CN103529124B - A kind of TOFD monitors the method for steel plate intermittent sandwich expansion - Google Patents
A kind of TOFD monitors the method for steel plate intermittent sandwich expansion Download PDFInfo
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- CN103529124B CN103529124B CN201310463192.5A CN201310463192A CN103529124B CN 103529124 B CN103529124 B CN 103529124B CN 201310463192 A CN201310463192 A CN 201310463192A CN 103529124 B CN103529124 B CN 103529124B
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Abstract
The invention discloses a kind of method that TOFD monitors the expansion of steel plate intermittent sandwich, its mechanical property first determining the steel plate manufacturing this column meets the demands; Then the inside and outside surface of the wing plate containing intermittent sandwich defect is welded with the supporting leg of guide rail, guide rail quantity is set according to the size of intermittent sandwich defect area, permanent numbering lattice 1, lattice 2 are carried out to sub-box ... and adjust instrument parameter; Again the steel plate in each sub-box is tested, the highest wave amplitude of the intermittent sandwich defect in each sub-box, length dimension are all measured; Afterwards during blowing out, then the steel plate in this sub-box is monitored, by the assay of intermittent sandwich defect in each sub-box and previous comparing.The present invention utilizes the expansion of the inner intermittent sandwich defect of TOFD technical monitoring steel plate, and can accurately the highest wave amplitude, length dimension etc. of same defect in each inspection be contrasted by exclusive guideway, effectively can monitor the expansion of this type of defect.
Description
Technical field
The present invention relates to a kind of method that TOFD monitors the expansion of steel plate intermittent sandwich.
Background technology
Along with Large Copacity, the greatly developing of high parameter genset, the steel plate of steel construction head tree wing plate is more and more thicker.Steel plate is thicker occurs that in the process of rolling the possibility of interlayer defect is larger.But domestic current standard has just been made the chemical composition, mechanical test (stretch, bend, impact), surface quality etc. of steel plate and has been reviewed regulation, mandatory requirement manufacture of steel structure factory does not carry out inherent vice ultrasonic testing to purchased steel plate before blanking processing, and the domestic quality standard not having the ultrasonic testing of steel construction steel plate inherent vice.As long as therefore the mechanical test of steel plate is qualified, the ultrasound wave that can not carry out steel plate is reviewed.
If head tree wing plate inside exists intermittent sandwich defect, (steel plate is thoroughly layering not, but specify by JB/T4730-2005 standard, general pulse reflection supersonic wave detects and has reached V level, the poorest rank), these intermittent sandwich are about 2-4mm, disperse is inner in steel plate, but mechanical property (mechanical property is the main basis of steel construction strength and stability) is not impacted, in addition the factor such as power plant construction duration short, the written quality assurance of manufacture of steel structure factory, containing intermittent sandwich defect in the head tree wing plate steel plate of a lot of power plant.Therefore adopt suitable method to carry out periodic monitoring to this type of intermittent sandwich defect, just become the important means of prevention Defect expanding.
At present, the detection method of steel plate inherent vice extensively adopts general pulse reflection supersonic wave, but this type of defect has reached V level (the poorest level), and therefore general pulse reflection supersonic wave method has been difficult to the requirement meeting monitoring Defect expanding.And TOFD technology is very responsive to little defect, especially can reach ± 0.3mm to the monitoring capability of the Defect expanding being parallel to its sound beam direction, extremely be applicable to the spread scenarios of the intermittent sandwich defect of monitoring steel plate.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of can facilitating, accurately to the TOFD method of inspection that power plant boiler steel construction head tree steel plate inner intermittent sandwich Defect expanding situation is monitored.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of TOFD monitors the method for steel plate intermittent sandwich expansion, its gordian technique is: described monitoring method has been come by exclusive guideway, and described exclusive guideway comprises at least two to being symmetrically set in wing plate both sides and perpendicular to the longitudinal rail of intermittent sandwich defect; Described longitudinal rail comprises stainless sheet steel and supporting leg, and two supporting legs are vertically brazed in the two ends of described stainless sheet steel, and at the wing plate containing intermittent sandwich defect on the surface, adjacent longitudinal rail forms grid in the other end soldering of described supporting leg.
Said method comprising the steps of:
1) by carrying out the detection of general pulse reflection supersonic wave to thermal power plant's steel construction head tree wing plate, determine to there is intermittent sandwich, and be chosen as V level by JB/T4730-2005 standard, and the mechanical property determining the steel plate manufacturing this column meeting standard-required;
2) welded with the supporting leg of longitudinal rail on the inside and outside surface of the described wing plate containing intermittent sandwich defect, longitudinal rail exists in pairs on the inside and outside surface of described wing plate, and horizontal level is identical; Longitudinal rail quantity is set according to the size of intermittent sandwich defect area, then forms grid between longitudinal rail, and permanent numbering lattice 1, lattice 2 are carried out to each described grid
3) instrument parameter is adjusted: select TOFD probe; Start TOFD instrument, respectively described TOFD probe is placed in containing in the longitudinal rail on the inside and outside surface of the described wing plate of intermittent sandwich defect, thus make the described TOFD probe being placed in one side send acoustic beam, and the described TOFD probe being placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with intermittent sandwich defect length direction; Select the Φ 1mm through hole sensitivity with intermittent sandwich defective locations same depth; Other Selecting parameter default values;
4) steel plate in described grid carries out TOFD inspection, the highest wave amplitude of the defect in each described grid, length dimension is measured, and saves as picture format by number;
5) afterwards blowing out time, again TOFD inspection is carried out to the steel plate in grid described in this, by the assay of defect in the described grid at each same position place and previous comparing, when finding that the length of the intermittent sandwich defect in grid described in this expands to some extent, the described wing plate containing intermittent sandwich defect of tackling this column carries out sampling and carries out mechanical property test and whether meet request for utilization with checking or change this column.
The height that the height sum of described stainless sheet steel and described supporting leg and described TOFD pop one's head in adapts; The length of described stainless sheet steel adapts with the distance of the described wing plate inside surface outer rim to web place that contain intermittent sandwich defect; The length that the width of described grid and described TOFD pop one's head in adapts.
The beneficial effect that produces of technique scheme is adopted to be: because the TOFD pair of defectoscopy precision parallel with its acoustic beam is high, monitoring Defect expanding ability can reach ± and 0.3 millimeter, the present invention utilizes the expansion of the inner intermittent sandwich defect of TOFD technical monitoring steel plate, the length direction of intermittent sandwich defect is parallel to TOFD sound beam direction, ensure that monitoring sensitivity and reliability, and can be accurate by exclusive guideway, intuitively by the highest wave amplitude of same defect in each inspection, length dimensions etc. contrast, effectively can monitor the expansion of this type of defect, improve the security of similar unit.
Accompanying drawing explanation
Fig. 1 is power plant boiler steel construction head tree structural representation;
Fig. 2 is head tree wing plate inner intermittent sandwich defect diagrammatic cross-section;
Fig. 3 is the structural representation of exclusive guideway;
Fig. 4 is the A-A direction view of Fig. 3;
Fig. 5 is that exclusive guideway soldering is containing the schematic diagram on defect wing plate;
Fig. 6 is the B-B direction view of Fig. 5;
Fig. 7 is TOFD technical monitoring intermittent sandwich Defect expanding schematic diagram;
Wherein, 1, wing plate; 2, web, 3, supporting leg; 4, stainless sheet steel; 5, grid; 6, TOFD probe; 7, TOFD center probe line; H1, stainless sheet steel and height of landing leg sum; H2, Thin Stainless Steel plate height; The length of L1, single intermittent sandwich defect.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
See attached Fig. 1 and 2, the situation of the intermittent sandwich defect of wing plate 1 inside described in known power plant boiler steel construction head tree.
See accompanying drawing 3-7, the exclusive guideway in the present invention comprises at least two to being symmetrically set in wing plate 1 both sides and perpendicular to the longitudinal rail of intermittent sandwich defect; Longitudinal rail comprises stainless sheet steel 4 and supporting leg 3; After described supporting leg 3 is vertically brazed in the two ends of described stainless sheet steel 4, again by the direction perpendicular to defect trend, soldering is being formed a pair containing on the inside and outside surface of described wing plate 1 of intermittent sandwich defect respectively, and the horizontal level of every a pair is identical, then some to after disposed at equal distance, form described grid 5; The height sum of described stainless sheet steel 4 and described supporting leg 3 and described TOFD pop one's head in 6 height adapt; The length of described stainless sheet steel 4 adapts with the distance of the described wing plate 1 inside surface outer rim to described web 2 place that contain intermittent sandwich defect.The width of described grid 5 and described TOFD pop one's head in 6 length adapt.
Monitoring step of the present invention is as follows:
1, by carrying out the detection of general pulse reflection supersonic wave to wing plate 1 described in thermal power plant's steel construction head tree, determine to there is intermittent sandwich, and be chosen as V level by JB/T4730-2005 standard, and the mechanical property determining the steel plate manufacturing this column meeting standard-required;
2, welded with the described supporting leg 3 of exclusive guideway on the inside and outside surface of described wing plate 1 containing intermittent sandwich defect, exclusive guideway exists in pairs on the inside and outside surface of the described wing plate 1 containing intermittent sandwich defect, and horizontal level is identical.Exclusive guideway quantity is set according to the size of intermittent sandwich defect area, then forms described grid 5 between exclusive guideway, and permanent numbering lattice 1, lattice 2 are carried out to each described grid 5
3, instrument parameter is adjusted: select described TOFD to pop one's head in 6; Start TOFD instrument, respectively described TOFD probe 6 is placed in containing in the exclusive guideway on the inside and outside surface of the described wing plate 1 of intermittent sandwich defect, thus make the described TOFD probe 6 being placed in one side send acoustic beam, and the described TOFD probe 6 being placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with intermittent sandwich defect length direction; Select the Φ 1mm through hole sensitivity with intermittent sandwich defective locations same depth; Other Selecting parameter default values;
4, the steel plate in described grid 5 carries out TOFD inspection, the highest wave amplitude of the defect in each described grid 5, length dimension is measured, and saves as picture format by number;
5, afterwards blowing out time, again TOFD inspection is carried out to the steel plate in grid described in this 5, by the assay of defect in the described grid 5 at each same position place and previous comparing, because the TOFD pair of defectoscopy precision parallel with its acoustic beam is high, monitoring Defect expanding ability can reach ± and 0.3 millimeter, therefore, when finding that the length of the intermittent sandwich defect in grid 5 described in this expands to some extent, the described wing plate 1 containing intermittent sandwich defect of tackling this column carries out sampling and carries out mechanical property test and whether meet request for utilization with checking or change this column.
Embodiment
To wing plate 1(wing plate thickness 50mm described in certain 350WM overcritical boiler of power plant steel construction head tree, material is Q345B) carry out the detection of general pulse reflection supersonic wave, determine that 25mm-28mm depths exists intermittent sandwich defect, be chosen as V level by JB/T4730-2005 standard; The reinspection data mechanical property test that consulting manufacturing plant provides meets standard-required, and meets steel construction stability and requirement of strength by calculating.
First time inspection, guide rail is welded in pairs as shown in Figure 5, because this steel plate defect area is comparatively large, so guide rail quantity is more on the inside and outside surface of wing plate described in head tree 1, form more described grid 5 between guide rail, each described grid 5 is numbered from 1-100.
Select TOFD probe 6; Start TOFD instrument, respectively described TOFD probe 6 is placed in containing in the exclusive guideway on the inside and outside surface of the described wing plate 1 of intermittent sandwich defect, thus make the described TOFD probe 6 being placed in one side send acoustic beam, and the described TOFD probe 6 being placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with the length direction of intermittent sandwich defect; Select the Φ 1mm through hole sensitivity with intermittent sandwich defective locations same depth; Other Selecting parameter default values.
TOFD inspection is carried out to the steel plate in the described grid 5 of numbering 1-100, the highest wave amplitude of the defect in each described grid 5, length dimension are measured, and save as picture format by number, the depth dimensions that TOFD instrument shows the i.e. length dimension of this intermittent sandwich defect.
Second time inspection is after this unit operation a period of time, same method is adopted to carry out TOFD inspection to the steel plate in the described grid 5 of numbering 1-100, equally the highest wave amplitude of the defect in each described grid 5, length dimension are measured, and save as picture format by number, the depth dimensions that TOFD instrument shows the i.e. length dimension of this intermittent sandwich defect.
Because the TOFD pair of defectoscopy precision parallel with its acoustic beam is high, monitoring Defect expanding ability can reach ± and 0.3 millimeter, the length direction of intermittent sandwich defect is parallel to the direction of TOFD acoustic beam by the present invention, therefore gets final product High Precision Monitor intermittent sandwich Defect expanding, that is the expansion of length direction.So by the twice TOFD inspection in front and back, contrast the change of the intermittent sandwich defect length size in the described grid 5 of identical numbering, the highest wave amplitude, if find that in second time inspection, length dimension expands, the highest wave amplitude improves, then can be judged as that intermittent sandwich defect has expansion trend.
Claims (1)
1. TOFD monitors a method for steel plate intermittent sandwich expansion, it is characterized in that: described method has been come by exclusive guideway, and described exclusive guideway comprises at least two to being symmetrically set in wing plate (1) both sides and perpendicular to the longitudinal rail of intermittent sandwich defect; Described longitudinal rail comprises stainless sheet steel (4) and supporting leg (3), two supporting legs (3) are vertically brazed in the two ends of described stainless sheet steel (4), at the wing plate (1) containing intermittent sandwich defect on the surface, adjacent longitudinal rail forms grid (5) in the other end soldering of described supporting leg (3);
Said method comprising the steps of:
1) by carrying out the detection of general pulse reflection supersonic wave to thermal power plant's steel construction head tree wing plate (1), determine to there is intermittent sandwich, and be chosen as V level by JB/T4730-2005 standard, and the mechanical property determining the steel plate manufacturing this column meeting standard-required;
2) welded with the supporting leg (3) of longitudinal rail on the inside and outside surface of described wing plate (1) containing intermittent sandwich defect, longitudinal rail exists in pairs on the inside and outside surface of described wing plate (1), and horizontal level is identical; Longitudinal rail quantity is set according to the size of intermittent sandwich defect area, then forms grid (5) between longitudinal rail, and permanent numbering lattice 1, lattice 2 are carried out to each described grid (5)
3) instrument parameter is adjusted: select TOFD probe (6); Start TOFD instrument, respectively described TOFD probe (6) is placed in containing in the longitudinal rail on the inside and outside surface of the described wing plate (1) of intermittent sandwich defect, thus make described TOFD probe (6) being placed in one side send acoustic beam, and described TOFD probe (6) being placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with intermittent sandwich defect length direction; Select the Φ 1mm through hole sensitivity with intermittent sandwich defective locations same depth; Other Selecting parameter default values;
4) steel plate in described grid (5) carries out TOFD inspection, the highest wave amplitude of the defect in each described grid (5), length dimension is measured, and saves as picture format by number;
5) afterwards blowing out time, again TOFD inspection is carried out to the steel plate in grid described in this (5), by the assay of described grid (5) the interior defect at each same position place and previous comparing, when finding that the length of the intermittent sandwich defect in grid (5) described in this expands to some extent, the described wing plate (1) containing intermittent sandwich defect of tackling this column carries out sampling and carries out mechanical property test and whether meet request for utilization with checking or change this column;
The pop one's head in height of (6) of the height sum of described stainless sheet steel (4) and described supporting leg (3) and described TOFD adapts; The length of described stainless sheet steel (4) adapts with the distance of described wing plate (1) the inside surface outer rim to web (2) place that contain intermittent sandwich defect; The pop one's head in length of (6) of the width of described grid (5) and described TOFD adapts.
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| CN104049034A (en) * | 2014-07-02 | 2014-09-17 | 国电科学技术研究院 | Method for estimating fatigue propagation life of intermittent sandwich steel plate |
| CN110687205A (en) * | 2019-10-18 | 2020-01-14 | 哈电集团（秦皇岛）重型装备有限公司 | Ultrasonic longitudinal wave reflection method and diffraction time difference method combined detection method and TOFD probe applied to method |
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| JPS63234157A (en) * | 1987-03-23 | 1988-09-29 | Nippon Steel Corp | Ultrasonic oblique flaw detecting method for thick steel tube |
| CN101504391B (en) * | 2009-03-11 | 2010-08-11 | 湖南省湘电锅炉压力容器检验中心有限公司 | Root defect detection method for thick-wall large-diameter pipe butt weld |
| CN101806777B (en) * | 2010-03-01 | 2011-09-21 | 哈尔滨工业大学 | Near surface flaw quantification detection method based on ultrasonic TOFD method |
| CN102507734A (en) * | 2011-10-26 | 2012-06-20 | 河北省电力建设调整试验所 | Ultrasonic time-of-flight diffraction (TOFD) detection method for weld seam |
| CN102706961B (en) * | 2012-07-02 | 2014-04-23 | 国电科学技术研究院 | Method for monitoring intermittent sandwich ultrasonic phased array of steel plate |
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