CN104181179A - Radiography method of pipe-pipe plate butt weld - Google Patents
Radiography method of pipe-pipe plate butt weld Download PDFInfo
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- CN104181179A CN104181179A CN201410361791.0A CN201410361791A CN104181179A CN 104181179 A CN104181179 A CN 104181179A CN 201410361791 A CN201410361791 A CN 201410361791A CN 104181179 A CN104181179 A CN 104181179A
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- pipe
- weld
- transillumination
- butt
- voussoir
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Abstract
The invention discloses a radiography method of a pipe-pipe plate butt weld. The method comprises the following steps of inserting a second wedge block with an X-ray film into a heat exchanging pipe corresponding to the tube-tube plate butt weld needing the transillumination, inserting a first wedge block with a micro radioactive source into an adjacent heat exchanging pipe, sequentially exposing the pipe-pipe plate butt weld by utilizing a transillumination method for illuminating an angular weld by transmitting two walls from the inside of two adjacent heat exchanging pipes, and achieving a transillumination purpose. By adopting the radiography method, the problem that the pipe-pipe plate butt weld on the inner side of a pipe plate cannot be subjected to the radiography can be solved. Moreover, the radiography method is simple to operate, low in cost and high in efficiency.
Description
Technical field
the present invention relates to technical field of nondestructive testing, particularly relate to a kind of radiographic method of pipe-pipe sheet butt-weld.
Background technology
the form of existing conventional pipe-pipe sheet butt-weld is: the only 1mm ~ 2mm of overlap joint size of heat exchanger tube and pore, and adopt automatic arc welding to go deep into butt welded seam in tubesheet holes and carry out melting, its joint form has three kinds, as shown in Figure 1.This pipe-pipe sheet butt-weld position is due to inner in tube bank, weld seam is around surrounded by housing and other heat exchanger tube completely, cannot be at pipe outside pieces of cloth, equally also cannot put radioactive source in pipe outside, therefore can not outside tube sheet, carry out transillumination by butt welded seam, can not adopt double-walled to beat the conventional pipe arrangement of mouth, its positional structure as shown in Figure 3.And conventional radiography specialized equipment, what adopt is transillumination technology backward, can only carry out radiography to the conventional fillet weld of pipe-pipe sheet (pipe head corner welding seam is in tube sheet outside), as shown in Figure 2, cannot carry out radiography to the pipe-pipe sheet butt-weld of tube sheet inner side.
Summary of the invention
the invention provides a kind of radiographic method of pipe-pipe sheet butt-weld, can solve cannot radiographic X problem in the pipe-pipe sheet butt-weld of tube sheet inner side.
in order to realize foregoing invention object, the invention provides following technical scheme:
a kind of radiographic method of pipe-pipe sheet butt-weld, the second voussoir that radiographic film is housed is inserted and needed in heat exchanger tube corresponding to the pipe-pipe sheet butt-weld of transillumination, and after the first voussoir that tiny radioactive source is housed is inserted in adjacent heat exchanger tube, from the inner transillumination method through double-walled illumination angle weld seam of adjacent heat exchange tubes, to pipe-pipe sheet, butt-weld exposes successively in employing, thereby reaches transillumination object.
when described heat exchanger tube is square arrangement, carry out exposure transillumination four times.
when described heat exchanger tube is equilateral triangle arrangement, carry out exposure transillumination six times.
described the second voussoir adopts high atomic number material to make.
described the first voussoir adopts low atomic number material to make.
advantage of the present invention is as follows:
1. can solve cannot radiographic X problem in the pipe-pipe sheet butt-weld of tube sheet inner side.
2. easy and simple to handle, cost economy, raises the efficiency.
Brief description of the drawings
fig. 1 a, 1b, 1c are the schematic diagram of three kinds of forms of pipe-pipe sheet butt-weld;
fig. 2 is the conventional fillet weld transillumination of existing pipe-pipe sheet principle schematic;
fig. 3 is the position view of the pipe-pipe sheet butt-weld described in the present invention in device;
fig. 4 is pipe-pipe sheet butt-weld transillumination principle schematic of the present invention;
fig. 5 be the present invention in the time that pore is square arrangement, transmiting time and transillumination source distribution schematic diagram;
fig. 6 is the present invention is equilateral triangle while arranging at pore, transmiting time and transillumination source distribution schematic diagram.
Embodiment
below in conjunction with accompanying drawing, the invention will be further described.
as shown in Figure 4, a kind of radiographic method of pipe-pipe sheet butt-weld, 1, radiographic film 4 is put into the shallow draw-in groove 5 of the second voussoir 1, be placed on the source of radiographic film by transillumination technology, horizontal level should be in the tube bank side of weld seam.The second voussoir 1 is goed deep into pore, and its draw-in groove 5 should be perpendicular to the plane of two tubes center line composition, and make radiographic film can be close to weld seam, do not stay gap as far as possible, fix radiographic film.Tiny radioactive source 2 first voussoirs 3 will be housed to be inserted in adjacent heat exchange tubes.
2, after above each step completes, and definite field staff's radioactive protection security compliance requirement, γ source conduit can be connected to the first voussoir 3, and be sent to sensitivity of film technique assigned address, according to the parameter of technique initialization, adopt double-walled transillumination method, link method and the linked set that can locate with reference to the γ source of working at ordinary times of linking of voussoir 1 (this γ source conduit with) exposes.
4, as shown in Figure 5,6, in the time that pore is square arrangement, butt welded seam carries out four exposures successively, and in the time that pore is equilateral triangle arrangement, butt welded seam carries out six exposures successively, to reach the object of 100% exposure.
in Fig. 4, label 6 is tube sheet, and label 7 is housing, and label 8 is the pipe-pipe sheet butt-weld of tube sheet inner side, and label 9 is heat exchanger tube, and label 10 is directions of rays.
in the time carrying out radiography, note following some:
for reducing geometric unsharpness, must adopt special micro-focus radioactive source, typical Source size is φ 0.5x1.0mm.
radiographic film need to carry out adaptation processing according to ips, and vacuum packaging.
image quality indicator adopts isometrical image quality indicator, and model, according to heat exchanger tube thickness, is selected with reference to JB/T4730 standard, and the length direction of image quality indicator silk should move towards perpendicular with weld seam.Image quality indicator is that the image quality indicator image on radiographic film can be used as a kind of permanent evidence, shows that radiograph test carries out under proper condition for the instrument of inspection and the quantitative evaluation radiographic film quality of image.
focus, the selection of the distance between the weld seam that needs to make film should consider to reduce projection distortion factor, takes into account photographic sensitivity factor simultaneously.
adopt low atomic number material (as: aluminium, rubber, plastics) to make the first voussoir 13 and can reduce the loss of ray energy, adopt as lead waits high atomic number material (as: lead, copper, tungsten) and make the second voussoir 1, can prevent backward scattering, and be convenient to the location of radiographic source and film, can be quantitative to going out geometric position accurately.
while formulating radiography technique, should carry out process qualification.Test is carried out in special tube to tube-sheet welds photographic sensitivity qualification test block, and in test block, artificial defect is a series of apertures, and process qualification should be able to detect φ 0.5mm aperture in test block.
Claims (5)
1. the radiographic method of a pipe-pipe sheet butt-weld, it is characterized in that: the second voussoir (1) that radiographic film (4) will be housed inserts to be needed in heat exchanger tube corresponding to the pipe-pipe sheet butt-weld of transillumination, and after the first voussoir (3) that tiny radioactive source (2) will be housed inserts in adjacent heat exchanger tube, from the inner transillumination method through double-walled illumination angle weld seam of adjacent heat exchange tubes, to pipe-pipe sheet, butt-weld exposes successively in employing, thereby reaches transillumination object.
2. the radiographic method of a kind of pipe-pipe sheet butt-weld according to claim 1, is characterized in that: when described heat exchanger tube is square arrangement, carry out exposure transillumination four times.
3. the radiographic method of a kind of pipe-pipe sheet butt-weld according to claim 1, is characterized in that: when described heat exchanger tube is equilateral triangle arrangement, carry out exposure transillumination six times.
4. the radiographic method of a kind of pipe-pipe sheet butt-weld according to claim 1, is characterized in that: described the second voussoir (1) adopts high atomic number material to make.
5. the radiographic method of a kind of pipe-pipe sheet butt-weld according to claim 1, is characterized in that: described the first voussoir (3) adopts low atomic number material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410361791.0A CN104181179A (en) | 2014-07-28 | 2014-07-28 | Radiography method of pipe-pipe plate butt weld |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410361791.0A CN104181179A (en) | 2014-07-28 | 2014-07-28 | Radiography method of pipe-pipe plate butt weld |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104181179A true CN104181179A (en) | 2014-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410361791.0A Pending CN104181179A (en) | 2014-07-28 | 2014-07-28 | Radiography method of pipe-pipe plate butt weld |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690524A (en) * | 2015-02-15 | 2015-06-10 | 四川蓝星机械有限公司 | Process for machining heat exchange device of heat exchanger |
| CN105486703A (en) * | 2015-12-17 | 2016-04-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Double X-ray negative film radiographing method |
| CN107064189A (en) * | 2016-11-07 | 2017-08-18 | 国家电网公司 | Distribution dry-type transformer winding material real time imagery lossless detection method and device |
| CN110618147A (en) * | 2019-10-25 | 2019-12-27 | 东方电气集团东方锅炉股份有限公司 | System and method for measuring height of incomplete penetration defect of tube-tube plate fillet weld |
| CN110987983A (en) * | 2019-12-20 | 2020-04-10 | 哈电集团（秦皇岛）重型装备有限公司 | Radiographic inspection process for weld joint of heat exchange tube and tube plate and sensitivity sample thereof |
Citations (4)
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| US4567012A (en) * | 1982-07-12 | 1986-01-28 | Combustion Engineering, Inc. | Dual isotope method to radiograph structures in nuclear steam supply systems |
| CN101135656A (en) * | 2007-09-20 | 2008-03-05 | 中国特种设备检测研究院 | Pipe-pipe sheet weld joint gamma-ray digital image-forming automatic detection system |
| CN201740746U (en) * | 2009-10-22 | 2011-02-09 | 中国第一重型机械股份公司 | Tube-tube sheet weld radiographic inspection auxiliary tool of heat exchanger |
| CN202614697U (en) * | 2012-05-29 | 2012-12-19 | 张家港化工机械股份有限公司 | Shooting detecting tool for heat exchange tube and tube plate deep-hole welding |
-
2014
- 2014-07-28 CN CN201410361791.0A patent/CN104181179A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4567012A (en) * | 1982-07-12 | 1986-01-28 | Combustion Engineering, Inc. | Dual isotope method to radiograph structures in nuclear steam supply systems |
| CN101135656A (en) * | 2007-09-20 | 2008-03-05 | 中国特种设备检测研究院 | Pipe-pipe sheet weld joint gamma-ray digital image-forming automatic detection system |
| CN201740746U (en) * | 2009-10-22 | 2011-02-09 | 中国第一重型机械股份公司 | Tube-tube sheet weld radiographic inspection auxiliary tool of heat exchanger |
| CN202614697U (en) * | 2012-05-29 | 2012-12-19 | 张家港化工机械股份有限公司 | Shooting detecting tool for heat exchange tube and tube plate deep-hole welding |
Non-Patent Citations (1)
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| 强天鹏等: "管子-管板焊缝的射线照相无损检测技术", 《化工设备与管道》, vol. 45, no. 6, 31 December 2008 (2008-12-31) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690524A (en) * | 2015-02-15 | 2015-06-10 | 四川蓝星机械有限公司 | Process for machining heat exchange device of heat exchanger |
| CN104690524B (en) * | 2015-02-15 | 2017-09-26 | 四川蓝星机械有限公司 | A kind of processing technology of heat-exchanger rig for heat exchanger |
| CN105486703A (en) * | 2015-12-17 | 2016-04-13 | 南车戚墅堰机车车辆工艺研究所有限公司 | Double X-ray negative film radiographing method |
| CN107064189A (en) * | 2016-11-07 | 2017-08-18 | 国家电网公司 | Distribution dry-type transformer winding material real time imagery lossless detection method and device |
| CN110618147A (en) * | 2019-10-25 | 2019-12-27 | 东方电气集团东方锅炉股份有限公司 | System and method for measuring height of incomplete penetration defect of tube-tube plate fillet weld |
| CN110987983A (en) * | 2019-12-20 | 2020-04-10 | 哈电集团（秦皇岛）重型装备有限公司 | Radiographic inspection process for weld joint of heat exchange tube and tube plate and sensitivity sample thereof |
| CN110987983B (en) * | 2019-12-20 | 2023-02-28 | 哈电集团（秦皇岛）重型装备有限公司 | Radiographic inspection process for weld joint of heat exchange tube and tube plate and sensitivity sample thereof |
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Application publication date: 20141203 |
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