CN102854248B - Ultrasonic wave detection system of thin-sheet workpiece annular weld seam - Google Patents
Ultrasonic wave detection system of thin-sheet workpiece annular weld seam Download PDFInfo
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- CN102854248B CN102854248B CN201210341237.7A CN201210341237A CN102854248B CN 102854248 B CN102854248 B CN 102854248B CN 201210341237 A CN201210341237 A CN 201210341237A CN 102854248 B CN102854248 B CN 102854248B
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Abstract
The invention discloses an ultrasonic wave detection system of a thin-sheet workpiece annular weld seam. According to the invention, a rotation pin at the middle of a swing arm of a probe mounting frame is inserted in a longitudinal guide groove of a limiting arm. The rotation pin slides along the guide groove, such that a front end position of the swing arm is adjusted. The structure is fastened by using a wing nut. A lower end of a guide bar arranged at the front end of the wing arm is fixedly connected to a rotation arm with a sleeved probe holder. The probe holder comprises a holding sleeve used for inserting the probe and a slidable sleeve sleeved on the rotation arm. The translation and rotation of the slidable sleeve on the rotation arm are used for adjusting the position and the incidence angle of the probe. An upper end of a rotation shaft of a rotation workbench is positioned in a water tank. A mounting plate with a positioning flange is fixed on the upper end of the rotation arm. A positioning ring is provided on the mounting plate. An ultrasonic flaw detection card comprises 4 ultrasonic working channels, wherein a single-channel sampling frequency is 100MHz. The probe is a high-frequency narrow-pulse flooding point-focusing probe. The system provided by the invention has the advantages of firm workpiece holding, high concentricity, convenient assembling and disassembling, high probe positioning precision, and high probe stability. The system can be used for detecting a narrow weld seam with a width of 2mm on a thin-sheet workpiece with a thickness of 3mm, and can identify a tiny defect with an equivalent size higher than 0.5mm.
Description
Technical field
The present invention relates to ultrasonic detection technology, be specially a kind of ultrasonic wave detecting system of slice work-piece circular weld.
Background technology
UT (Ultrasonic Testing) is the one that belongs to main in Non-Destructive Testing.Can obtain the degree of depth of metal inside defect and the character of defect from position and the waveform of ultrasonic reflections ripple.At present, ultrasonic flaw detection is widely used in the quality testing of forging, foundry goods and weldment.
While using ultrasound examination, to allow the ultrasonic beam of ultrasonic probe scan whole workpiece or whole piece weld seam.Therefore need the rotary table of special clamping workpiece for the workpiece of circular weld, before testing starts, adjust the relative position of probe and measured workpiece, ultrasonic beam is focused in welded joints.Also need to adjust head angle and gain, make the first interface ultrasonic echo amplitude reach requirement.The pulse signal that when detection, UT (Ultrasonic Testing) card sends is added on ultrasonic probe, the ultrasound wave that probe is launched incides on tested workpiece and at the tested position of workpiece internal communication by liquid medium (water), through the reflection of bottom interface or its interior defect, produce echo.Meanwhile, synchronization control circuit control worktable drives measured workpiece at the uniform velocity to rotate, and the tested position of workpiece is steadily at the uniform velocity passed through under ultrasonic probe, and probe receives ultrasonic echo and passes UT (Ultrasonic Testing) card back, analyzing defect type in computing machine.
Current ultrasonic testing system mostly is large-scale, medium-thick type parts such as detecting bar, steel pipe, gear, railway track and train wheel hub, the thickness of the part detecting is generally more than 8mm, accuracy of detection for workpiece is less demanding, as long as detect the defect that is greater than equivalent size 2mm.Owing to more easily distinguishing at Ultrasonic Detection median surface ripple and end ripple at present, defect waves is easily identification also again, and the ordinary ultrasonic probe that frequency is 2.5-5MHz all can complete detection.
For the multiplex high energy beam welding of the slice work-pieces such as clutch driven disk for automobile, as electron beam welding or laser bonding, because workpiece thin (thickness is only 3mm), weld seam narrow (width is 2mm only) and requirement detect the tiny flaw that is greater than equivalent size 0.5mm, plain clamp positioning precision is inadequate, and when ultrasound examination, be prone to upper and lower interface reflection wave aliasing, interface echo and flaw echo are difficult to the phenomenons such as identification.Affect the accurate detection of ultrasound wave to slice work-piece high energy beam weld seam.
Therefore need to develop a kind of ultrasonic wave detecting system of the slice work-piece circular weld that is suitable for high energy beam welding, the registration of its probe and circular weld, ultrasound wave incident angle accurate stable, the installation easy to loading and unloading of slice work-piece to be measured is stable, rotation concentricity is high, to complete the online ultrasound examination of the slice work-piece circular welds such as clutch driven disk for automobile.
Summary of the invention
The object of the invention is to design a kind of ultrasonic wave detecting system of slice work-piece circular weld, comprise computing machine, UT (Ultrasonic Testing) card, ultrasonic probe, also have probe mounting frame, rotary table and water tank.On probe mounting frame, probe clamper can be realized translation and the 360 degree rotations in X-axis and Y direction, convenient probe positions and the angle of regulating; Rotary table is realized clamping to workpiece, is felt relieved and rotatablely move.Thereby can guarantee the ultrasound examination reliable and stable to thin slice circular weld.
The ultrasonic wave detecting system of the slice work-piece circular weld of the present invention's design, comprises computing machine, UT (Ultrasonic Testing) card, ultrasonic probe, also has probe mounting frame, rotary table and water tank; Computing machine connects UT (Ultrasonic Testing) card and synchronization control circuit, UT (Ultrasonic Testing) links and connects probe, send the echoed signal that ultrasonic pulse receiving transducer obtain to popping one's head in, synchronization control circuit connects the motor circuit of controlling rotary table, and probe is installed on the probe clamper on probe mounting frame.Rotary table is installed in water tank.
Probe mounting frame of the present invention comprises swing arm, position limit arm, guide rod, pivoted arm and probe clamper.One end of swing arm and position limit arm is articulated with respectively water tank one side, the front end of swing arm and position limit arm stretches in water tank end face, on position limit arm, there is the gathering sill longitudinal along arm, swing arm middle part is fixed with fulcrum post, and the fulcrum post of swing arm is inserted in the gathering sill of position limit arm, and fulcrum post slides along gathering sill, be the position of adjustable swing arm front end at water tank end face, there is wing nut fulcrum post upper end, and the relative position of the fixing swing arm of fastening wing nut and position limit arm, makes swing arm front end location.Guide rod upper end is inserted in the guide rod hole of swing arm front end, and affixed 1 or 2 pivoted arm of lower end of the guide rod, is set with 1 or 2 probe clamper on every pivoted arm.
Described probe clamper comprises gripper sleeve and sliding sleeve, and the xsect of two sleeves is mutually vertical, has the probe trip bolt of static probe on the barrel of gripper sleeve, and the trip bolt screw-in of popping one's head in after probe insertion gripper sleeve holding out against probe and fixing it.Sliding sleeve coordinates with pivoted arm, sliding sleeve is along the distance at sliding adjustable probe clamper and center, adapt to the circular weld of different-diameter, sliding sleeve rotates around pivoted arm, the angle of adjustable holding sleeve centerline and pedal line, thus the ultrasonic beam that adjusting probe sends is in the incident angle of workpiece for measurement face of weld.On the barrel of sliding sleeve, there is the clamper trip bolt of the relative position of fixing sliding sleeve and pivoted arm, after sliding sleeve position adjustments, clamper trip bolt screws in and hold out against pivoted arm, fixing sliding sleeve in pivoted arm.Also be fixed with cover at gripper sleeve outer wall and be buckled in the fender bracket below probe, fender bracket is net system, collision probe when avoiding work-handling.
Rotary table of the present invention comprises turning axle, mounting disc and motor, and turning axle lower end is rotationally through being connected with motor at the bottom of water tank, seals between at the bottom of turning axle and water tank, and it is just beneath that motor is installed on water tank.Turning axle upper end in water tank, fixed installation dish.In mounting disc, have the convex edge of the projection concentric with turning axle, convex is along being annular protrusion, and internal diameter is greater than the center pit aperture of mounting disc.
For the ease of the workpiece for measurement location of different size, the convex of mounting disc is equal to or less than the internal diameter of workpiece for measurement along external diameter, and is furnished with the locating ring of multiple different sizes, the internal diameter of locating ring equates along external diameter with the convex of mounting disc, each locating ring external diameter equates with certain workpiece for measurement internal diameter, selects to install corresponding locating ring according to workpiece for measurement, and locating ring is loaded in mounting disc, is enclosed within outside convex edge, workpiece for measurement is sleeved on locating ring, and its center keeps coaxial with worktable rotary axle.
Rotate together with mounting disc in order further to stablize workpiece for measurement and to make it, mounting disc is also furnished with 2～6 depression bars, each depression bar comprises orthogonal montant and cross bar, its montant is parallel with turning axle, through be positioned at positioning disk locating ring mounting disc convex along strut kong, on the montant of spring housing below mounting disc, between the nut and mounting disc of montant bottom.The cross bar on depression bar top is above mounting disc, and cross bar front end has downward projection, and the tension force of spring makes that depression bar moves down, the projection of cross bar front end is pressed on workpiece for measurement.Regulate the nut adjustable springs tension force of montant bottom.Depression bar is pressed on workpiece for measurement in mounting disc.
Native system is in order to improve resolution, sensitivity and the signal to noise ratio (S/N ratio) of ultrasound examination, and UT (Ultrasonic Testing) card used is the UT (Ultrasonic Testing) card with 4 ultrasonic service aisles, single channel sample frequency 100MHz.In order to be applicable to identification tiny flaw, to improve resolution and signal to noise ratio (S/N ratio) and adapt to automatically detect, probe used is high-frequency narrow-pulse water logging point focusing probe, its frequency is 10MHz～15MHz, wafer diameter 5～10mm, focal length 20～35mm, and there is echo shape unimodality, pulse width is the frequency characteristic that 70ns～150ns and relative bandwidth are greater than 50%.
Compared with prior art, the advantage of the ultrasonic wave detecting system of slice work-piece circular weld of the present invention is: 1, in the mounting disc of its rotary table, have positioning disk and depression bar, slice work-piece clamping to be measured is firm, high with turning axle concentricity, good stability, vibrate little, and clamping, convenient disassembly, be applicable to the online ultrasound examination of the slice work-piece circular weld of the high energy beam welding such as electron beam or laser beam; 2, the swing arm of probe mounting frame and position limit arm realization are turned round and are located, and swing arm regulates orientation angle precision can reach 0.1 degree, and the fixing locked swing arm of wing nut and position limit arm are stable with what guarantee to pop one's head in and locate in detection; 3, the mounting disc of rotary table and workpiece, in water tank, adopt immersion method to carry out Ultrasonic Detection, and probe does not directly contact with workpiece in couplant water, hyperacoustic transmitting is more stable with reception, pop one's head in not easy to wear, the life-span is long, easily is automated online detection; 4, adopt high-frequency wideband burst pulse water immersion focusing probe, can detect thickness is only the only bead weld of 2mm of width on the slice work-piece of 3mm, and resolution and signal to noise ratio (S/N ratio) are high, can identify the tiny flaw of equivalent size 0.5mm; 5, the motor operation of computer controlled ultrasonic flaw detection card and rotary table, gathers synchronous requirement to meet, and response is fast, precision is high; The positional information of the weld defect that 6, the ultrasound examination defect visual software of computing machine can detect different gates is respectively presented on computer screen in real time, re-use defects in ultrasonic testing intellectual analysis software and determine the character of defect according to flaw echo data, and testing result can show in real time or export on other output facility at display screen, complete online detection; 7, entire system compact conformation, volume are little, and motor, speed reduction unit and other gearings are all placed in water tank bottom, and overall appearance is strong.
Accompanying drawing explanation
Fig. 1 be the ultrasonic wave detecting system embodiment of this slice work-piece circular weld installation the water tank vertical view of rotary table and probe mounting frame;
Fig. 2 be the ultrasonic wave detecting system embodiment of this slice work-piece circular weld installation the water tank side view of rotary table and probe mounting frame;
Fig. 3 is the vertical view of probe mounting frame in Fig. 1;
Fig. 4 is the side view of probe mounting frame in Fig. 1;
Fig. 5 is the enlarged diagram of the probe clamper of probe mounting frame in Fig. 1;
Fig. 6 is rotary table side view in Fig. 1;
Fig. 7 is rotary table vertical view in Fig. 1;
Fig. 8 is the control circuit block diagram of the ultrasonic wave detecting system embodiment of this slice work-piece circular weld.
Figure internal label is: 1, water tank, 11, at the bottom of water tank, 2, probe mounting frame, 21, swing arm; 22, wing nut, 23, position limit arm, 24, pivoted arm, 25, fender bracket; 26, probe clamper, 261, clamper trip bolt, 262, sliding sleeve, 263, probe trip bolt; 264, gripper sleeve, 27, guide rod, 3, rotary table, 31, mounting disc; 311, convex edge, 32, turning axle, 33, depression bar, 34, locating ring; 35, workpiece, 4, frame, 5, water valve.
Embodiment
The ultrasonic wave detecting system embodiment of this slice work-piece circular weld, comprises computing machine, UT (Ultrasonic Testing) card, ultrasonic probe, also has probe mounting frame, rotary table and water tank; Computing machine connects UT (Ultrasonic Testing) card and synchronization control circuit as shown in Figure 8, UT (Ultrasonic Testing) links and connects probe, send the echoed signal that ultrasonic pulse receiving transducer obtain to popping one's head in, synchronization control circuit connects the motor circuit of controlling rotary table, and probe is installed on the probe clamper on probe mounting frame.Rotary table is installed in water tank.
Water tank 1 structural drawing that this example has been installed rotary table 3 and probe mounting frame 2 as illustrated in fig. 1 and 2.Water tank 1 is installed in frame 4.
These routine probe mounting frame 2 structures, as shown in Fig. 1 to 5, comprise swing arm 21, position limit arm 23, guide rod 27, pivoted arm 24 and probe clamper 26.One end of swing arm 21 and position limit arm 23 is articulated with respectively water tank 1 one sides, the front end of swing arm 21 and position limit arm 23 stretches in water tank 1 end face, on position limit arm 23, there is the gathering sill longitudinal along arm, swing arm 21 middle parts are fixed with fulcrum post, the fulcrum post of swing arm 21 is inserted in the gathering sill of position limit arm 23, and fulcrum post slides along gathering sill, regulates the position of swing arm front end at water tank end face, there is wing nut 22 fulcrum post upper end, the relative position of the fixing swing arm 21 of fastening wing nut 22 and position limit arm 23.Guide rod 27 upper ends are inserted in the guide rod hole of swing arm 21 front ends, affixed 2 pivoted arms 24 in guide rod 27 lower ends, and probe clamper 26 is set in pivoted arm 24.At the bottom of water tank, 11 have osculum, and valve 5 is installed on it, are convenient to discharge water.
This routine probe clamper 26 as shown in Figure 5, comprises that the xsect of gripper sleeve 264 and 262, two sleeves of sliding sleeve is mutually vertical, has probe trip bolt 263, in order to be fixedly inserted in the probe in gripper sleeve 264 on the barrel of gripper sleeve 264.Sliding sleeve 262 coordinates with pivoted arm 24, sliding sleeve 262 slides along pivoted arm 24, the different circular welds that adapt to different-diameter of distance at probe clamper 26Yu center, every pivoted arm of this example is installed 1 probe clamper 26, as the probe clamper 26 that the probe clamper 26 in left side in Fig. 4 represents for small diameter circular weld, the probe clamper 26 that the probe clamper 26 in left side represents for larger diameter circular weld.Sliding sleeve 262 rotates around pivoted arm 24, i.e. the angle of adjustable clamp holding sleeve 264 center lines and pedal line, thus the ultrasonic beam that adjusting probe sends is in the incident angle of workpiece for measurement face of weld.Clamper trip bolt 261 on the barrel of sliding sleeve 262 is the relative position with pivoted arm 24 for fixing sliding sleeve 262.Also be fixed with cover at gripper sleeve 264 outer walls and be buckled in the fender bracket 25 below probe, fender bracket 25 use stainless steel wires are made, collision probe when avoiding work-handling.
This routine rotary table 3 as shown in Figure 6, comprise turning axle 32, mounting disc 31, depression bar 33 and motor, turning axle 32 lower ends are rotationally through 11 being connected with motor at the bottom of water tank, sealing between 11 at the bottom of turning axle 32 and water tank, motor, speed reduction unit and other gearings are installed at the bottom of water tank on 11 times methods, racks 4.Turning axle 32 upper ends in water tank 1, fixed installation dish 31.In mounting disc 31, have the convex of the projection concentric with turning axle along 331, convex is along 331 being annular protrusion, and internal diameter is greater than the center pit aperture of mounting disc 31.The convex of mounting disc 31 is less than the internal diameter of workpiece for measurement 35 along 331 external diameters, for the workpiece that is applicable to installation different size is felt relieved rapidly, is furnished with the locating ring 34 of multiple different sizes, the internal diameter of locating ring 34 equates along 331 external diameters with the convex of mounting disc 31, each locating ring 34 external diameters equate with certain workpiece for measurement 35 internal diameters, select to install corresponding locating ring 34 according to workpiece for measurement 35, locating ring 34 is loaded in mounting disc 31, is enclosed within convex outside 331, workpiece for measurement 35 is sleeved on outside locating ring 34, and is pressed in mounting disc 31 by depression bar 33.
This example has three equally distributed depression bars 33 in mounting disc 31, each depression bar 33 comprises orthogonal montant and cross bar, its montant is parallel with turning axle 32, through the convex that is positioned at mounting disc 31 along the strut kong in 331 mounting disc 31, on the montant of spring housing below mounting disc 31, between the nut and mounting disc 31 of montant bottom.The cross bar on depression bar 33 tops is above mounting disc 31, and cross bar front end has downward projection, and the tension force of spring is pressed on workpiece for measurement the projection of cross bar front end.
This routine UT (Ultrasonic Testing) card used is the UT (Ultrasonic Testing) card with 4 ultrasonic service aisles, single channel sample frequency 100MHz.
This routine probe used is high-frequency wideband burst pulse water immersion focusing probe, table 1 has been listed the major parameter index of this routine A used or B probe and frequency characteristic test result, and (EN12668-2:2001 " sign of Non-Destructive Testing-supersonic inspection device and checking-probe " promulgating using European standard association is as testing standard, and test in conjunction with other international standard), in table 1, also the parameter of ordinary ultrasonic probe C is listed as a comparison.
Table 1 ultrasonic probe major parameter and test result complete list
| Sensor 's number | A | B | C |
| Wafer diameter (mm) | 6 | 6 | 14 |
| Focal length (mm) | 30 | 30 | 20 |
| Probe form | Water immersion focusing | Water immersion focusing | Water immersion focusing |
| Focus version | Point focusing | Point focusing | Point focusing |
| Bandwidth | Wideband-short pulse | Wideband-short pulse | Broad pulse |
| Pulse width (ns) | 76 | 148 | 692 |
| Low side frequency (MHz) | 5.54 | 8.51 | 4.32 |
| High-end frequency (MHz) | 18.58 | 15.12 | 5.53 |
| Centre frequency (MHz) | 12.01 | 11.82 | 4.92 |
| Nominal frequency (MHz) | 15 | 10 | 5 |
| Relative bandwidth | 109.35% | 55.94% | 24.49% |
| Sensitivity (dB) | -55.04 | -34.58 | -51.94 |
The echo shape of the probe of this example presents unimodality as shown in Table 1; The pulse width of probe A, B only has 76ns and the 148ns pulse width 692ns much smaller than ordinary ultrasonic probe C; And relative bandwidth has 109.35% and 55.94%, be far wider than 24.49% of ordinary ultrasonic probe C relative bandwidth; The probe that possesses this characteristic is more conducive to distinguish interface echo and flaw echo, has effectively improved resolution, sensitivity and the noise of this ultrasonic testing system, can show outstanding flaw detection resolution and the reproduction of data in detection.
In reality detects, due to clutch plate thin thickness, the easy aliasing of interface echo and flaw echo, makes defect be difficult to identification.In order to improve range resolution, the duration of ultrasonic pulse should be more short better, and the pulse width of oscillography screen display should be less than the path difference of two defects at oscillography screen, and obviously the range resolution of high-frequency narrow-pulse probe is higher.
The ultrasonic pulse frequency of probe transmitting is not single, but has certain bandwidth.From Fourier analysis, the harmonic wave that pulse is equivalent to unlimited multiple different frequency, infinite duration is formed by stacking within the duration of pulse, and cancels each other out outward in the duration, and the duration of pulse is shorter, and the harmonic frequency comprising is wider.The different frequency harmonic wave that burst pulse comprises has the acoustic pressure regularity of distribution on oneself near field, far field and axis, when near field region, the acoustic pressure of different frequency harmonic wave superposes, peak-to-valley value is cancelled out each other, and makes the Sheng Ya – distance Curve of near field region smooth-out, is very beneficial for the detection of near field region.In actual detection, the detection of burst pulse probe is all carried out near field region, can effectively reduce blind area, improve resolving power.And each harmonic wave in flaw echo changes and will cause the variation of frequency spectrum, thereby provide the information of more judgement defect size, orientation and character.So being more suitable for thin slice annular high energy beam weld defect (the electron beam weld defects detection of clutch plate) from the known high-frequency narrow-pulse probe of frequency characteristic of probe detects.
Special high-frequency narrow-pulse probe is applied in the actual detection of slice work-piece annular high energy beam weld defect (clutch driven plate), testing result shows that high-frequency narrow-pulse probe can effectively detect equivalent size and be about 0.4mm and tiny flaw more than 0.5mm, meets testing requirement.And ordinary ultrasonic probe occurs that upper and lower interface reflection wave aliasing, interface echo and flaw echo are difficult to the phenomenons such as identification in the time detecting, only can detect equivalent size is open defect more than 1.5mm.Obvious high-frequency narrow-pulse probe performance of the present invention is good, detects tiny flaw ability strong, is more suitable in the ultrasonic automatic detection of slice work-piece annular high energy beam weld seam.
Above-described embodiment, is only the specific case that object of the present invention, technical scheme and beneficial effect are further described, and the present invention is not defined in this.All any modifications of making, be equal to replacement, improvement etc., within being all included in protection scope of the present invention within scope of disclosure of the present invention.
Claims (9)
1. the ultrasonic wave detecting system of slice work-piece circular weld, comprises computing machine, UT (Ultrasonic Testing) card, ultrasonic probe, also has probe mounting frame, rotary table and water tank; Computing machine connects UT (Ultrasonic Testing) card and synchronization control circuit, UT (Ultrasonic Testing) links and connects probe, send the echoed signal that ultrasonic pulse receiving transducer obtain to popping one's head in, synchronization control circuit connects the motor circuit of controlling rotary table, and probe is installed on the probe clamper on probe mounting frame; Rotary table is installed in water tank; It is characterized in that:
Described probe mounting frame (2) comprises swing arm (21), position limit arm (23), guide rod (27), pivoted arm (24) and probe clamper (26), one end of swing arm (21) and position limit arm (23) is articulated with respectively water tank (1) one side, the front end of swing arm (21) and position limit arm (23) stretches in water tank (1) end face, position limit arm has the gathering sill longitudinal along arm on (23), swing arm (21) middle part is fixed with fulcrum post, the fulcrum post of swing arm (21) is inserted in the gathering sill of position limit arm (23), fulcrum post slides along gathering sill, regulate the position of swing arm (21) front end at water tank end face, there is wing nut (22) fulcrum post upper end, the relative position of the fixing swing arm (21) of fastening wing nut (22) and position limit arm (23), guide rod (27) upper end is inserted in the guide rod hole of swing arm (21) front end, affixed 1 or 2 pivoted arm in guide rod (27) lower end (24), every pivoted arm (24) 1 or 2 probe clamper of upper suit (26).
2. the ultrasonic wave detecting system of slice work-piece circular weld according to claim 1, is characterized in that:
Described probe clamper (26) comprises gripper sleeve (264) and sliding sleeve (262), the xsect of two sleeves is mutually vertical, has the probe trip bolt (263) in order to be fixedly inserted in the probe in gripper sleeve (264) on the barrel of gripper sleeve (264); Sliding sleeve (262) coordinates with pivoted arm (24), sliding sleeve (262) slides or rotates around pivoted arm (24) along pivoted arm (24), is useful on the clamper trip bolt (261) of the relative position of fixing sliding sleeve (262) and pivoted arm (24) on the barrel of sliding sleeve (262).
3. the ultrasonic wave detecting system of slice work-piece circular weld according to claim 2, is characterized in that:
Described gripper sleeve (264) outer wall is also fixed with cover and is buckled in the fender bracket (25) below popping one's head in.
4. according to the ultrasonic wave detecting system of the slice work-piece circular weld described in any one in claims 1 to 3, it is characterized in that:
Described rotary table (3) comprises turning axle (32), mounting disc (31) and motor, turning axle (32) lower end is connected with motor through (11) at the bottom of water tank rotationally, sealing between (11) at the bottom of turning axle (32) and water tank, turning axle (32) upper end in water tank (1), fixed installation dish (31), in mounting disc (31), there is the convex of the projection concentric with turning axle along (331), convex is annular protrusion along (331), and internal diameter is greater than the center pit aperture of mounting disc (31); (11) below at the bottom of motor is installed on water tank.
5. the ultrasonic wave detecting system of slice work-piece circular weld according to claim 4, is characterized in that:
The convex of mounting disc (31) is equal to or less than the internal diameter of workpiece for measurement (35) along (331) external diameter, also are furnished with multiple locating rings (34), the internal diameter of locating ring (34) equates along (331) external diameter with the convex of mounting disc (31), each locating ring (34) external diameter equates with certain workpiece for measurement (35) internal diameter, the locating ring (34) corresponding with workpiece for measurement (35) is loaded in mounting disc (31), is enclosed within convex along outside (331), and workpiece for measurement (35) is sleeved on outside locating ring (34).
6. the ultrasonic wave detecting system of slice work-piece circular weld according to claim 5, is characterized in that:
Described mounting disc (31) is also furnished with 2～6 depression bars (33), each depression bar (33) comprises orthogonal montant and cross bar, its montant is parallel with turning axle (32), through the convex that is positioned at positioning disk (31) along the strut kong in the mounting disc (31) of (331), spring housing on the montant below mounting disc (31), be positioned between the nut and mounting disc (31) of montant bottom; The cross bar on depression bar (33) top is in mounting disc (31) top, and cross bar front end has downward projection, and the tension force of spring is pressed on workpiece for measurement (35) projection of cross bar front end.
7. according to the ultrasonic wave detecting system of the slice work-piece circular weld described in any one in claims 1 to 3, it is characterized in that:
Described water tank (1) is installed in frame (4), and at the bottom of motor, speed reduction unit and drive disk assembly are installed on water tank, (11) are descended on methods, rack (4).
8. according to the ultrasonic wave detecting system of the slice work-piece circular weld described in any one in claims 1 to 3, it is characterized in that:
Described UT (Ultrasonic Testing) card is the UT (Ultrasonic Testing) card with 4 ultrasonic service aisles, single channel sample frequency 100MHz.
9. the ultrasonic wave detecting system of slice work-piece circular weld according to claim 8, is characterized in that:
Described probe is high-frequency narrow-pulse water logging point focusing probe, its frequency 10MHz～15MHz, wafer diameter 5mm～10mm, focal length 20mm～35mm, and there is echo shape unimodality, pulse width is the frequency characteristic that 70ns～150ns and relative bandwidth are greater than 50%.
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