CN103728375A - Assessment device for fillet weld of end flange of GIS (gas insulated switchgear) and barrel and lossless assessment method - Google Patents
Assessment device for fillet weld of end flange of GIS (gas insulated switchgear) and barrel and lossless assessment method Download PDFInfo
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- CN103728375A CN103728375A CN201410014404.6A CN201410014404A CN103728375A CN 103728375 A CN103728375 A CN 103728375A CN 201410014404 A CN201410014404 A CN 201410014404A CN 103728375 A CN103728375 A CN 103728375A
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Abstract
The invention discloses an assessment device for a fillet weld of an end flange of a GIS (gas insulated switchgear) and a barrel and a lossless assessment method, aiming at solving the problem that an existing detection method cannot effectively achieve lossless assessment on the fillet weld of the end flange of the GIS and the barrel. The device is characterized in that an ultrasonic probe is installed on a wedge block, both the ultrasonic probe and a encoder are connected with a scanning rack so as to run synchronously, the encoder is connected with an ultrasonic wave phased array detector through a data line, the ultrasonic probe is connected with the ultrasonic wave phased array detector through the data line, and the surface of the ultrasonic probe is coated with a coupling agent and is connected with the wedge block through bolts. The assessment device can realize lossless assessment of total cross section of the structure, can detect both surface defect and interior defect, can detect both the outer fillet weld of the end flange of the GIS in service and the barrel and the inner fillet weld, and can comprehensively assess the quality of the structure.
Description
Technical field
The present invention relates to electric power complete equipment field of non destructive testing, specifically a kind of gas insulated switchgear end flange and cylindrical shell fillet weld apparatus for evaluating and nondestructive evaluation method thereof based on ultrasonic phase array.
Background technology
Gas insulated switchgear (being called for short GIS) is the complete equipment that combined by multiple High-Voltage Electrical Appliances such as isolating switch, disconnector, grounding switch, buses, these equipment or parts are all enclosed in metal can inside, and are filled with the certain pressure SF of (being generally greater than 0.3MPa)
6gas is as insulation and arc-extinguishing medium; Wherein GIS tank body is pressure-containing member, requires SF
6year leak rate is less than 1%.
GIS end flange and cylindrical shell fillet weld are the principal welds of GIS tank body, GIS end flange and cylindrical shell fillet weld are the lack of penetration plug-in types of permission as shown in Figure 1, this structure consists of end flange 1, cylindrical shell 2, fillet weld outside 3 and fillet weld inner side 4, flange platform is inserted in cylindrical shell end, by welding, form fillet weld inner side 4 and fillet weld outside 3, cylindrical shell end angle keeps lack of penetration state.Conventional GIS tank body material is aluminium alloy 5A02-H112 or carbon steel Q235, diameter 400-1000mm, thickness of shell 6-10mm, the common 5mm of cylindrical shell insertion depth.In production run, weld seam easily produces the weld defectss such as incomplete fusion, pore and crackle.GIS during one's term of military service, due to reasons such as stress and vibrations, easily makes fillet weld crack.Therefore should be in time regular carries out nondestructive evaluation to this structure, gets rid of in time hidden danger, guarantees the stable operation of system.
For GIS end flange and cylindrical shell fillet weld, domestic main use penetrant detecting method.Infiltration detects can only detect surface imperfection, cannot detect internal porosity, do not merge, not ftracture and arrive surperficial defects i.e.cracks.For the GIS tank body of being on active service, 4 regions, fillet weld inner side cannot be implemented infiltration and be detected in addition.Therefore, existing detection method can not effectively solve the nondestructive evaluation problem of GIS end flange and cylindrical shell fillet weld.
Summary of the invention
Technical matters to be solved by this invention is to overcome the defect that above-mentioned existing detection method exists, a kind of GIS end flange and cylindrical shell fillet weld apparatus for evaluating based on ultrasonic phase array is provided, can realize this structure total cross-section nondestructive evaluation, surface imperfection can not only be detected, inherent vice can also be detected; Military service GIS end flange and cylindrical shell lateral angle weld seam can not only be detected, and medial angle weld seam can also be detected.
For this reason, the technical solution used in the present invention is as follows: GIS end flange and cylindrical shell fillet weld apparatus for evaluating, comprise ultrasonic phased array detector, ultrasonic probe, voussoir, scrambler, scanning frame, CSK-IIA test block, CSK-IA test block and reference block, it is characterized in that, described ultrasonic probe is arranged on voussoir, ultrasonic probe is all connected with scanning frame with scrambler, make ultrasonic probe and scrambler synchronous operation, described scrambler is connected with ultrasonic phased array detector by data line, described ultrasonic probe is connected with ultrasonic phased array detector by data line, described ultrasonic probe surface scribbles couplant, by bolt, is connected with voussoir.
The ultimate principle of apparatus for evaluating of the present invention is: ultrasonic probe is apart from flange specific range, along GIS tank surface hoop, move, scrambler records ultrasonic probe position, ultrasonic probe carries out sector display according to certain focusing rule diagonal angle weld seam, ultrasonic phased array detector becomes ultrasonoscopy sector display data-switching, thereby realizes the nondestructive evaluation of fillet weld.
Further, described scanning frame is provided with at least one reference column, and the side of voussoir is provided with at least one pilot hole, by pilot hole and the cooperation of reference column, realizes being connected of voussoir and scanning frame, easy accessibility.
Further, described reference column and pilot hole respectively have two, are all symmetrical set, and make voussoir more reliable and stable with being connected of scanning frame.
Further, described scrambler is connected with the pin-and-hole that is positioned at scanning frame rear side by the bearing pin being positioned at before it, easy accessibility.
Further, described ultrasonic phased array detector is the ultrasonic phased array detector that can simultaneously show two kinds of imagings.
Further, described scrambler is wheel type increment rotary encoder.
Further, CSK-IIA test block refers to the CSK-IIA test block that is processed with the horizontal through hole of Ф 2 × 40mm stipulating in JB/T4730.3-2005; Described CSK-IA test block refers to the CSK-IA test block that is processed with R100 and R50 arc surface stipulating in JB/T4730.3-2005; Described reference block is identical with workpiece to be checked or close specification and has the test block of artificial defect.
Further, described reference block refers to the test block that is processed with inside cutting one place outside cutting one place inside the long dark 2mm weld seam of one of Ф 2mm through hole, 20mm, the long dark 2mm weld seam of 20mm, the dark 5mm weld seam of Ф 2 one of taper hole outside one of taper hole and the dark 5mm weld seam of Ф 2.
Further, described ultrasonic probe and the parameter of voussoir are calculated by the CIVA of Non-Destructive Testing simulation software and experiment draws, for the GIS of common specification, ultrasonic probe is selected 10L16-A00, and this probe is the planar probe of stimulating frequency 10MHz, center wafer spacing 0.31mm, 16 wafers; Voussoir is selected the SA00-N60S of 60 ° of shear refraction angles.
Another object of the present invention is to provide the nondestructive evaluation method of above-mentioned GIS end flange and cylindrical shell fillet weld apparatus for evaluating, and its step is followed successively by: determine fillet weld specification; Utilize CIVA simulation software to carry out acoustic beam covering design; The calibration of ultrasonic phased array detector; Reference block is detected; Workpiece for measurement is carried out to the scanning of direct wave hoop; Workpiece for measurement is carried out to the scanning of primary reflection hoop; Analysis of image data and workpiece for measurement grade estimation.
Described definite fillet weld specification, refers to and consults relevant drawing or actual measurement, obtains material, the wall thickness of cylindrical shell and inserts the degree of depth, fillet weld leg height etc. of end flange.
The described CIVA simulation software that utilizes carries out acoustic beam covering design, refer to and use the CIVA of Non-Destructive Testing simulation software, fillet weld is carried out to modeling, the part model of building up is carried out to wave beam emulation, thereby select suitable ultrasonic probe and voussoir, and determine focusing rule, determine the ad-hoc location of ultrasonic probe when direct projection involves primary reflection.For the GIS of common specification, focus on rule and select the sector scan of 40 ° to 70 °.When direct wave detects, voussoir forward position is to end flange apart from 10mm, and during primary reflection, end flange is arrived apart from 35mm in voussoir forward position.
The calibration of described ultrasonic phased array detector, comprises that voussoir delay calibration, fan sweeping retouch angle calibration system, sensitivity calibration.Voussoir delay calibration, the electronics that refers to the R100 cambered surface correcting probe that utilizes CSK-IA test block triggers moment and acoustic beam and enters the delay between moment of measured workpiece, to draw the survey measurements of accurate sound path, the degree of depth, surface distance.Fan sweeping is retouched angle calibration system, refers to and utilizes the R100 cambered surface of CSK-IA test block to revise the echo height difference of different deflection angle acoustic beams.Sensitivity calibration, refers to and utilizes the horizontal through hole of Ф 2 × 40mm of CSK-IIA test block to draw TCG curve.
Described detects reference block, it is the ultrasonic phased array detector using after calibration, according to CIVA simulation result, the voussoir that ultrasonic probe is housed is placed into specific position, use direct wave to detect inside 1 of Ф 2 through hole in reference block, weld seam taper hole inside cutting and weld seam, verify the detectability of defect inside this detector butt welded seam; Use primary reflection to detect outside Ф 2 through holes in reference block, weld seam taper hole outside cutting and weld seam, verify the detectability of defect inside this detector butt welded seam.
Described carries out the scanning of direct wave hoop to workpiece for measurement, with TCG evaluation line sensitivity, ultrasonic probe is placed on to specific position, along tank body hoop, uses direct wave to carry out scanning to fillet weld inside region, in scanning process, guarantee that voussoir forward position meets the demands to end flange distance.
Described carries out the scanning of primary reflection hoop to workpiece for measurement, with TCG evaluation line sensitivity, in specific position, along tank body hoop, use direct wave to carry out scanning to fillet weld exterior lateral area probe placement, in scanning process, guarantee that probe voussoir forward position meets the demands to end flange distance.
Described analysis of image data and workpiece for measurement grade estimation, refer to that an image data transmission is to computing machine, to data analysis, in conjunction with demonstrations such as B-scanning, S-scanner uni A-scannings, position, wave amplitude, length to defect and highly measuring, carries out classification according to JB/T4730.3-2005 relevant regulations to defect.
The beneficial effect that the present invention has:
1), for already present detection method, the invention solves GIS end flange and the cylindrical shell fillet weld problem without Efficient Evaluation method.Existing infiltration detects can only detect surface imperfection, cannot detect internal porosity, the defect such as fusion, underbead crack not; For the GIS tank body of being on active service, fillet weld inside region cannot be implemented infiltration and detect in addition.GIS end flange and cylindrical shell fillet weld apparatus for evaluating and nondestructive evaluation method thereof based on ultrasonic phase array provided by the invention, can realize this structure total cross-section nondestructive evaluation, can not only detect surface imperfection, can also detect inherent vice; Can not only detect military service GIS end flange and cylindrical shell lateral angle weld seam, and can also detect medial angle weld seam, comprehensive assessment the quality of this structure.
2) the present invention has also improved detection effect.With respect to already present detection method, the present invention uses single probe just can realize the scanning of multi-angle, and defect more easily finds, efficiency is higher; Can improve detection, location, quantitative and orientation accuracy to some defects; Can realize ultrasonic imaging, by graphical analysis, can provide defect detection rate, and ultrasound data can persistence, detect and there is intuitive, trackability.
Accompanying drawing explanation
Fig. 1 is the partial schematic diagram of GIS end flange of the present invention and cylindrical shell fillet weld structure.
Fig. 2 is the one-piece construction figure of GIS end flange of the present invention and cylindrical shell fillet weld.
Fig. 3 is ultrasonic phase array detecting step figure of the present invention.
Fig. 4 is direct wave data plot of the present invention.
Fig. 5 is primary reflection data plot of the present invention.
Embodiment
Below by specification drawings and specific embodiments, the present invention is described in further detail, following examples be descriptive be not determinate, can not limit protection scope of the present invention with this.
GIS end flange as shown in Figure 1-2 and cylindrical shell fillet weld ultrasonic phase array apparatus for evaluating, described scanning frame 6 is provided with two reference columns that are symmetrical set, the housing of voussoir 5 is provided with two pilot holes that are symmetrical set, and by pilot hole and the cooperation of reference column, realizes being connected of voussoir 5 and scanning frame 6.Described scrambler 7 is connected with the pin-and-hole of scanning frame rear side by the bearing pin before it.Described scrambler 7 is wheel type increment rotary encoder.Described scrambler 7 is connected with ultrasonic phased array detector 9 by data line, and described ultrasonic probe 8 surfaces are connected with voussoir 5 by bolt after coating couplant, and described ultrasonic probe is connected with ultrasonic phased array detector 9 by data line.The distance x of parameter, focusing rule and the voussoir Front distance flange of described ultrasonic probe 8, voussoir 5 has harmless detection simulation software CIVA and experiment to draw.
In the present embodiment, detected object is certain 220KV GIS tank end flange and cylindrical shell fillet weld, and as shown in Figure 3, the step of the present embodiment nondestructive evaluation method is as follows: determine fillet weld specification; Utilize CIVA software to carry out acoustic beam covering design; The calibration of ultrasonic phased array detector; Reference block is detected; Workpiece for measurement is carried out to the scanning of direct wave hoop; Workpiece for measurement is carried out to the scanning of primary reflection hoop; Analysis of image data and workpiece for measurement grade estimation.
1. determine fillet weld specification
Through consulting drawing and actual measurement is learnt, GIS tank body total length 2m, external diameter φ 774, wall thickness 8mm, material 5A02-H112, cylindrical shell insertion depth 5mm, lateral angle weld seam leg height 10mm.
2. utilize CIVA software to carry out acoustic beam covering design
Use the CIVA of Non-Destructive Testing simulation software, fillet weld is carried out to modeling, the part model of building up is carried out to wave beam emulation, select suitable probe and voussoir, and determine focusing rule, end flange is arrived apart from x in the voussoir forward position of popping one's head in while determining direct wave, primary reflection.For this specification GIS, ultrasonic probe is selected 10L16-A00(stimulating frequency 10MHz, the planar probe of 16 wafers, center wafer spacing, 0.31mm), 60 ° of voussoir SA00-N60S(shear refraction angles), focus on rule and use the sector scan of 40 ° to 70 °.When direct wave detects, voussoir forward position is to the distance 10mm of end flange, and during primary reflection, voussoir forward position is to the distance 35mm of end flange.
3. phased array instrument calibration
Comprise voussoir delay calibration, angle calibration system, sensitivity calibration.Voussoir delay calibration, utilizes the electronics of the R100 cambered surface calibration probe of CSK-IA test block to trigger moment and acoustic beam and enters the delay between moment of measured workpiece.Fan sweeping is retouched angle calibration system, utilizes the R100 cambered surface of CSK-IA test block to revise the echo height difference of different deflection angle acoustic beams.Sensitivity calibration, utilizes the horizontal through hole of Ф 2 × 40mm of CSK-IIA test block to draw TCG curve.
4. pair reference block detects
Described detects reference block, use the ultrasonic phase array detection system after calibration,, when probe voussoir forward position to end flange apart from apart from end flange 10mm, direct wave detects inside 1 of Ф 2 through hole that can accurately detect in reference block, weld seam taper hole inside cutting and weld seam; When probe voussoir forward position to end flange apart from apart from end flange 35mm, use primary event wave energy accurately to detect in reference block outside Ф 2 through holes, weld seam taper hole outside cutting and weld seam.
5. pair workpiece for measurement carries out the scanning of direct wave hoop
Voussoir forward position, to the distance 10mm of end flange, with TCG evaluation line sensitivity, is used direct wave to carry out scanning to fillet weld inside region along tank body hoop as shown in Figure 2, obtains data plot as shown in Figure 4.
6. pair workpiece for measurement carries out the scanning of primary reflection hoop
Voussoir forward position, to the distance 35mm of end flange, with TCG evaluation line sensitivity, is used primary reflection to carry out scanning to fillet weld exterior lateral area along tank body hoop as shown in Figure 2, obtains 5 data plots as shown in the figure.
7. analysis of image data and workpiece for measurement grade estimation
Image data transmission to computing machine, to data analysis.Fig. 4, Fig. 5 upper left side are that A sweeps data plot, and upper right side is that S sweeps data plot, and below is B scan-data figure.S sweeps data plot horizontal ordinate and represents reflection wave horizontal level, ordinate represents the reflection wave degree of depth, B scan-data figure represents that ultrasonic probe is from scanning starting point distance, ordinate represents the reflected signal degree of depth, the size of the variation representation signal wave amplitude of color in image, in colored situation, red expression signal wave amplitude is the strongest, and in black and white situation, more black expression signal wave amplitude is stronger.
In the direct wave data of Fig. 4, apart from starting point 172mm, 528mm, 707mm and 762mm place, find altogether 4 place's weld seam inside region 4 defects, the particularly range of linearity in 707mm to 731mm region, defect wave amplitude has exceeded TCG and has sentenced scrap wire, defect length reaches 24mm, according to according to JB/T4730.3-2005, this defect is judged to unacceptable defect.
In the primary event wave datum of Fig. 5, apart from starting point 65mm, 491mm, 733mm place, find altogether 3 place's weld seam exterior lateral area 3 defects, the particularly range of linearity in 733mm to 783mm region, defect wave amplitude has exceeded TCG and has sentenced scrap wire, defect length reaches 50mm, according to according to JB/T4730.3-2005, this defect is judged to unacceptable defect.
Visible " apparatus for evaluating and nondestructive evaluation method thereof " of the present invention, has solved the problem that GIS end flange and cylindrical shell fillet weld cannot complete detection.The present invention uses single probe just can realize the scanning of multi-angle, and defect more easily finds, detection efficiency is higher; Can improve detection, location, quantitative and orientation accuracy to some defects; Can realize ultrasonic imaging, by graphical analysis, defect detection rate is higher, and ultrasound data can persistence, detects and has intuitive, trackability.Therefore the present invention can rapidly and efficiently carry out nondestructive evaluation to GIS end flange and cylindrical shell fillet weld, can in engineering reality, well be applied.
Claims (10)
1.GIS end flange and cylindrical shell fillet weld apparatus for evaluating, comprise ultrasonic phased array detector, ultrasonic probe, voussoir, scrambler, scanning frame, CSK-IIA test block, CSK-IA test block and reference block, it is characterized in that, described ultrasonic probe is arranged on voussoir, ultrasonic probe is all connected with scanning frame with scrambler, make ultrasonic probe and scrambler synchronous operation, described scrambler is connected with ultrasonic phased array detector by data line, and described ultrasonic probe is connected with ultrasonic phased array detector by data line; Described ultrasonic probe surface scribbles couplant, by bolt, is connected with voussoir.
2. GIS end flange according to claim 1 and cylindrical shell fillet weld apparatus for evaluating, it is characterized in that, described scanning frame is provided with at least one reference column, and the side of voussoir is provided with at least one pilot hole, by pilot hole and the cooperation of reference column, realizes being connected of voussoir and scanning frame.
3. GIS end flange according to claim 2 and cylindrical shell fillet weld apparatus for evaluating, is characterized in that, described reference column and pilot hole respectively have two, are all symmetrical set.
4. GIS end flange according to claim 1 and cylindrical shell fillet weld apparatus for evaluating, is characterized in that, described scrambler is connected with the pin-and-hole that is positioned at scanning frame rear side by the bearing pin being positioned at before it.
5. GIS end flange according to claim 1 and cylindrical shell fillet weld apparatus for evaluating, is characterized in that, described ultrasonic phased array detector is the ultrasonic phased array detector that can simultaneously show two kinds of imagings.
6. GIS end flange according to claim 1 and cylindrical shell fillet weld apparatus for evaluating, is characterized in that, described scrambler is wheel type increment rotary encoder.
7. GIS end flange according to claim 1 and cylindrical shell fillet weld apparatus for evaluating, is characterized in that, described CSK-IIA test block refers to the CSK-IIA test block that is processed with the horizontal through hole of Ф 2 × 40mm stipulating in JB/T4730.3-2005; Described CSK-IA test block refers to the CSK-IA test block that is processed with R100 and R50 arc surface stipulating in JB/T4730.3-2005; Described reference block is identical with workpiece to be checked or close specification and has the test block of artificial defect.
8. GIS end flange according to claim 7 and cylindrical shell fillet weld apparatus for evaluating, it is characterized in that, described reference block refers to the test block that is processed with inside cutting one place outside cutting one place inside the long dark 2mm weld seam of one of Ф 2mm through hole, 20mm, the long dark 2mm weld seam of 20mm, the dark 5mm weld seam of Ф 2 one of taper hole outside one of taper hole and the dark 5mm weld seam of Ф 2.
9. GIS end flange according to claim 1 and cylindrical shell fillet weld apparatus for evaluating, it is characterized in that, described ultrasonic probe and the parameter of voussoir are calculated by the CIVA of Non-Destructive Testing simulation software and experiment draws, for the GIS of common specification, ultrasonic probe is selected 10L16-A00, and this probe is the planar probe of stimulating frequency 10MHz, center wafer spacing 0.31mm, 16 wafers; Voussoir is selected the SA00-N60S of 60 ° of shear refraction angles.
10. the nondestructive evaluation method of GIS end flange and cylindrical shell fillet weld apparatus for evaluating described in claim 1-9 any one, its step is followed successively by: determine fillet weld specification; Utilize CIVA simulation software to carry out acoustic beam covering design; The calibration of ultrasonic phased array detector; Reference block is detected; Workpiece for measurement is carried out to the scanning of direct wave hoop; Workpiece for measurement is carried out to the scanning of primary reflection hoop; Analysis of image data and workpiece for measurement grade estimation.
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