CN110308202A - A kind of station boiler monowall tube weld seam supersonic detection method - Google Patents
A kind of station boiler monowall tube weld seam supersonic detection method Download PDFInfo
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- CN110308202A CN110308202A CN201910480633.XA CN201910480633A CN110308202A CN 110308202 A CN110308202 A CN 110308202A CN 201910480633 A CN201910480633 A CN 201910480633A CN 110308202 A CN110308202 A CN 110308202A
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- weld seam
- probe
- wave
- ultrasonic
- detection method
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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
-
- 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
- G01N29/24—Probes
-
- 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
-
- 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
Abstract
The present invention relates to a kind of station boiler monowall tube weld seam supersonic detection methods, belong to thermal power plant's heating surface tube field of non destructive testing.The present invention is the following steps are included: weld reinforcement to be detected is polished, surrounding grinding process, until any surface finish；Brush couplant；Thickness measuring and material confirmation are carried out to water screen tube；Ultrasonic wave longitudinal wave normal probe and transverse wave double-bevel detector are chosen, the measurement of Front distance, K value is carried out；Make distance-amplitude curve；Ultrasonic wave longitudinal wave normal probe is ridden in welded joints, is scanned back and forth, shuttle-scanning 2-3 times；Ultrasonic transverse wave angle probe is placed on around weld seam, in cleaning area daubing coupling agent, carries out zigzag scan Z, probe is moved to abutting position while welding every time, carries out a circle scanning；Observe dynamic waveform；Determine defect to be checked；Wave recording carries out Electronic saving；Fill in papery detection record；Scene cleaning, arranges instrument；Provide flaw detection report.
Description
Technical field
The present invention relates to a kind of station boiler monowall tube weld seam supersonic detection methods, belong to thermal power plant's heating surface
Pipe field of non destructive testing.
Background technique
In order to improve coal-fired power station boiler heat exchange efficiency, saving fuel is used, and improves power generation field economic benefit,
In large medium-size boiler " four pipe " manufacture, weld seam high number, a 660MW supercritical unit heating surface weld bond is about more than 40,000, these
Heating surface tube specification is mostly between φ 30mm- φ 60mm, and thickness between 4mm-8mm, welded by piping factory by these weld seam parts,
Referred to as equipment weld bond, the overwhelming majority are welded by erecting bed, referred to as installed welding.
In view of this, disclosing a kind of ultrasonic examination side in the patent document application No. is 201410148594.0
Method, ultrasonic flaw detecting device and longitudinal wave shear wave climb wave Integral ultrasonic angle probe.In recent years due to installation unit weld bond quality
The problem of difference, inspection ratio and the method for inspection, leads to many unqualified weld bonds investment therrmodynamic systems operation power generations of many power plant, this
When Unit Commitment, load variations, depth peak regulation, burning deteriorate leakage booster easily occurs for the unqualified weld bond of kind, fiery
Power plant occurs leakage booster and centainly causes the unplanned outage of unit, or even the accident that causes casualties.
Summary of the invention
It is an object of the invention to overcome the shortcomings of in the prior art based on radiographic inspection, radiographic inspection status requirement
Height, in the continuously coupled water-cooling wall of film-type tube bank, radiographic inspection cannot 100% realize weld seam scanning, wherein 3 points and 9 points
Setting is flaw detection " dead angle " (defect can not find or judge), and ray detection cost is very high, and process complexity is more particularly to existing
Film making, dark room operation comment piece etc..
And provide a kind of reasonable in design, it reduces costs, makes up the defect detection of " dead angle " position, especially in machine
Group is faced repair or repair during, shorten the time of scene flaw detection, while guaranteeing weldquality, for the electricity raced against time that generates electricity in time
It stands Technique in Boiler Membrane Water Cooled Wall pipe weld seam supersonic detection method.
Technical solution used by the present invention solves the above problems is: the station boiler monowall tube weld joint ultrasonic
Method of detection, it is characterized in that: the following steps are included:
Step 1: weld reinforcement to be detected is polished, surrounding grinding process, until any surface finish；
Step 2: brushing couplant；
Step 3: carrying out thickness measuring and material confirmation to water screen tube；
Step 4: choosing ultrasonic wave longitudinal wave normal probe and transverse wave double-bevel detector, the measurement of Front distance, K value is carried out；
Step 5: production distance-amplitude curve；
Step 6: ultrasonic wave longitudinal wave normal probe is ridden in welded joints, scan back and forth, shuttle-scanning 2-3 times；
Step 7: ultrasonic transverse wave angle probe is placed on around weld seam, in cleaning area daubing coupling agent, carries out zigzag and sweep
It looks into, probe is moved to abutting position while welding every time, carries out a circle scanning；
Step 8: observation dynamic waveform；
Step 9: determining defect to be checked；
Step 10: wave recording or progress Electronic saving；
Step 11: filling in papery detection record；
Step 12: scene cleaning, arranges instrument；
Step 13: providing flaw detection report.
The station boiler monowall tube weld seam supersonic detection method is on the basis of conventional ray detection, by beating
Weld seam is ground, flaw detection direction is increased, to realize discovery weld seam internal flaw, weldquality is controlled from inspection, it is ensured that nothing does not conform to
Lattice weld bond puts into therrmodynamic system.
In addition, also can control in four main tubes of boiler welding process, improve welding personnel weld horizontal, it can multiple-aspect control
The welding quality of boiler heating surface, it is ensured that safe operation of the boiler.
Further, in the step 2, the couplant used is scanned as machine oil, selects machine oil couplant, materials are convenient,
Easy to clean.
Further, in the step 7, the operating frequency range of ultrasonic transverse wave angle probe is 5MHz, and the probe is arranged
Frequency, ultrasonic wavelength is shorter, and resolving power is high, it is found that the ability of minimum defect is strong, it can be ensured that probe work is in optimum state.
Further, in the step 6, the operating frequency range of ultrasonic wave longitudinal wave normal probe is 5MHz, and the probe is arranged
Frequency, ultrasonic wavelength is shorter, and resolving power is high, it is found that the ability of minimum defect is strong, it can be ensured that probe work is in optimum state.
Further, in the step 7, the wafer size of ultrasonic transverse wave angle probe is 6mm × 6mm, selects the ruler
Very little, though ultrasonic energy is small (tube wall is relatively thin, is able to satisfy penetrability completely), coupling performance is good, can be close to tube wall, energy loss
Very little.
Further, in the step 7, the K value of ultrasonic transverse wave angle probe is 3, selects the incident angle, can ensure that
Internal flaw detection.
Further, in the step 6, the wafer size of ultrasonic wave longitudinal wave normal probe is φ 10mm, selects the size,
Though ultrasonic energy is small (tube wall is relatively thin, is able to satisfy penetrability completely), coupling performance is good, can be close to tube wall, and energy loss is very
It is small.
Further, in the step 4, the scanning speed of transverse wave double-bevel detector and longitudinal wave normal probe is 20mm/s-30mm/
S selects the speed that can prevent defect missing inspection.
Compared with prior art, the invention has the following advantages that
1, ultrasonic wave longitudinal wave normal probe vertical weld is respectively adopted in the detection method that the present invention uses and carries out scanning, ultrasonic wave cross
Wave angle probe carries out saw-tooth sweep along weld seam, realizes X-axis, Y axis scanning, can read position, shape and the ruler of defect
Very little, detection accuracy is improved, and detection efficient is improved, and improves product quality.
2, the couplant machine oil used in the present invention, will not corrode weld seam and base material, reduce impurity to detection accuracy
It influences, further improves the accuracy of detection.
3, the operating frequency range of ultrasonic transverse wave angle probe and longitudinal wave normal probe of the present invention is 5MHz, and the frequency model is arranged
The work that can ensure to pop one's head in is enclosed in optimum state, and resolving power is high, finds the ability enhancing of minimum defect.
4, the surface sweeping speed of transverse wave double-bevel detector and longitudinal wave normal probe of the present invention is 20mm/s-30mm/s, and the speed is arranged
It can prevent defect missing inspection.
Detailed description of the invention
Fig. 1 is the schematic diagram of the transverse wave double-bevel detector flaw detection of the embodiment of the present invention.
Fig. 2 is the schematic diagram of the longitudinal wave normal probe flaw detection of the embodiment of the present invention.
Fig. 3 is distance-amplitude curve schematic diagram of the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to shown in Fig. 1 to Fig. 3, it should however be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc. are only used
To cooperate the revealed content of specification, so that those skilled in the art understands and reads, being not intended to limit the invention can
The qualifications of implementation, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where not influencing the effect of present invention can be generated and the purpose that can reach, it should all still fall in disclosed skill
In the range of art content can cover.Meanwhile if in this specification with reference as "upper", "lower", "left", "right", " centre " and
The term of " one " etc. is merely convenient to being illustrated for narration, rather than to limit the scope of the invention, relativeness
It is altered or modified, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the present invention.
Station boiler monowall tube weld seam supersonic detection method in the present embodiment, comprising the following steps:
Step 1: weld reinforcement to be detected is polished, surrounding grinding process, until any surface finish；
Step 2: brushing couplant；
Step 3: carrying out thickness measuring and material confirmation to water screen tube；
Step 4: choosing ultrasonic wave longitudinal wave normal probe and transverse wave double-bevel detector, the measurement of Front distance, K value is carried out；
Step 5: production distance-amplitude curve；
Step 6: ultrasonic wave longitudinal wave normal probe is ridden in welded joints, scan back and forth, shuttle-scanning 2-3 times；
Step 7: ultrasonic transverse wave angle probe is placed on around weld seam, in cleaning area daubing coupling agent, carries out zigzag and sweep
It looks into, probe is moved to abutting position while welding every time, carries out a circle scanning；
Step 8: observation dynamic waveform；
Step 9: determining defect to be checked；
Step 10: wave recording or progress Electronic saving；
Step 11: filling in papery detection record；
Step 12: scene cleaning, arranges instrument；
Step 13: providing flaw detection report.
Preferably, scanning the couplant used in step 2 as machine oil, machine oil couplant is selected, materials are convenient, Yi Qing
Reason.
Preferably, the operating frequency range of ultrasonic transverse wave angle probe is 5MHz in step 7, probe frequency is set
Rate, ultrasonic wavelength is shorter, and resolving power is high, it is found that the ability of minimum defect is strong, it can be ensured that probe work is in optimum state.
Preferably, the operating frequency range of ultrasonic wave longitudinal wave normal probe is 5MHz in step 6, probe frequency is set
Rate, ultrasonic wavelength is shorter, and resolving power is high, it is found that the ability of minimum defect is strong, it can be ensured that probe work is in optimum state.
Preferably, the wafer size of ultrasonic transverse wave angle probe is 6mm × 6mm, selects the size in step 7, surpass
Though acoustic wave energy is small (tube wall is relatively thin, is able to satisfy penetrability completely), coupling performance is good, can be close to tube wall, energy loss very little.
Preferably, the K value of ultrasonic transverse wave angle probe is 3 in step 7, the incident angle is selected, can ensure that inside
Defect detection.
Preferably, the wafer size of ultrasonic wave longitudinal wave normal probe is φ 10mm in step 6, the size is selected, ultrasound
Though wave energy is small (tube wall is relatively thin, is able to satisfy penetrability completely), coupling performance is good, can be close to tube wall, energy loss very little.
Preferably, the scanning speed of transverse wave double-bevel detector and longitudinal wave normal probe is 20mm/s-30mm/s, choosing in step 4
Defect missing inspection can be prevented by selecting the speed.
Preferably, in step 4, it is specific as follows:
In DL-1 test block, by the semicircle cambered surface of alignment probe R25, R50, gain button is adjusted, is showing R50 reflection wave amplitude
80% height of device, R25 reflect wave amplitude not less than 40% height of display, with grade ruler measuring probe front end and R50 cambered surface
Flat-top end distance value L1, pass through forward position A calculation formula: A=50-L1；
Probe is placed in DL-1 test block, the through-hole of selected depth h=5mm, φ 1mm measure, and mobile probe finds this hole
Afterwards, when reflecting wave amplitude highest, measure distance L of the Front distance apart from test block end with grade ruler, by formula β=
Arc tg [(L+A)/5] is to get K value out, such as L=12mm, A=3mm, then K=3.
During station boiler is installed or pipe is changed in maintenance, technique is extremely complex, the time is long needed for ray detection, safety
It is required that high.It specifically needs X-ray to carry out operation, handles radiation safety apart from work ticket, made film and needed darkroom disposal, needed
Veteran personnel carry out to defects assessment, and cannot come out the defects detection in " dead zone ".And the method for the present invention is selected,
Detection time is shortened, can also be handled by disfigurement discovery and immediately, has vital effect to capital construction phase or turn(a)round is shortened.
In addition, it should be noted that, the specific embodiments described in this specification, the shape of parts and components are named
Title etc. can be different, and above content is only to structure of the invention example explanation described in this specification.It is all according to
According to equivalence changes or simple change that the invention patent design structure, feature and principle is done, it is included in this hair
In the protection scope of bright patent.Those skilled in the art can do described specific embodiment various
The mode that the modify or supplement or adopt of various kinds is similar substitutes, and without departing from structure of the invention or surmounts present claims
Range defined in book, is within the scope of protection of the invention.
Claims (8)
1. a kind of station boiler monowall tube weld seam supersonic detection method, it is characterised in that: the following steps are included:
Step 1: weld reinforcement to be detected is polished, surrounding grinding process, until any surface finish；
Step 2: brushing couplant；
Step 3: carrying out thickness measuring and material confirmation to water screen tube；
Step 4: choosing ultrasonic wave longitudinal wave normal probe and transverse wave double-bevel detector, the measurement of Front distance, K value is carried out；
Step 5: production distance-amplitude curve；
Step 6: ultrasonic wave longitudinal wave normal probe is ridden in welded joints, scan back and forth, shuttle-scanning 2-3 times；
Step 7: ultrasonic transverse wave angle probe is placed on around weld seam, in cleaning area daubing coupling agent, carries out zigzag and sweep
It looks into, probe is moved to abutting position while welding every time, carries out a circle scanning；
Step 8: observation dynamic waveform；
Step 9: determining defect to be checked；
Step 10: wave recording or progress Electronic saving；
Step 11: filling in papery detection record；
Step 12: scene cleaning, arranges instrument；
Step 13: providing flaw detection report.
2. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 2, scans the couplant used as machine oil.
3. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 7, the working frequency of ultrasonic transverse wave angle probe is 5MHz.
4. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 6, the working frequency of ultrasonic wave longitudinal wave normal probe is 5MHz.
5. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 7, the wafer size of ultrasonic transverse wave angle probe is 6mm × 6mm.
6. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 7, the K value of ultrasonic transverse wave angle probe is 3.
7. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 6, the wafer size of ultrasonic wave longitudinal wave normal probe is φ 10mm.
8. station boiler monowall tube weld seam supersonic detection method according to claim 1, it is characterised in that: institute
It states in step 4, the scanning speed of transverse wave double-bevel detector and longitudinal wave normal probe is 20mm/s-30mm/s.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640387A (en) * | 2021-08-25 | 2021-11-12 | 国能朔黄铁路发展有限责任公司 | Railway thermite welding rib flaw detection method and railway thermite welding rib flaw detection device |
| CN113649739A (en) * | 2021-09-08 | 2021-11-16 | 中国铁建重工集团股份有限公司 | Weld cleaning system and weld cleaning method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640387A (en) * | 2021-08-25 | 2021-11-12 | 国能朔黄铁路发展有限责任公司 | Railway thermite welding rib flaw detection method and railway thermite welding rib flaw detection device |
| CN113649739A (en) * | 2021-09-08 | 2021-11-16 | 中国铁建重工集团股份有限公司 | Weld cleaning system and weld cleaning method |
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