CN101750034A - Dissimilar metal welding line ultrasonic creeping wave testing method - Google Patents
Dissimilar metal welding line ultrasonic creeping wave testing method Download PDFInfo
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- CN101750034A CN101750034A CN200810183107A CN200810183107A CN101750034A CN 101750034 A CN101750034 A CN 101750034A CN 200810183107 A CN200810183107 A CN 200810183107A CN 200810183107 A CN200810183107 A CN 200810183107A CN 101750034 A CN101750034 A CN 101750034A
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Abstract
The invention belongs to an ultrasonic creeping wave testing method, particularly relates to a dissimilar metal welding line ultrasonic creeping wave testing method, which comprises the following steps: (1) calibrating instrument depth measurement, (2) demarcating sensitivity, and (3) testing. The invention has the effects that: (1) the effect of creeping wave for defect depth measurement is that the creeping wave can test the depth of 0.5 to 9mm, and the depth measurement error is plus and minus 0.5mm, (2) the effect of creeping wave for defect height measurement is that the creeping wave can perform the height measurement for the planar defect with the self height of larger than or equal to 2mm, with the measurement error is plus and minus 1mm.
Description
Technical field
The invention belongs to a kind of ultrasonic detection method, be specifically related to a kind of dissimilar metal welding line ultrasonic creeping wave testing method.
Background technology
The dissimilar metal welding is meant two soldered metal species differences.Because the kind difference of soldered metal causes weld seam various defectives may occur.Wherein most typical defective is a HOT CRACK FOR WELDING P, promptly has crackle in the weld seam, single appearance of crackle or appearance continuously.There is a group to be called little opening crackle in the HOT CRACK FOR WELDING P, little opening crackle is meant that crack length is generally at 2～3mm, flaw height (the vertical height of crackle) is less than 3mm, about crackle A/F 0.1mm, generally in 3mm, part is at 3～6mm for depth of defect (crackle is apart from the height of face of weld).
Because welding back dissimilar metal is widely used in the nuclear reactor, and the security requirement of nuclear reactor is very high, nuclear reactor also can quicken the speed of worsening of weld seam internal fissure owing to produce radioactivity simultaneously, therefore must effectively detect these HOT CRACK FOR WELDING P.
Conventional detection generally comprises three kinds of liquid infiltration detection method, volumetric detection method RT and volumetric detection method UT.Wherein liquid infiltration detection method is the method that detects with liquid butt welded seam surface, and this method can only detect the face of weld flaws, can't detect to bury defective, and also can't determine the size of its short transverse for detected defective.Volumetric detection method RT and volumetric detection method UT all can detect most of defective, but omission can occur when the direction of defective becomes special angle with the direction of ray, and this method can not detect little opening crackle.
Summary of the invention
The purpose of this invention is to provide a kind of little opening crackle that can effectively detect dissimilar metal welding line, and measure the dissimilar metal welding line ultrasonic creeping wave testing method of the degree of depth, length and the height dimension of little opening crackle.
The present invention is achieved in that a kind of dissimilar metal welding line ultrasonic creeping wave testing method, comprises the steps:
(1) instrument depth survey calibration
Utilize special depth to measure calibration block ultrasonic instrument is carried out the depth survey calibration; It is that tubing cuts piece along its axial fritter that described special depth is measured calibration block, measure three flat-bottom holes that the calibration block top is drilled with distance circle side face different depth at special depth, regulate the correlation parameter of instrument, make instrument for the flat-bottom hole of these three different depths in the depth value error actual of the degree of depth displayed value on the instrument with it within ± 0.5mm scope;
(2) sensitivity is demarcated
The sensitivity that wave sensitivity is demarcated the test block calibrating instrument is climbed in utilization; Describedly climb wave sensitivity to demarcate test block be that tubing cuts piece along its axial fritter, process horizontal through hole (4) in the place of climbing wave sensitivity demarcation test block distance from top periphery highest point 2mm, the diameter of horizontal through hole (4) is 1.6mm, the method of demarcating is mobile creeping wave probe, alignment sensitivity is demarcated dark 2mm in the test block, the horizontal through hole (4) of diameter 1.6mm, find the maximum reflection ripple of horizontal through hole (4), regulate the sensitivity of instrument, make reflection wave reach 80% height all over the screen, the sensitivity of instrument at this moment is the basic sensitivity of detection;
(3) detect
Detection comprises depth detection and height detection.
Carry out scanning on the dissimilar metal welding line that will detect, find defective, the mobile probe position makes flaw echo be shown as maximum on screen, and the display depth of instrument is the degree of depth of defective at this moment; The flaw height measuring method is: 1. regulate detection sensitivity, make that noise signal is instrument 10%～20% height all over the screen; 2. move forward and backward probe, according to dynamic waveform, seek the small peak that main peak has motility together that is accompanied by before and after the defective main peak, the small peak of following that is positioned at before the main peak is the reflection wave of the upper extreme point of defective, and the small peak of following that is positioned at behind the main peak is the lower extreme point reflection wave of defective; 3. mobile probe, the lower end reflection wave of defective is found the highest, the degree of depth of record lower end reflection spot, same method is measured the degree of depth of defective upper end reflection spot, the depth difference of end points is the height of defective up and down.
Use effect of the present invention to be: (1) climbs ripple to the depth of defect measurement effect: climb the degree of depth that wave energy enough detects at 0.5～9mm, the depth survey error is ± 0.5mm.(2) climb ripple to the flaw height measurement effect: can carry out height more than or equal to the planarity defective of 2mm to oneself height and measure, its measuring error is ± 1mm.
Description of drawings
Fig. 1 is that special depth is measured the calibration block front elevation
Fig. 2 is that special depth is measured the calibration block vertical view
Fig. 3 is that special depth is measured the calibration block right view
Fig. 4 climbs wave sensitivity to demarcate the test block front elevation
Fig. 5 climbs wave sensitivity to demarcate the test block vertical view
Fig. 6 climbs wave measurement flaw height oscillogram
Among the figure: 1. flat-bottom hole 1., 2. flat-bottom hole 2., 3. flat-bottom hole 3., 4. horizontal through hole, A. upper extreme point reflection wave, B. lower extreme point reflection wave, C. defective main peak, D. noise signal.
Embodiment
A kind of dissimilar metal welding line ultrasonic creeping wave testing method comprises the steps:
(1) instrument depth survey calibration
Utilize special depth to measure calibration block ultrasonic instrument is carried out the depth survey calibration.Described ultrasonic instrument comprises creeping wave probe and is used for the computing machine of data processing that this creeping wave probe is known creeping wave probe.As Fig. 1, Fig. 2, shown in Figure 3, it is that tubing cuts piece along its axial fritter that special depth is measured calibration block, measure three flat-bottom holes that the calibration block top is drilled with distance circle side face different depth at special depth, three flat-bottom holes all are parallel to tubing and axially and from the test block top get into axis of a weld, and the diameter of flat-bottom hole is 2mm.Diameter is 2mm to Calibration Method in the depth survey calibration block in order to utilize, the flat-bottom hole that the degree of depth is different, regulate the correlation parameter of instrument, make for the flat-bottom hole of these three different depths in the depth value error actual of the degree of depth displayed value on the instrument with it within ± 0.5mm scope.
(2) sensitivity is demarcated
The sensitivity that wave sensitivity is demarcated the test block calibrating instrument is climbed in utilization.As Fig. 4, shown in Figure 5ly climb wave sensitivity to demarcate test block be that tubing cuts piece along its axial fritter, process horizontal through hole 4 climbing the place that wave sensitivity demarcates test block distance from top periphery highest point 2mm.The diameter of horizontal through hole 4 is 1.6mm.The method of demarcating is mobile creeping wave probe, and alignment sensitivity is demarcated dark 2mm in the test block, the horizontal through hole 4 of diameter 1.6mm, find the maximum reflection ripple of horizontal through hole 4, regulate the sensitivity of instrument, make reflection wave reach 80% height all over the screen, the sensitivity of instrument at this moment is the basic sensitivity of detection.
(3) detect
Detection comprises depth detection and height detection.
Carry out scanning on the dissimilar metal welding line that will detect, find defective, the mobile probe position makes flaw echo be shown as maximum on screen, and the display depth of instrument is the degree of depth of defective at this moment.The flaw height measuring method is: 1. regulate detection sensitivity, make that noise signal is instrument 10%～20% height all over the screen, noise signal is among Fig. 6 shown in the D.2. move forward and backward probe, according to dynamic waveform, seek the small peak that main peak has motility together that is accompanied by of defective main peak front and back, being positioned at the preceding small peak of following of main peak is the reflection wave of the upper extreme point of defective, the small peak of following that is positioned at behind the main peak is the lower extreme point reflection wave of defective, and the reflection of end points involves the defective main peak and is respectively shown in A, B among Fig. 6, the C up and down.3. mobile probe, the lower end reflection wave of defective is found the highest, the degree of depth of record lower end reflection spot, same method is measured the degree of depth of defective upper end reflection spot, the depth difference of end points is the height of defective up and down.
Claims (1)
1. a dissimilar metal welding line ultrasonic creeping wave testing method is characterized in that: comprise the steps:
(1) instrument depth survey calibration
Utilize special depth to measure calibration block ultrasonic instrument is carried out the depth survey calibration; It is that tubing cuts piece along its axial fritter that described special depth is measured calibration block, measure three flat-bottom holes that the calibration block top is drilled with distance circle side face different depth at special depth, regulate the correlation parameter of instrument, make instrument for the flat-bottom hole of these three different depths in the depth value error actual of the degree of depth displayed value on the instrument with it within ± 0.5mm scope;
(2) sensitivity is demarcated
The sensitivity that wave sensitivity is demarcated the test block calibrating instrument is climbed in utilization; Describedly climb wave sensitivity to demarcate test block be that tubing cuts piece along its axial fritter, process horizontal through hole (4) in the place of climbing wave sensitivity demarcation test block distance from top periphery highest point 2mm, the diameter of horizontal through hole (4) is 1.6mm, the method of demarcating is mobile creeping wave probe, alignment sensitivity is demarcated dark 2mm in the test block, the horizontal through hole (4) of diameter 1.6mm, find the maximum reflection ripple of horizontal through hole (4), regulate the sensitivity of instrument, make reflection wave reach 80% height all over the screen, the sensitivity of instrument at this moment is the basic sensitivity of detection;
(3) detect
Detection comprises depth detection and height detection.
Carry out scanning on the dissimilar metal welding line that will detect, find defective, the mobile probe position makes flaw echo be shown as maximum on screen, and the display depth of instrument is the degree of depth of defective at this moment; The flaw height measuring method is: 1. regulate detection sensitivity, make that noise signal is instrument 10%～20% height all over the screen; 2. move forward and backward probe, according to dynamic waveform, seek the small peak that main peak has motility together that is accompanied by before and after the defective main peak, the small peak of following that is positioned at before the main peak is the reflection wave of the upper extreme point of defective, and the small peak of following that is positioned at behind the main peak is the lower extreme point reflection wave of defective; 3. mobile probe, the lower end reflection wave of defective is found the highest, the degree of depth of record lower end reflection spot, same method is measured the degree of depth of defective upper end reflection spot, the depth difference of end points is the height of defective up and down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101831079A CN101750034B (en) | 2008-12-11 | 2008-12-11 | Dissimilar metal welding line ultrasonic creeping wave testing method |
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| CN2008101831079A CN101750034B (en) | 2008-12-11 | 2008-12-11 | Dissimilar metal welding line ultrasonic creeping wave testing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280458A (en) * | 2014-11-03 | 2015-01-14 | 南昌航空大学 | Quantitative evaluation method for detecting hole type defect by adopting ultrasonic phased array |
| CN106770394A (en) * | 2017-02-16 | 2017-05-31 | 温州大学 | The three-dimensional appearance of metal welding seam internal flaw and the lossless detection method of stress characteristics |
| CN108254441A (en) * | 2017-12-08 | 2018-07-06 | 内蒙古北方重工业集团有限公司 | Thick-wall tube inner surface cracks development length contact method supersonic detection method |
-
2008
- 2008-12-11 CN CN2008101831079A patent/CN101750034B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280458A (en) * | 2014-11-03 | 2015-01-14 | 南昌航空大学 | Quantitative evaluation method for detecting hole type defect by adopting ultrasonic phased array |
| CN106770394A (en) * | 2017-02-16 | 2017-05-31 | 温州大学 | The three-dimensional appearance of metal welding seam internal flaw and the lossless detection method of stress characteristics |
| CN108254441A (en) * | 2017-12-08 | 2018-07-06 | 内蒙古北方重工业集团有限公司 | Thick-wall tube inner surface cracks development length contact method supersonic detection method |
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| CN101750034B (en) | 2011-08-17 |
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