CN104237011B - Pipe girth weld test sample creep testing device - Google Patents
Pipe girth weld test sample creep testing device Download PDFInfo
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- CN104237011B CN104237011B CN201410452059.4A CN201410452059A CN104237011B CN 104237011 B CN104237011 B CN 104237011B CN 201410452059 A CN201410452059 A CN 201410452059A CN 104237011 B CN104237011 B CN 104237011B
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Abstract
The invention discloses a novel pipe girth weld test sample creep testing device. The novel pipe girth weld test sample creep testing device comprises two groups of clamping head components with the same structure, and each clamping head component comprises a pulling rod and a clamping mouth part, a threaded connecting shaft is arranged at one end of each pulling rod, and an axial blind hole and a radial pin hole A are formed in the other end of each pulling rod; each clamping mouth part comprises a clamping mouth plate A and a clamping mouth plate B with the same shape, the whole outer outline of each of the clamping mouth plates A and the clamping mouth plates B is partially in the shape of a cylinder, each clamping mouth plate A and the corresponding clamping mouth plate B are engaged, semi-circular bosses are arranged on the opposite surfaces at the front ends of each clamping mouth plate A and the corresponding clamping mouth plate B, the back ends of the clamping mouth plates A and the clamping mouth plates B are embedded in the blind holes of the pulling rods, pin holes B which are just opposite to the pin holes A are formed in the clamping mouth plates A and the clamping mouth plates B, and the clamping mouth plates A and the clamping mouth plates B are connected with the pulling rods by pins. The device disclosed by the invention is matched with an existing high-temperature creep testing machine, and can be used for testing creep performance of an actual girth weld joint of a heat-resistant alloy pipe on the premise of not transforming existing equipment, thereby expanding the range of application of a traditional testing machine.
Description
Technical field
The invention belongs to material mechanical performance field tests, specifically, are related to a kind of weld-end fittings creep rupture test
Experimental rig.
Background technology
Coal fired power generation is China's topmost generation mode at present, and for energy-saving and emission-reduction, China is greatly developing efficiently
Clean extra-supercritical unit.There are water screen tube, reheater tube, superheater tube, the province of substantial amounts in thermal power unit boiler
The high-temperature alloy pipes such as coal device pipe, are connected using welding procedure.Because the vapor (steam) temperature and pressure of extra-supercritical unit are improved,
So that the Service Environment of boiler high-temperature alloy pipe becomes extremely severe, therefore a large amount of new heat-resisting alloys are used, such as
T23, T92, HR3C etc..However, the long term high temperature performance of country's heat-resisting alloy new to these grasps not enough (particularly most weak
Welding point), once there is multiple welding joint and revealed accident in unit, such as domestic multiple stage unit there occurs large-area T23 water
Cold wall pipe is revealed, and causes unit non-programmed halt, brings huge economic loss.
Statistics shows, the principal mode of heat-resisting alloy pipe failure is crackle, and crackle 6 points of tube welding joint is originated from more
It is transversal crack at the root of weld of clock and 12 o'clock position, from inwall along wall thickness direction and pipeline axial direction to external expansion, part
Crackle has extended to mother metal.In order to study the mechanism that the transversal crack occurs, the creep Cracking Mechanism of welding point should be studied.So
And, the creep test method in current standard is and axially sampled along pipe, and axial tension causes occur longitudinal crack in weld seam,
The load-up condition of transversal crack generation cannot be simulated, the research of transversal crack mechanism of production is constrained.Therefore, for heat-resisting alloy
Pipe welding point is developed a kind of new creep test device and is had great importance.
The content of the invention
Present invention aim to overcome that existing traditional uniaxial static creep test can only along the axially loaded deficiency of pipe, and to pipe
Sub- radial direction imposed load, and the root reinforcement by designing annular groove-shaped structure to accommodate at pipe girth joint root of weld, exploitation
A kind of compact conformation is simple, easy to use and flexible, and fills with the annular solder sample creep test of existing testing machine no-float
Put, for heat-resisting alloy pipe girth welded joint, using this device the actual loading situation of simulation pipe can be closer to.
A kind of pipe ring button creep test device of the present invention, including two groups of structure identical chuck components, it is described
Chuck component includes pull bar and jaws part, and one end of the pull bar is thread cnnecting shaft, and the other end of the pull bar is provided with axle
To blind hole and radial direction pin-and-hole A；The jaws part is made up of two shape identical jaws plate A and jaws plate B, jaws plate
The overall outline of A and jaws plate B is part cylindrical, and jaws plate A and jaws plate B is in obvolvent arrangement, jaws plate A and jaws
Plate B be located on the relative surface in front end be respectively provided with semicircle boss, jaws plate A and jaws plate B rear end be inlaid in it is described
In the blind hole of pull bar, jaws plate A and jaws plate B is provided with the pin-and-hole B aligned with pin-and-hole location A, jaws plate A and jaws plate B with
Pin connection is adopted between pull bar.
Further, pipe ring button creep test device of the present invention, it is characterised in that two groups of structure identical folders
The thread cnnecting shaft on two pull bars in head assembly is coaxially arranged.
Semicircle boss on jaws plate A and jaws plate B forms chuck, and the chuck is used to clamping and fixing welded tube sample.
Compared with prior art, the invention has the beneficial effects as follows：
The high temperature welded tube annular creep test device of the present invention, coordinates, without the need for existing with existing high-temerature creep testing machine
The croop property to the actual girth welded joint of heat-resisting alloy pipe is capable of achieving on the premise of having scrap build to test, expand traditional examination
Test the scope of application of machine.
Description of the drawings
Fig. 1 is the stereogram of pipe ring button creep test device of the present invention；
Fig. 2 is the main view partial sectional view of experimental rig shown in Fig. 1；
Fig. 3 is the partial sectional view of pull bar shown in Fig. 2；
Fig. 4-1 is the front view of jaws plate shown in Fig. 2 14；
Fig. 4-2 is the top view of jaws plate shown in Fig. 4-1 14.
In figure：10th, 20- jaws component, 11,21- pull bars, 12,22- pins, 13,23- jaws plate A, 14,24- jaws plates
B, 15- semicircle boss, 16- blind holes, 17- pin-and-hole A, 18- pin-and-hole B.
Specific embodiment
Below in conjunction with the accompanying drawings technical solution of the present invention is described in further detail with specific embodiment.
As depicted in figs. 1 and 2, a kind of pipe ring button creep test device of the invention, including two groups of structures is identical
Chuck component 10 and 20, illustrate that it is constituted by taking chuck component 10 as an example, the chuck component 10 includes pull bar 11 and mouth part
Part, one end of the pull bar 11 is thread cnnecting shaft, is coupled to the high temperature pull bar with high-temerature creep testing machine；The pull bar 11
The other end be provided with the pin-and-hole A17 of axial blind hole 16 and radial direction, the jaws part is by two shape identical jaws plate A13
Constitute with jaws plate B14, the overall outline of each jaws plate is part cylindrical, and two jaws plates are arranged in obvolvent, two
The relative surface of jaws front edge of board is respectively provided with semicircle boss 15, and jaws plate A13 and jaws plate B14 are provided with pin-and-hole B18, folder
After oralia A13 and jaws plate B14 obvolvents, its rear end is inlaid in the blind hole 16 of pull bar 11, pin-and-hole B18 and pin-and-hole A17 positions pair
Just, connected using pin 12 between jaws plate A13 and jaws plate B14 and pull bar 11.
Equally, chuck component 20 is made up of pull bar 21, pin 22, jaws plate A23, jaws plate B24.
The thread cnnecting shaft on two pull bars in two groups of structure identical chuck components for coaxially arranged, as shown in Figure 2.
(i.e. side is jaws plate A13 and jaws to two jaws parts in two groups of structure identical chuck components 10 and 20
Plate B14, opposite side is jaws plate A23 and jaws plate B24) after obvolvent, after the front end in contact of two chuck components 10 and 20, in folder
Oral area position forms the chuck of a cylindrical shape, because each jaws front edge of board is provided with semicircle boss 15, therefore, by two semicircles
The outer surface of the chuck that boss 15 is formed is the cylinder surface of revolution, and the chuck is used to clamping and fixing welded tube sample.
In order to reduce device volume, save test and taken up space, the present invention presss from both sides two in two chuck components 10,20
Mouth 13,14 and 23,24 sinks in the blind hole of pull bar 11,21, as shown in Figures 2 and 3.
When installing sample, first, by the semicircle boss in jaws A13 of chuck component 10 and the jaws of chuck component 20
Clamp mouth part semicircle boss on 23 forms the position formation round boss that obvolvent is aligned, and then welded tube sample is enclosed within into the boss
On, in the same manner, by the clamp mouth part in jaws B24 of the semicircle boss in jaws B14 of chuck component 10 and chuck component 20 half
Round boss forms the position formation round boss that obvolvent is aligned, and chuck component 10,20 is inserted respectively afterwards pull bar 11 and 21
In, and respectively by the connection of pin 12 and 22.
Using pipe ring button creep test device of the present invention, first, the pull bar 11 in a chuck component 10
Thread cnnecting shaft is linked and maintains static with testing machine bottom, screw thread and the test of the pull bar 21 in another chuck component 20
Machine stretching end is linked and applies weighing apparatus and carries, and ensures that the position of external force is Weld pipe mill (as passed through in Fig. 2 by sample center
The dot-dash line position of two axial directions of pull bar 11 and 21), while whole device and folded sample are placed in high-temperature burner hearth.Carry out single shaft
During creep tension test, power is transferred to being made up of jaws plate A13 and jaws plate B14 in chuck through pull bar 11 and pin 12
Jaws part；In the same manner, the pull bar 21 and pin 22 that counter-force is also passed through in another chuck component 20 is transferred to clamp part (by two
Individual jaws plate is constituted).
When high-temerature creep test (500 DEG C) are carried out after this device clamping sample, sample girth joint is born along pipe radial direction
Tensile load, can accordingly simulate the structure constraint stress that heat-resisting alloy pipe girth joint bears, the germinating of observation root crack and extension
Behavior, so as to analyze the property of transversal crack.
The present invention intends simulating heat-resisting alloy pipe welding point military service bar by developing a kind of annular creep test device
Part (high temperature, load, root of weld defect etc.), studies the mechanism that transversal crack and extension occur at root of weld, is to propose that corrective measure is carried
For theoretical with data foundation, safe and stable, reliability and economical operation after going into operation to ultra-supercritical boiler etc. are with important meaning
Justice and practical value.
Although above in conjunction with accompanying drawing, invention has been described, the invention is not limited in above-mentioned being embodied as
Mode, above-mentioned specific embodiment is only schematic, rather than restricted, and one of ordinary skill in the art is at this
Under the enlightenment of invention, without deviating from the spirit of the invention, many variations can also be made, these belong to the present invention's
Within protection.
Claims (3)
1. a kind of pipe ring button creep test device, including two groups of structure identical chuck components, it is characterised in that
The chuck component includes pull bar and jaws part, and one end of the pull bar is thread cnnecting shaft, the pull bar it is another
End is provided with the pin-and-hole A of axial blind hole and radial direction；The jaws part is by two shape identical jaws plate A and jaws plate B structures
Into the overall outline of jaws plate A and jaws plate B is part cylindrical, and jaws plate A and jaws plate B is arranged in obvolvent, jaws
The rear end that plate A and jaws plate B is respectively provided with semicircle boss, jaws plate A and jaws plate B on the relative surface in front end is embedding
In being mounted in the blind hole of the pull bar, jaws plate A and jaws plate B are provided with the pin-and-hole B aligned with pin-and-hole location A, jaws plate A and folder
Pin connection is adopted between oralia B and pull bar.
2. pipe ring button creep test device according to claim 1, it is characterised in that two groups of structure identicals folders
The thread cnnecting shaft on two pull bars in head assembly is coaxially arranged.
3. pipe ring button creep test device according to claim 1 or claim 2, it is characterised in that jaws plate A and jaws
Semicircle boss on plate B forms chuck, and the chuck is used to clamping and fixing welded tube sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410452059.4A CN104237011B (en) | 2014-09-05 | 2014-09-05 | Pipe girth weld test sample creep testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410452059.4A CN104237011B (en) | 2014-09-05 | 2014-09-05 | Pipe girth weld test sample creep testing device |
Publications (2)
| Publication Number | Publication Date |
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| CN104237011A CN104237011A (en) | 2014-12-24 |
| CN104237011B true CN104237011B (en) | 2017-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410452059.4A Active CN104237011B (en) | 2014-09-05 | 2014-09-05 | Pipe girth weld test sample creep testing device |
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| CN (1) | CN104237011B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136575A (en) * | 2015-09-07 | 2015-12-09 | 江苏大学 | Welding-type superhard blade mechanical property test device and method |
| CN106442117A (en) * | 2016-09-13 | 2017-02-22 | 华能国际电力股份有限公司 | Clamping device for bar-shaped sample creep endurance test |
| CN106769429A (en) * | 2017-01-20 | 2017-05-31 | 东北大学 | The improved method that a kind of thermal expansion phase transformation instrument drawing by high temperature sample has thermograde |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2987985B2 (en) * | 1991-03-27 | 1999-12-06 | 株式会社島津製作所 | Pipe gripper |
| JP3247738B2 (en) * | 1992-11-06 | 2002-01-21 | 日本原子力研究所 | Fatigue specimen gripper |
| CN2767993Y (en) * | 2004-12-28 | 2006-03-29 | 西北有色金属研究院 | Clamp for testing high temperature tensile property of thin-walled pipe |
| CN201681020U (en) * | 2010-05-14 | 2010-12-22 | 苏州热工研究院有限公司 | Fixture for toroidal tensile test of thin pipe |
| CN201885933U (en) * | 2010-11-11 | 2011-06-29 | 中国西电电气股份有限公司 | Tensioning ring tensile testing tooling |
| CN102323140B (en) * | 2011-08-11 | 2014-08-20 | 西北工业大学 | Sample and clamp for thin walled tube high temperature tensile test |
| CN102445384B (en) * | 2011-09-22 | 2013-10-16 | 西北工业大学 | Clamp for testing annular tensile property of tubular product |
| CN202693413U (en) * | 2012-07-06 | 2013-01-23 | 中国核动力研究设计院 | Small-sized tube toroidal stretching fixture |
| CN203011765U (en) * | 2012-10-24 | 2013-06-19 | 中华人民共和国上海出入境检验检疫局 | Special clamping device matched with pipe ring stretching test |
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Address after: 300350 District, Jinnan District, Tianjin Haihe Education Park, 135 beautiful road, Beiyang campus of Tianjin University Patentee after: Tianjin University Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |