupling wheel 10 is always attached to the surface of the workpiece, and an ultrasonic coupling passage is provided for the ultrasonic piezoelectric crystal 11 inside the flexible coupling wheel and the workpiece to be detected.
The connecting seat 1 and the retainer 4 realize vertical relative movement through the linear bearing 2, the pressing spring 3 is sleeved on the retainer 4 and positioned between the connecting seat 1 and the retainer 4, and pressing force pointing to the surface of a workpiece is provided through the retainer 4; the lower end of the retainer 4 is provided with a rotary positioning hole, and the axis of the roll-over stand 7 is coaxially arranged with the axis of the rotary positioning hole; the stepping motor 5 is arranged on the retainer 4, and the shaft end of the stepping motor is provided with the driving gear 6; the driving gear 6 is meshed with external teeth above the roll-over stand 7 and can drive the roll-over stand 7 to rotate left and right along the axis of the roll-over stand; the rolling mandrel 8 is fixed below the roll-over stand 7, and the axis of the rolling mandrel and the axis of the roll-over stand 7 are arranged in a 90-degree cross manner; the ultrasonic piezoelectric crystal 11 is embedded in the middle of the rolling mandrel 8, and the ultrasonic emission direction is vertical to the axis of the rolling mandrel 8 and points downwards to the surface of a workpiece; a flexible coupling wheel 10 is arranged in the middle of the rolling mandrel 8, and an ultrasonic piezoelectric crystal 11 is wrapped inside the flexible coupling wheel 10; in the synchronous motion process, the flexible coupling wheel 10 rotates along the axis of the rolling mandrel 8, and the tread of the flexible coupling wheel is always attached to the surface of the workpiece, so that the acoustic coupling between the ultrasonic piezoelectric crystal 11 and the workpiece to be detected is realized.
The device can be used independently or in pairs, and is used independently for self-receiving ultrasonic guided wave detection; the ultrasonic guided wave detection of the transmitting-receiving type is carried out in pairs. Different using modes, the working principle and the adjusting method are the same, and the space structure requirements of different detection objects can be met.
The invention also aims to provide an ultrasonic guided wave probe follow-up coupling and posture adjusting method for laser weld detection, wherein in the laser welding process, the device keeps synchronous motion with a laser head through a connecting seat 1, a flexible coupling wheel 10 is well attached to the surface of a workpiece and continuously rolls forwards along with the welding process; the stepping motor 5 adjusts the overturning angle of the overturning frame 7 relative to the retainer 4 through the driving gear 6, and drives the rolling mandrel 8 and the ultrasonic piezoelectric crystal 11 to generate inclination of a fixed angle relative to the surface of the workpiece; after the upper control host sets the required ultrasonic guided wave mode, sending an adjusting instruction to the device; the stepping motor 5 drives the roll-over stand 7 to gradually rotate from the negative limit angle position to the positive limit angle position according to a fixed step angle, ultrasonic guided waves are received and transmitted once at each step angle position, when received guided wave signals are the same as a set mode, angle adjustment is automatically stopped, and the angle is locked to perform subsequent weld joint detection.
The invention has the beneficial effects that: aiming at the actual requirements of on-line ultrasonic detection of the lap laser welding seam, the invention realizes the synchronous movement of the ultrasonic probe and the welding equipment and the continuous coupling and angle adjustment with the detected workpiece in the laser welding process by the design of mechanical structures such as flexible rolling coupling, self-adaptive posture adjustment and the like, and greatly improves the efficiency of the ultrasonic nondestructive detection technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a schematic three-dimensional structure diagram of an ultrasonic guided-wave probe follow-up coupling and attitude adjustment device according to the present invention;
FIG. 2 is a schematic sectional structure view of the ultrasonic guided wave probe follow-up coupling and posture adjustment device of the present invention;
FIG. 3 is a schematic diagram of the operation of the ultrasonic guided wave probe follow-up coupling and attitude adjustment device of the present invention;
FIG. 4 and FIG. 5 are schematic diagrams of the laser welding penetration ultrasonic guided wave detection mode of the present invention;
FIG. 6 is a schematic view of the laser welding penetration ultrasonic guided wave detection working mode of the present invention;
FIG. 7 is a schematic diagram of the mode adjustment of the ultrasonic guided wave of the present invention;
FIG. 8 is a 0 degree incident ultrasonic guided wave mode detection signal of the present invention;
FIG. 9 is a 15 degree incident ultrasonic guided wave mode detection signal of the present invention;
figure 10 is a 30 ° incident ultrasonic guided wave mode detection signal of the present invention.
In the figure: 1. a connecting seat; 2. a linear bearing; 3. a compression spring; 4. a holder; 5. a stepping motor; 6. a drive gear; 7. a roll-over stand; 8. rolling the mandrel; 9. fastening screws; 10. a flexible coupling wheel; 11. an ultrasonic piezoelectric crystal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 10, the ultrasonic guided wave probe follow-up coupling and posture adjusting device and method for laser weld seam detection of the present invention are used for on-line ultrasonic guided wave detection of a fusion penetration state of lap laser welding. Aiming at the actual characteristics of the sheet lap-joint laser welding process at the present stage, the ultrasonic probe synchronously moves along with the laser head in the welding process, the good coupling of the probe and the surface of a workpiece is ensured, the automatic adjustment function of the ultrasonic incident angle can be realized, the excitation and the receiving of ultrasonic guided waves in different modes are met, the real-time detection of the weld penetration state in the laser welding process is realized, and the purpose of improving the online nondestructive efficiency of the welding quality is achieved.
Referring to fig. 1 to 3, the ultrasonic guided wave probe follow-up coupling and posture adjustment device for laser weld inspection of the present invention is composed of a connection seat 1, a linear bearing 2, a compression spring 3, a holder 4, a stepping motor 5, a driving gear 6, a roll-over stand 7, a rolling core shaft 8, a fastening screw 9, a flexible coupling wheel 10 and an ultrasonic piezoelectric crystal 11. The whole device has linear movement perpendicular to the surface of the workpiece, rolling parallel to the surface of the workpiece and along the welding direction, and 3 adjustment degrees of freedom of overturning parallel to the surface of the workpiece and taking the welding direction as an axis, and simultaneously meets the requirements of vertical compaction, rolling coupling and probe angle tilting of the ultrasonic probe and the surface of the workpiece.
Referring to fig. 3 to 5, the device is fixed on a moving mechanism of the laser welding equipment by fastening screws through flanges of the connecting seat 1, and the whole device moves synchronously with a laser welding head. The connecting seat 1 transmits pressing force to the surface of a workpiece through the pressing spring 3, the retainer 4, the roll-over stand 7, the rolling mandrel 8 and the flexible coupling wheel 10, so that the flexible coupling wheel 10 is well attached to the surface of the workpiece and can continuously roll forwards along with the welding process; the flexible coupling wheel 10 is always attached to the surface of the workpiece, and an ultrasonic coupling passage is provided for the ultrasonic piezoelectric crystal 11 in the flexible coupling wheel and the workpiece to be detected. The device can be independently used for carrying out spontaneous self-retracting ultrasonic guided wave detection; the ultrasonic guided wave detection device can also be used in pairs to carry out the transmission-reception type ultrasonic guided wave detection. Different using modes, the working principle and the adjusting method are the same, and the space structure requirements of different detection objects can be met.
Referring to fig. 6, the method for the follow-up coupling and the attitude adjustment of the ultrasonic guided wave probe for detecting the laser weld seam according to the present invention comprises: in the laser welding process, the device keeps synchronous motion with a laser head through the connecting seat 1; the pressing spring 3 transmits the pressing force to the surface of the workpiece through the retainer 4, the roll-over stand 7, the rolling mandrel 8 and the flexible coupling wheel 10, ensures that the flexible coupling wheel 10 is well attached to the surface of the workpiece, and continuously rolls forwards along with the welding process; the stepping motor 5 adjusts the relative angle between the roll-over stand 7 and the retainer 4 through the driving gear 6, and drives the rolling mandrel 8 and the ultrasonic piezoelectric crystal 11 to generate a fixed-angle inclination relative to the surface of the workpiece, so that the adjustment of the ultrasonic incident angle is realized. And adjusting the ultrasonic incident angle before the follow-up detection of the welding seam each time by adopting an automatic matching mode. After the upper control host sets the required ultrasonic guided wave mode, sending an adjusting instruction to the device; the stepping motor 5 drives the roll-over stand 7 to gradually rotate from the negative limit angle position to the positive limit angle position according to a fixed step angle, ultrasonic guided waves are received and transmitted once at each step angle position, when received guided wave signals are the same as a set mode, angle adjustment is automatically stopped, and the angle is locked to perform subsequent weld joint detection.
When the laser welding seam is detected on line, the ultrasonic guided wave probe follow-up coupling and posture adjusting device for detecting the laser welding seam is positioned on one side (self-sending and self-receiving) or two sides (one sending and one receiving) of the laser welding seam. As the laser welding process is carried out, the flexible coupling wheel 10 of the device is always attached to the surface of the workpiece, and an ultrasonic coupling passage is provided for the ultrasonic piezoelectric crystal 11 in the device and the workpiece to be detected. At any detection position, ultrasonic waves excited by the ultrasonic piezoelectric crystal 11 enter the workpiece through the flexible coupling wheel 10 and form ultrasonic guided waves in a specific mode; the ultrasonic guided wave is transmitted to a laser welding seam area along the plate to generate reflection and transmission phenomena; when the self-sending and self-receiving working mode is adopted, the reflected wave returns to the excitation probe along the original path, and when the one-sending and one-receiving working mode is adopted, the transmitted wave crosses the welding seam and continuously propagates forwards to the receiving probe, so that the excitation and the receiving of the ultrasonic guided wave signals are realized.
Referring to fig. 7, according to the detection requirement, the stepping motor 5 adjusts the turning angle of the turning frame 7 relative to the holder 4 through the driving gear 6, and drives the rolling mandrel 8 and the ultrasonic piezoelectric crystal 11 to generate a fixed-angle inclination relative to the surface of the workpiece, so as to meet the adjustment requirement of a specific ultrasonic mode under different ultrasonic incident angles.
Example 1:
the following description will be given by taking the detection of the semi-penetration type lap laser weld for the railway car body parts as an example:
(1) The diameter phi of the flexible coupling wheel is 40mm, and the maximum vertical compression amount is 10mm; the maximum tilting angle of the roll-over stand is +/-30 degrees, the stepping angle of the stepping motor is 1.5 degrees, and the gear transmission ratio is 1; the size of the ultrasonic piezoelectric crystal is 6mm multiplied by 6mm, the central frequency is 10MHz, and the focal depth is 12mm; the repetition frequency of ultrasonic receiving and transmitting is 1KHz; the thickness of an upper layer plate of a laser welding workpiece is 2mm, and the laser welding speed is 100mm/s.
(2) And in the laser welding process, the ultrasonic probe continuously excites ultrasonic waves at the repetition frequency of 1KHz, and the receiving and sending detection of the ultrasonic guided waves can be realized at the last time every 0.1mm of the length of a welding line under the welding speed process condition of 100mm/s. According to the detection requirement, the roll-over stand can realize the angle adjustment of-30 degrees to +30 degrees, and according to the step angle of the stepping motor and the gear transmission ratio, the minimum adjustment angle is 0.15 degree, so that the finish milling fine adjustment in an ultrasonic guided wave mode can be met. As shown in fig. 8 to 10, under the conditions of incidence angles of 0 °, 15 ° and 30 °, ultrasonic guided wave signals with different modes can be obtained, so as to meet different detection requirements.
Under the normal use condition, the device can meet the requirements of ultrasonic guided wave on-line detection with adjustable high frequency, continuity and mode in the laser welding process, and greatly improves the welding inspection and production efficiency.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.

Claims (4)

1. The utility model provides a laser welding seam detects with supersound guided wave probe follow-up coupling and gesture adjusting device which characterized in that: the device has three adjustment degrees of freedom including linear movement perpendicular to the surface of a workpiece, rolling parallel to the surface of the workpiece along the welding direction, and overturning parallel to the surface of the workpiece and taking the welding direction as an axis, and meets the requirements of vertical compaction, rolling coupling and probe angle tilting of an ultrasonic probe and the surface of the workpiece; the device comprises a connecting seat (1), a linear bearing (2), a compression spring (3), a retainer (4), a stepping motor (5), a driving gear (6), a roll-over stand (7), a rolling mandrel (8), a fastening screw (9), a flexible coupling wheel (10) and an ultrasonic piezoelectric crystal (11), wherein the device is fixedly arranged on a moving mechanism of laser welding equipment by the fastening screw (9) through a flange of the connecting seat (1), and the whole device synchronously moves along with a laser welding head; the connecting seat (1) transmits pressing force to the surface of a workpiece through a pressing spring (3), a retainer (4), a roll-over stand (7), a rolling mandrel (8) and a flexible coupling wheel (10), so that the flexible coupling wheel (10) is ensured to be well attached to the surface of the workpiece and continuously rolls forwards along with the welding process; the flexible coupling wheel (10) is always attached to the surface of the workpiece, and an ultrasonic coupling passage is provided for the ultrasonic piezoelectric crystal (11) inside the flexible coupling wheel and the workpiece to be detected.
2. The ultrasonic guided-wave probe follow-up coupling and attitude adjusting device for laser weld detection according to claim 1, characterized in that: the vertical relative movement between the connecting seat (1) and the retainer (4) is realized through the linear bearing (2), the compression spring (3) is sleeved on the retainer (4) and positioned between the connecting seat (1) and the retainer (4), and the compression force pointing to the surface of a workpiece is provided through the retainer (4); the lower end of the retainer (4) is provided with a rotary positioning hole, and the roll-over stand (7) is coaxially arranged with the rotary positioning hole; the stepping motor (5) is arranged on the retainer (4), and the shaft end of the stepping motor is provided with the driving gear (6); the driving gear (6) is meshed with external teeth above the roll-over stand (7) to drive the roll-over stand (7) to rotate left and right along the axis; the rolling mandrel (8) is fixed below the roll-over stand (7), and the axis of the rolling mandrel and the axis of the roll-over stand (7) are arranged in a 90-degree cross manner; the ultrasonic piezoelectric crystal (11) is embedded in the middle of the rolling mandrel (8), and the ultrasonic emission direction is vertical to the axis of the rolling mandrel (8) and points downwards to the surface of a workpiece; a flexible coupling wheel (10) is arranged in the middle of the rolling mandrel (8), and an ultrasonic piezoelectric crystal (11) is wrapped inside the flexible coupling wheel (10); in the process of synchronous movement, the flexible coupling wheel (10) rotates along the axis of the rolling mandrel (8), and the tread of the flexible coupling wheel is always attached to the surface of a workpiece, so that the acoustic wave coupling between the ultrasonic piezoelectric crystal (11) and the workpiece to be measured is realized.
3. The ultrasonic guided wave probe follow-up coupling and attitude adjustment device for laser weld inspection according to claim 1 or 2, characterized in that: the device is used independently or in pairs, and is used independently for self-receiving ultrasonic guided wave detection; the ultrasonic guided wave detection of the transmitting-receiving type is carried out in pairs.
4. An ultrasonic guided wave probe follow-up coupling and attitude adjusting method for laser weld detection, which is realized by the ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser weld detection according to claim 3, is characterized in that: in the laser welding process, the device keeps synchronous motion with a laser head through the connecting seat (1), the flexible coupling wheel (10) is well attached to the surface of a workpiece, and continuously rolls forwards along with the welding process; the step motor (5) adjusts the overturning angle of the overturning frame (7) relative to the retainer (4) through the driving gear (6) to drive the rolling mandrel (8) and the ultrasonic piezoelectric crystal (11) to generate inclination of a fixed angle relative to the surface of a workpiece; after the upper control host sets a required ultrasonic guided wave mode, sending an adjusting instruction to the device; step motor (5) drive roll-over stand (7) from negative limit angle position to positive limit angle position according to fixed step angle and progressively rotate, receive and dispatch ultrasonic guided wave once at every step angle position, when received guided wave signal and settlement mode are the same automatic stop angle modulation to lock this angle and carry out subsequent welding seam detection.
CN202211206250.1A 2022-09-30 2022-09-30 Ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser weld joint detection Pending CN115420810A (en)

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CN202211206250.1A CN115420810A (en) 2022-09-30 2022-09-30 Ultrasonic guided wave probe follow-up coupling and attitude adjusting device for laser weld joint detection

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117554488A (en) * 2024-01-11 2024-02-13 成都工业学院 Tank defect intelligent detection trolley with ultrasonic dry coupling function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117554488A (en) * 2024-01-11 2024-02-13 成都工业学院 Tank defect intelligent detection trolley with ultrasonic dry coupling function
CN117554488B (en) * 2024-01-11 2024-03-22 成都工业学院 Tank defect intelligent detection trolley with ultrasonic dry coupling function

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