CN101811202A - Field welding residual stress test method for turbine runner - Google Patents
Field welding residual stress test method for turbine runner Download PDFInfo
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- CN101811202A CN101811202A CN 200910009184 CN200910009184A CN101811202A CN 101811202 A CN101811202 A CN 101811202A CN 200910009184 CN200910009184 CN 200910009184 CN 200910009184 A CN200910009184 A CN 200910009184A CN 101811202 A CN101811202 A CN 101811202A
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Abstract
The invention discloses a field welding residual stress test method for a turbine runner, which relates to the technical field of a welding residual stress test for the turbine runner, in particular to a systematic residual stress test method for a turbine runner which is processed and manufactured on field. For solving the technical problems existing in the determination of a weld-fusion line, the arrangement of a test point before and after annealing and the accurate drilling in a complicated surface in confined space by the runner in the existing residual stress test for the hydraulic turbine runner, the invention provides a systematic test scheme by an electrometric blind-hole method: the combination of non-destructive testing results and the measurement of a blade welding seam groove guarantees the weld-fusion line to be determined accurately; after annealing, the test point is translated by 15mm on a same blade, and the test point is arranged at the same position on another blade after annealing, thus realizing analysis and comparison before and after annealing; and four spherical leg drilling positioning devices of adjustable height are adopted to realize the accurate drilling in the complicated surface in the confined space.
Description
Technical field
Patent of the present invention is used for rotary wheel of water turbine residual stress test, and the systems approach of residual stress test is provided in particular for the rotary wheel of water turbine of processing and fabricating at the scene.
Background technology
The large-scale water turbine runner has mostly adopted blade, crown and ring single-piece work down, the manufacture method of site welding technology, and blade and crown and following ring connect by welding, have produced residual stress in processing and manufacturing.From the actual conditions of present China water power industry, welding residual stress is the major incentive of runner generation crackle.The problem of runner welding residual stress has caused the great attention of owner unit and relevant units such as design, manufacturing.But the method for a cover system is not used for the runner residual stress is tested and analyzed at present, particularly the rotary wheel of water turbine residual stress of processing and fabricating never has the method that is fit at the scene, and the on-the-spot residual stress test of rotary wheel of water turbine does not also have system to carry out in China.
The common method that is used for the residual stress test on the engineering is an electrical measurement blind hole method, but when application of electrical measurement blind hole method is carried out the residual stress test analysis to rotary wheel of water turbine, has three critical technical problems to need to solve: at first be determining of weld-fusion line.In runner manufacturing processing, blade and crown and the weld seam that encircles down need polishing, determine that by direct observation polishing back weld-fusion line will cause the deviation in the judgement.Next is the arrangement of measuring point before and after weld seam and the heat affected area annealing, adopt the blind hole measuring residual stress, can't measure once more in the position of having punched, to compare analysis to estimate the annealing effect to residual stress before and after the annealing so, need correct layout weld seam and the measuring point in the heat affected area thereof.At last, because blade and crown and following ring space, the tested position of junction are narrow and small, measured surface is complicated space curved surface, in some welding position that need test, the angle of blade and crown or following ring has the drilling tool operating difficulties of electrical measurement blind hole method now less than 90 °, be difficult to realize accurate boring, cause bigger test error, for the position of blade weld groove less than 50mm, the test of residual stress can't be carried out.
Summary of the invention
For solving the technical problem that the rotary wheel of water turbine residual stress exists, realize the rotary wheel of water turbine on-the-spot test, patent of the present invention provides electrical measurement blind hole method system testing scheme.This scheme comprises the position of accurate judgement polishing back weld-fusion line, before and after runner weld seam and the heat affected area annealing measuring point arrange and in the runner restricted clearance complex-curved on accurately boring.
Patent of the present invention solves the technical scheme that its technical problem adopts: by measuring the blade weld groove in conjunction with polishing back Non-Destructive Testing result, guarantee accurately to determine to greatest extent weld-fusion line.The method for arranging of runner weld seam and heat affected area measuring point is, arrange a measuring point along the weld-fusion line vertical direction every 15mm, annealing back on same blade with the inside translation 15mm of each measuring point, and select another blade to test, realize that the analysis before and after the annealing is compared at same position layout measuring point.Adopt four spherical leg drilling tools to be used magnifying glass and realize accurately boring in the complex-curved restricted clearance.
The implementation result that patent of the present invention is useful is to have realized the test of the on-the-spot residual stress of rotary wheel of water turbine.Blade has carried out the test and the research of system with the crown and the residual stress of following girth joint and heat affected area before and after using four runners of one group of hydraulic turbine annealing that patent of the present invention is 20mm-60mm to the blade weld groove, for the assay and the runner quality monitoring and the analysis during one's term of military service of processing technologys such as this runner welding, annealing provides first hand experimental data.Table 1 is welding residual stress test result before and after certain runner annealing of test.
Description of drawings
Fig. 1 is measuring point layout drawing before and after patent runner bucket weld seam of the present invention and the heat affected area annealing
1. crowns among Fig. 1, measuring point before 2. annealing, the limit that 3. intakes, 4. time ring 5. goes out the waterside, 6. blade, 7. measuring point, 8. weld-fusion line after the annealing.
Fig. 2 is patent blade rotating angle of the present invention place residual stress boring location
21. spherical legs among Fig. 2,22. nuts, 23. locking nuts, 24. drilling cramps, 25. drilling rods, 26. positioning sleeves, 27. locking glands, 28, adjust screw, 29. supports.
The specific embodiment
Turbine runner blade and crown and following boxing connect and form, and determine that accurately polishing back weld-fusion line is the first step of runner welding residual stress test.At first measure the size of tested regional blade weld groove, determine that by Non-Destructive Testing the polishing back is apart from 3-5 micro-crack position in the blade edge 100-200mm, and measure each point apart from crown or the following distance of encircling, if this distance equates with the distance of this position blade weld groove, be the point on the weld-fusion line, be connected with each other behind definite like this 3 points and just can determine position apart from blade edge 100-200mm inside weld melt run.
Determine that rationally point position could be analyzed the residual stress before and after the runner annealing, in order to estimate the effect of annealing.Point position determination method is to be benchmark with the weld-fusion line for this reason, along arranging measuring point with the weld-fusion line vertical direction.In conjunction with the accompanying drawings 1 specify as follows: go up to arrange a measuring point (2) in weld-fusion line (8), each moves 15mm and arranges a measuring point (2) respectively to both sides.Each measuring point of annealing back (7) on same blade inwardly translation 15mm as a comparison other, another blade of choosing same runner in addition with annealing before identical location arrangements measuring point as another comparison other.
Electrical measuring method is measured residual stress, need paste strain rosette at measured surface, discharging residual stress in the measured surface boring of pasting strain rosette measures simultaneously, require in the measurement in the center of strain rosette boring, otherwise can cause than mistake even test crash, and existing drilling equipment can not be finished big in curvature and blade that the locus is narrow and small and crown or down ring connection position accurately hole.In order in blade and crown and weld seam that encircles down and heat affected area, to realize accurately boring, the fixing device for drilling that adopts is four spherical adjustable feet formulas, in conjunction with the accompanying drawings 2 describe as follows: drilling cramp (24) places on the support (29), four spherical legs (21) are connected with support (29), and be fixed on the support (29) by nut (23) and locking nut (24), positioning sleeve (26) is installed in the drilling cramp (24), its position is adjusted by adjusting screw (28), by locking gland (27) locking positioning cover (26), drilling rod (25) places in the positioning sleeve (26) after the position is determined.Spherical leg (21) contacts for point with measured surface, and each spherical leg (21) can be regulated respectively apart from the height of measured surface, guaranteed to put the boring positioner flexibly in greater than each zone of 80 °, realized accurate location drilling, finished the release and the measurement of residual stress at the welding corner.
Claims (3)
1. complex-curved residual stress testing bore holes positioner in the rotary wheel of water turbine restricted clearance, it is characterized in that drilling cramp places on the support, four the spherical legs that can adjust respectively are connected with support, support is connected with drilling cramp, positioning sleeve places in the drilling cramp, adjustment screw, locking gland, locking positioning are placed on the drilling cramp, and drilling rod places in the positioning sleeve.
2. definite method of the on-the-spot welding residual stress weld-fusion line of rotary wheel of water turbine: be to determine that by Non-Destructive Testing the polishing back is apart from micro-crack position, blade edge 100-200mm weld zone, micro-crack and crown or down the distance of ring equal this position blade weld groove and be point on the weld-fusion line, determining like this to be connected with each other behind 3 points has just obtained weld-fusion line.
3. residual stress measuring point arrangement of features is to arrange a measuring point on weld-fusion line before and after the annealing, each moves 15mm and arranges a measuring point respectively to both sides, each measuring point of annealing back on same blade inwardly translation 15mm as a comparison other, another blade of choosing same runner in addition with annealing before identical location arrangements measuring point as another comparison other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910009184 CN101811202A (en) | 2009-02-23 | 2009-02-23 | Field welding residual stress test method for turbine runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910009184 CN101811202A (en) | 2009-02-23 | 2009-02-23 | Field welding residual stress test method for turbine runner |
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| Publication Number | Publication Date |
|---|---|
| CN101811202A true CN101811202A (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910009184 Pending CN101811202A (en) | 2009-02-23 | 2009-02-23 | Field welding residual stress test method for turbine runner |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778385A (en) * | 2012-07-11 | 2012-11-14 | 南京航空航天大学 | Welding residual stress measurement method |
| CN102853952A (en) * | 2012-09-18 | 2013-01-02 | 哈尔滨电机厂有限责任公司 | Method for testing welding residual stress of mixed-flow turning wheel |
| CN103353360A (en) * | 2012-11-14 | 2013-10-16 | 西安交通大学 | Method for measuring residual stress of welded rotor |
| CN104296894A (en) * | 2014-11-04 | 2015-01-21 | 苏州精创光学仪器有限公司 | Residual stress blind hole detection method for member |
| CN104439384A (en) * | 2014-11-04 | 2015-03-25 | 苏州精创光学仪器有限公司 | Drilling tool for detecting residual stress through blind hole method |
| CN104669448A (en) * | 2014-12-01 | 2015-06-03 | 广西大学 | Positioning and perforating machine for residual stress measurement |
| CN106370125A (en) * | 2016-10-27 | 2017-02-01 | 沈阳航空航天大学 | Blade continuous deformation measuring device based on residual stress release |
| CN107309737A (en) * | 2017-07-25 | 2017-11-03 | 芜湖市通达锅炉有限公司 | A kind of swing type sanding apparatus of pot vertical edges overlap |
-
2009
- 2009-02-23 CN CN 200910009184 patent/CN101811202A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778385A (en) * | 2012-07-11 | 2012-11-14 | 南京航空航天大学 | Welding residual stress measurement method |
| CN102853952A (en) * | 2012-09-18 | 2013-01-02 | 哈尔滨电机厂有限责任公司 | Method for testing welding residual stress of mixed-flow turning wheel |
| CN103353360A (en) * | 2012-11-14 | 2013-10-16 | 西安交通大学 | Method for measuring residual stress of welded rotor |
| CN103353360B (en) * | 2012-11-14 | 2015-07-01 | 西安交通大学 | Method for measuring residual stress of welded rotor |
| CN104296894A (en) * | 2014-11-04 | 2015-01-21 | 苏州精创光学仪器有限公司 | Residual stress blind hole detection method for member |
| CN104439384A (en) * | 2014-11-04 | 2015-03-25 | 苏州精创光学仪器有限公司 | Drilling tool for detecting residual stress through blind hole method |
| CN104669448A (en) * | 2014-12-01 | 2015-06-03 | 广西大学 | Positioning and perforating machine for residual stress measurement |
| CN106370125A (en) * | 2016-10-27 | 2017-02-01 | 沈阳航空航天大学 | Blade continuous deformation measuring device based on residual stress release |
| CN107309737A (en) * | 2017-07-25 | 2017-11-03 | 芜湖市通达锅炉有限公司 | A kind of swing type sanding apparatus of pot vertical edges overlap |
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Application publication date: 20100825 |