CN103529124A - Method for monitoring intermittent interlayer expansion of steel plate through TOFD - Google Patents
Method for monitoring intermittent interlayer expansion of steel plate through TOFD Download PDFInfo
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- CN103529124A CN103529124A CN201310463192.5A CN201310463192A CN103529124A CN 103529124 A CN103529124 A CN 103529124A CN 201310463192 A CN201310463192 A CN 201310463192A CN 103529124 A CN103529124 A CN 103529124A
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Abstract
The invention discloses a method for monitoring the intermittent interlayer expansion of a steel plate through TOFD. The method comprises the following steps: determining that the mechanical properties of a steel plate used for making a column satisfy requirements; welding the internal and external surfaces of a wing plate having intermittent interlayer defects to supporting legs of guide rails, setting the quantity of the guide rails according to the size of the area of the intermittent interlayer defects, permanently numbering small grids as grid 1, grid 2..., and adjusting apparatus parameters; examining the steel plate in each of the small grids, and measuring the highest amplitude and the length dimension of the intermittent interlayer defect of each of the small grids; and monitoring the steel plate in each of the small grids after furnace power-off, and comparing the examination result of the intermittent interlayer defect in each of the small grids with a previous examination result. The method monitors the expansion of the intermittent interlayer defects in the steel plate by utilizing a TOFD technology, and accurately compares the highest amplitude and the length dimension of a same defect in each time examination by means of the special guide rails, so the expansion of like defects can be effectively monitored.
Description
Technical field
The present invention relates to the method for the interrupted interlayer expansion of a kind of TOFD monitoring steel plate.
Background technology
Along with greatly developing of large capacity, 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 just larger.But domestic current standard has just been made and has been reviewed regulation the chemical composition of steel plate, mechanical test (stretching, crooked, impact), surface quality etc., 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 that does not have steel construction to use the ultrasonic testing of steel plate inherent vice.Therefore as long as the mechanical test of steel plate is qualified, can carry out the ultrasound wave of steel plate and review.
If head tree wing plate inside exists interrupted interlayer defect, (steel plate is thoroughly layering not, but press JB/T4730-2005 standard code, conventional pulse-echo ultrasound examination has reached V level, the poorest rank), these interrupted interlayers 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 the written quality assurance of power plant construction duration Duan, manufacture of steel structure factory, the head tree wing plate steel plate of a lot of power plant contains interrupted interlayer defect.Therefore adopt suitable method to carry out periodic monitoring to this type of interrupted interlayer defect, just become the important means of prevention Defect expanding.
At present, the detection method of steel plate inherent vice extensively adopts conventional pulse-echo ultrasound wave, but this type of defect has reached V level (the poorest level), and therefore conventional pulse-echo supercritical ultrasonics technology has been difficult to meet the requirement of monitoring Defect expanding.And TOFD technology is very responsive to little defect, especially to being parallel to can the reach ± 0.3mm of monitoring capability of the Defect expanding of its sound beam direction, be extremely applicable to the spread scenarios of the interrupted interlayer 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 TOFD method of inspection that can facilitate, accurately the inner interrupted interlayer defect spread scenarios of power plant boiler steel construction head tree steel plate be monitored.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the method for the interrupted interlayer expansion of a kind of TOFD monitoring steel plate, its gordian technique is: described monitoring method completes by exclusive guideway, and described exclusive guideway comprises that at least two pairs are symmetrically set in wing plate both sides and perpendicular to the longitudinal rail of interrupted interlayer 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 the other end soldering of described supporting leg is containing on the wing plate surface of interrupted interlayer defect, and adjacent longitudinal rail forms grid.
Said method comprising the steps of:
1), by thermal power plant's steel construction head tree wing plate is carried out to conventional pulse-echo ultrasound examination, determine to have interrupted interlayer, and be chosen as V level by JB/T4730-2005 standard, and the mechanical property that is identified for manufacturing the steel plate of this column meets standard-required;
2) by the inside and outside surface of described wing plate containing interrupted interlayer defect and the welding of the supporting leg of longitudinal rail, longitudinal rail exists in pairs on the inside and outside surface of described wing plate, and horizontal level is identical; According to the size of interrupted interlayer defect area, longitudinal rail quantity is set, between longitudinal rail, forms grid, and grid described in each is carried out to permanent numbering lattice 1, lattice 2
3) adjust instrument parameter: select TOFD probe; Start TOFD instrument, respectively described TOFD probe is placed in the inside and outside lip-deep longitudinal rail of the described wing plate that contains interrupted interlayer defect, thereby make the described TOFD probe that is placed in one side send acoustic beam, and the described TOFD probe that is placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with interrupted interlayer defect length direction; Select the Φ 1mm through hole sensitivity with interrupted interlayer defect position same depth; Other parameters are selected default value;
4) steel plate in described grid carries out TOFD check, the highest wave amplitude, the length dimension of the defect in grid described in each is measured, and saved as picture format by number;
5) afterwards during blowing out, again the steel plate in grid described in this is carried out to TOFD check, by the assay of defect in the described grid at each same position place and comparing last time, when the length of the interrupted interlayer defect in grid described in finding this expands to some extent, the described wing plate containing interrupted interlayer defect of tackling this column sample and carries out mechanical property test and whether meet request for utilization or change this column to verify.
The height of the height sum of described stainless sheet steel and described supporting leg and described TOFD probe adapts; The length of described stainless sheet steel is with containing the described wing plate inside surface outer rim of interrupted interlayer defect, the distance to web place adapts; The length of the width of described grid and described TOFD probe adapts.
The beneficial effect that adopts technique scheme to produce is: 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 interrupted interlayer defect of TOFD technical monitoring steel plate, the length direction of interrupted interlayer defect is parallel to TOFD sound beam direction, monitoring sensitivity and reliability have been guaranteed, and can be accurate by exclusive guideway, the highest wave amplitude in each check by same defect intuitively, length dimensions etc. contrast, can effectively 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 the inner interrupted interlayer defect diagrammatic cross-section of head tree wing plate;
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 at the schematic diagram containing on defect wing plate;
Fig. 6 is the B-B direction view of Fig. 5;
Fig. 7 is the interrupted interlayer defect expansion of TOFD technical monitoring 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 interrupted interlayer defect.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Referring to attached Fig. 1 and 2, the situation of the interrupted interlayer defect of wing plate 1 inside described in known power plant boiler steel construction head tree.
Referring to accompanying drawing 3-7, the exclusive guideway in the present invention comprises that at least two pairs are symmetrically set in wing plate 1 both sides and perpendicular to the longitudinal rail of interrupted interlayer defect; Longitudinal rail comprises stainless sheet steel 4 and supporting leg 3; Described supporting leg 3 is vertically brazed in behind the two ends of described stainless sheet steel 4, again by the direction perpendicular to defect trend, soldering is a pair of containing forming on the inside and outside surface of described wing plate 1 of interrupted interlayer defect respectively, and every a pair of horizontal level is identical, some to after disposed at equal distance, form described grid 5; Described stainless sheet steel 4 adapts with the height sum of described supporting leg 3 and the height of described TOFD probe 6; The length of described stainless sheet steel 4 is with containing the described wing plate 1 inside surface outer rim of interrupted interlayer defect, the distance to described web 2 places adapts.The length of the width of described grid 5 and described TOFD probe 6 adapts.
Monitoring step of the present invention is as follows:
1,, by wing plate 1 described in thermal power plant's steel construction head tree is carried out to conventional pulse-echo ultrasound examination, determine to have interrupted interlayer, and be chosen as V level by JB/T4730-2005 standard, and the mechanical property that is identified for manufacturing the steel plate of this column meets standard-required;
2, by the inside and outside surface of described wing plate 1 containing interrupted interlayer defect and 3 welding of the described supporting leg of exclusive guideway, exclusive guideway exists in pairs on the inside and outside surface of the described wing plate 1 containing interrupted interlayer defect, and horizontal level is identical.According to the size of interrupted interlayer defect area, exclusive guideway quantity is set, between exclusive guideway, forms described grid 5, and grid described in each 5 is carried out to permanent numbering lattice 1, lattice 2
3, adjust instrument parameter: select described TOFD probe 6; Start TOFD instrument, respectively described TOFD probe 6 is placed in the inside and outside lip-deep exclusive guideway of the described wing plate 1 that contains interrupted interlayer defect, thereby make the described TOFD probe 6 that is placed in one side send acoustic beam, and the described TOFD probe 6 that is placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with interrupted interlayer defect length direction; Select the Φ 1mm through hole sensitivity with interrupted interlayer defect position same depth; Other parameters are selected default value;
4, the steel plate in described grid 5 carries out TOFD check, the highest wave amplitude, the length dimension of the defect in grid described in each 5 is measured, and saved as picture format by number;
5, afterwards during blowing out, again the steel plate in grid described in this 5 is carried out to TOFD check, by the assay of described grid 5 interior defects at each same position place and comparing last time, 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 the length of the interrupted interlayer defect in grid 5 described in finding this expands to some extent, the described wing plate 1 containing interrupted interlayer defect of tackling this column samples and carries out mechanical property test and whether meet request for utilization or change this column to verify.
Embodiment
To wing plate 1(wing plate thickness 50mm described in the overcritical boiler of power plant steel construction of certain 350WM head tree, material is Q345B) carry out conventional pulse-echo ultrasound examination, determine that 25mm-28mm depths exists interrupted interlayer defect, is 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.
Check for the first time, on the inside and outside surface of wing plate described in head tree 1, weld in pairs as shown in Figure 5 guide rail, because this steel plate defect area is larger, so guide rail quantity is more, between guide rail, form more described grid 5, grid described in each 5 is numbered from 1-100.
Select TOFD probe 6; Start TOFD instrument, respectively described TOFD probe 6 is placed in the inside and outside lip-deep exclusive guideway of the described wing plate 1 that contains interrupted interlayer defect, thereby make the described TOFD probe 6 that is placed in one side send acoustic beam, and the described TOFD probe 6 that is placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with the length direction of interrupted interlayer defect; Select the Φ 1mm through hole sensitivity with interrupted interlayer defect position same depth; Other parameters are selected default value.
Steel plate in the described grid 5 of numbering 1-100 is carried out to TOFD check, the highest wave amplitude, the length dimension of the defect in grid described in each 5 are measured, and saving as by number picture format, the depth dimensions showing on TOFD instrument i.e. the length dimension of this interrupted interlayer defect.
Check is for the second time at this unit operation after a period of time, adopt same method to carry out TOFD check to the steel plate in the described grid 5 of numbering 1-100, equally the highest wave amplitude, the length dimension of the defect in grid described in each 5 are measured, and saving as by number picture format, the depth dimensions showing on TOFD instrument i.e. the length dimension of this interrupted interlayer 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 present invention is parallel to the length direction of interrupted interlayer defect the direction of TOFD acoustic beam, therefore can expand by the interrupted interlayer defect of High Precision Monitor, that is the expansion of length direction.So TOFD checks by twice of front and back, contrast interrupted interlayer defect length dimension, the variation of high wave amplitude in the described grid 5 of identical numbering, if find that in check for the second time, length dimension expands, the highest wave amplitude improves, and can be judged as interrupted interlayer defect has expansion trend.
Claims (2)
1. a method for the interrupted interlayer expansion of TOFD monitoring steel plate, is characterized in that: described method completes by exclusive guideway, and described exclusive guideway comprises that at least two pairs are symmetrically set in wing plate (1) both sides and perpendicular to the longitudinal rail of interrupted interlayer 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), the other end soldering of described supporting leg (3) is containing on wing plate (1) surface of interrupted interlayer defect, and adjacent longitudinal rail forms grid (5);
Said method comprising the steps of:
1), by thermal power plant's steel construction head tree wing plate (1) is carried out to conventional pulse-echo ultrasound examination, determine to have interrupted interlayer, and be chosen as V level by JB/T4730-2005 standard, and the mechanical property that is identified for manufacturing the steel plate of this column meets standard-required;
2) by the inside and outside surface of described wing plate (1) containing interrupted interlayer defect and the welding of the supporting leg (3) of longitudinal rail, longitudinal rail exists in pairs on the inside and outside surface of described wing plate (1), and horizontal level is identical; According to the size of interrupted interlayer defect area, longitudinal rail quantity is set, between longitudinal rail, forms grid (5), and grid described in each (5) is carried out to permanent numbering lattice 1, lattice 2
3) adjust instrument parameter: select TOFD probe (6); Start TOFD instrument, respectively described TOFD probe (6) is placed in the inside and outside lip-deep longitudinal rail of the described wing plate (1) that contains interrupted interlayer defect, thereby make the described TOFD probe (6) that is placed in one side send acoustic beam, and the described TOFD probe (6) that is placed in another side receives acoustic beam, to reach the TOFD acoustic beam state parallel with interrupted interlayer defect length direction; Select the Φ 1mm through hole sensitivity with interrupted interlayer defect position same depth; Other parameters are selected default value;
4) steel plate in described grid (5) carries out TOFD check, the highest wave amplitude, the length dimension of the defect in grid described in each (5) is measured, and saved as picture format by number;
5) afterwards during blowing out, again the steel plate in grid described in this (5) is carried out to TOFD check, by the assay of the interior defect of described grid (5) at each same position place and comparing last time, when the length of the interrupted interlayer defect in grid (5) described in finding this expands to some extent, the described wing plate (1) containing interrupted interlayer defect of tackling this column samples and carries out mechanical property test and whether meet request for utilization or change this column to verify.
2. the method for the interrupted interlayer expansion of a kind of TOFD monitoring steel plate according to claim 1, is characterized in that: described stainless sheet steel (4) adapts with the height sum of described supporting leg (3) and the height of described TOFD probe (6); The length of described stainless sheet steel (4) adapts with the distance of locating to web (2) containing described wing plate (1) the inside surface outer rim of interrupted interlayer defect; The length of the width of described grid (5) and described TOFD probe (6) adapts.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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