CN103630606A - Ultrasonic layer-detection method for bi-metal metallurgical composite boiler pipe - Google Patents
Ultrasonic layer-detection method for bi-metal metallurgical composite boiler pipe Download PDFInfo
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- CN103630606A CN103630606A CN201310649674.XA CN201310649674A CN103630606A CN 103630606 A CN103630606 A CN 103630606A CN 201310649674 A CN201310649674 A CN 201310649674A CN 103630606 A CN103630606 A CN 103630606A
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Abstract
The invention discloses an ultrasonic layer-detection method for a bi-metal metallurgical composite boiler pipe, and belongs to the technical field of composite pipe layer-detection. The ultrasonic layer-detection method comprises the following steps: (1), manufacturing a sample pipe: carving a flat-bottom hole a and a flat-bottom hole b at different positions of a sample pipe with the length of 4 m, wherein the flat-bottom hole a is d1 in length, and is positioned on a combination layer, the flat-bottom hole b is d2 in length, the d2 is not less than 1/4 t and not larger than 2/1 t, the t is the wall thickness of the sample pipe, the diameter of each flat-bottom hole is 3.2-6 mm, and the tolerance is +10%; (2), debugging equipment: moving a probe to be aligned with the flat-bottom hole b, finding the highest back wave of a manual flaw of the flat-bottom hole b, restraining the highest back wave of the flat-bottom hole b by the forwards moving end of a gate, and restraining a secondary back wave of the flat-bottom hole a by the other end of the gate; (3), performing ultrasonic detection on produced pipes; (4), performing hand-detecting verification on unqualified produced pipes. According to the invention, the layered back wave gate position of ultrasonic detection is changed, so that the interference to back waves is effectively eliminated, the possibility of false alarm caused by fluctuation of an initial wave of a single gate is reduced, the hand-detecting workload and the consumption of spare parts are reduced, and the precision and working efficiency of the judgment on the bi-metal metallurgical composite boiler pipe are greatly improved.
Description
Technical field
The present invention relates to complex pipe layering detection technique field.
Background technology
Monometallic or thermometal are seamless steel pipe, especially oil well pipe, boiler tube etc., pipe work inclement condition, inside and outside wall all bears and corrodes and pressure, and quality requirements is high, and quality control does not allow to exist lamination defect.
In order to guarantee product export qualification rate, generally adopt ultrasound wave to carry out Non-Destructive Testing.The skin of complex pipe is basic unit, thinner, and along with the rotation of pipe, beginning ripple (water steel boundary wave) exists undulatory property, layering echo can be covered or layering echo is caused to interference, thereby affect the judgement of actual lamination defect, has disturbed the judgement to pipe.
American Standard API SEPC 5LD: binding layer connecting line receives the C level of criterion referenced ASTM A578 and checks and accepts, parent metal detects carries out the examination of API 5L E8 chapter, be not less than the B2 level of ISO10124 standard, GB/T20490 revises and adopts ISO10124, and for example personnel's qualification requirement is taked national standard requirement; YB/T6623 is by translation method adopting by equation API SEPC 5LD.API SEPC 5LD and YB/T6623 are mainly bimetal tube standards, have comprised layering testing requirement, and ISO10124 and GB/T20490, for weldless steel tube, do not emphasize that bimetal tube layering detects.
Although above-mentioned standard detects and claims bimetal tube layering, Dan Weidui pipe basic unit and binding layer are treated with a certain discrimination, in testing process, run into binding layer near inwall or two kinds of situations of outer wall, all by 1/2-1/4 wall thickness, detect, for connecting line place, can not make overall plans, especially centrifugal blank+extruding composite bimetal pipe examination criteria is lacked to specific aim method, actual testing process runs into the problem that single flat-bottom hole detects wrong report.For guaranteeing UT (Ultrasonic Testing) result accuracy, initial stage employing machine is visited defensive position and is visited the multiple checking of visiting, and because there being wrong report, to hand spy work, brings very large workload.
Summary of the invention
The invention provides a kind of bimetal metallurgy compound pot boiler tube ultrasound wave layer detection method, by changing ultrasound examination layering echo position of strobe, effectively eliminate interference echo impact, having reduced homostrobe beginning ripple shakes into the wrong report causing, reduce hand and visit workload and spare parts consumption, greatly improved accuracy rate and work efficiency that bimetal metallurgy compound pot boiler tube is judged.
The technical solution used in the present invention is:
A bimetal metallurgy compound pot boiler tube ultrasound wave layer detection method, comprises the steps:
(1) make sample pipe: the diverse location at the long sample pipe of 4m is carved flat-bottom hole a and flat-bottom hole b, and the degree of depth of flat-bottom hole a is d
1, be positioned at binding layer; The flat-bottom hole b degree of depth is d
2; 1/4t≤d wherein
2≤ 1/2t, t is wall thickness; Flat-bottom hole diameter is 3.2-6mm, tolerance+10%;
(2) commissioning device: mobile probe, aim at flat-bottom hole b position, find the highest echo of people's industrial injury of flat-bottom hole b, gate reach one end frame is lived the highest echo of flat-bottom hole b, gate other end frame is lived the second trip echo of flat-bottom hole a, avoids boundary wave when detection of dynamic, " to scurry into " in gate and causes reporting by mistake.Should note making to greatest extent gate width to cover total wall thickness;
(3) product pipe is carried out to ultrasound examination;
(4) underproof product pipe is carried out to hand and visit checking.
Preferably, in step (2), using the highest ripple 50% as reference sensitivity, increase 3dB as detection sensitivity.
After ultrasound wave layering detects, for underproof product pipe, need to carry out hand and visit checking, further to confirm the area, size etc. of defect.The defect that automatic detection system detects, according to ASTM A578 C grade standard, check and accept, scope is no more than the circle of 25.4mm, on same defect face, the wall thickness thickness simultaneously detecting can not be less than groundwork thickness+1mm(and determine according to the minimum thickness that allows of alloy layer thickness), to guarantee that the thickness of corrosion resisting alloy layer is not less than regulation requirement.
Bimetal metallurgy composite boiler tubular construction of the present invention: outer layer thickness 1.5-3.0mm, outer layer alloys internal layer carbon steel, metallurgical binding mode.
The beneficial effect that adopts technique scheme to produce is:
The present invention is by changing ultrasound examination layering echo position of strobe, effectively eliminate interference echo impact, reduce homostrobe beginning ripple and shaken into the wrong report causing, reduced hand and visit workload and spare parts consumption, greatly improved accuracy rate and work efficiency that bimetal metallurgy compound pot boiler tube is judged.
Embodiment
Embodiment 1
In the present embodiment, the specification of bimetal metallurgy compound pot boiler tube is: φ 89 * (2+7), 225 bimetal metallurgy compound pot boiler tubes are detected, testing result is as table 1.
(1) make sample pipe: the diverse location at the long sample pipe of 4m is carved flat-bottom hole a and flat-bottom hole b, and the degree of depth of flat-bottom hole a is d
1, be positioned at binding layer; The flat-bottom hole b degree of depth is d
2; D wherein
2for 1/4t, t is wall thickness; Flat-bottom hole diameter is 6mm, tolerance+10%;
(2) commissioning device: mobile probe, aim at flat-bottom hole b position, find the highest echo of people's industrial injury of flat-bottom hole b, gate reach one end frame is lived the highest echo of flat-bottom hole b, and gate other end frame is lived the second trip echo of flat-bottom hole a;
(3) product pipe is carried out to ultrasound examination;
(4) underproof product pipe is carried out to hand and visit checking.
Embodiment 2
In the present embodiment, the specification of bimetal metallurgy compound pot boiler tube is: φ 108 * (3+10), 125 bimetal metallurgy compound pot boiler tubes are detected, testing result is as table 1.
(1) make sample pipe: at the sample pipe that 4m is long, carve flat-bottom hole a and flat-bottom hole b, the degree of depth of flat-bottom hole a is d
1, be positioned at binding layer; The flat-bottom hole b degree of depth is d
2; D wherein
2for 1/2t, t is wall thickness; Flat-bottom hole diameter is 3.2mm, tolerance+10%.
(2) commissioning device: debugging ultrasonic equipment, find end ripple, gate reach one end frame lives in flat-bottom hole b; Gate other end frame lives in flat-bottom hole a, obtains defect waves;
(3) sample hose is carried out to ultrasound examination;
(4) underproof product pipe is carried out to hand and visit checking.
Embodiment 3
In the present embodiment, the specification of bimetal metallurgy compound pot boiler tube is: φ 60.3 * (1.65+4.88), 160 bimetal metallurgy compound pot boiler tubes are detected, testing result is as table 1.
(1) make sample pipe: at the sample pipe that 4m is long, carve flat-bottom hole a and flat-bottom hole b, the degree of depth of flat-bottom hole a is d
1, be positioned at binding layer; The flat-bottom hole b degree of depth is d
2; D wherein
2for 1/3t, t is wall thickness; Flat-bottom hole diameter is 4mm, tolerance+10%.
(2) commissioning device: debugging ultrasonic equipment, find end ripple, gate reach one end frame lives in flat-bottom hole b; Gate other end frame lives in flat-bottom hole a, obtains defect waves;
(3) sample hose is carried out to ultrasound examination;
(4) underproof product pipe is carried out to hand and visit checking.
Adopt conventional method and method of the present invention to detect sample hose, and machine is visited to unacceptable product and carry out hand and visit checking, result is as table 1:
Table 1 Data Comparison
As shown in Table 1, method of the present invention has greatly reduced the wrong report that machine is visited, and reduces the workload that hand is visited checking, can improve the accuracy rate that bimetal metallurgy compound pot boiler tube is judged.
Claims (2)
1. a bimetal metallurgy compound pot boiler tube ultrasound wave layer detection method, is characterized in that comprising the steps:
(1) make sample pipe: the diverse location at the long sample pipe of 4m is carved flat-bottom hole a and flat-bottom hole b, and the degree of depth of flat-bottom hole a is d
1, be positioned at binding layer; The flat-bottom hole b degree of depth is d
2; 1/4t≤d wherein
2≤ 1/2t, t is wall thickness; Flat-bottom hole diameter is 3.2-6mm, tolerance+10%;
(2) commissioning device: mobile probe, aim at flat-bottom hole b position, find the highest echo of people's industrial injury of flat-bottom hole b, gate reach one end frame is lived the highest echo of flat-bottom hole b, and gate other end frame is lived the second trip echo of flat-bottom hole a;
(3) product pipe is carried out to ultrasound examination;
(4) underproof product pipe is carried out to hand and visit checking.
2. bimetal metallurgy compound pot boiler tube ultrasound wave layer detection method according to claim 1, is characterized in that usining the highest ripple 50% as reference sensitivity in step (2), increases 3dB as detection sensitivity.
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| CN201310649674.XA CN103630606A (en) | 2013-12-06 | 2013-12-06 | Ultrasonic layer-detection method for bi-metal metallurgical composite boiler pipe |
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| CN201310649674.XA CN103630606A (en) | 2013-12-06 | 2013-12-06 | Ultrasonic layer-detection method for bi-metal metallurgical composite boiler pipe |
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| CN103630606A true CN103630606A (en) | 2014-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913746A (en) * | 2015-06-05 | 2015-09-16 | 邯郸新兴特种管材有限公司 | Measuring method of metallurgically-bonded thermometal composite pipe wall thickness |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57211061A (en) * | 1981-06-22 | 1982-12-24 | Hitachi Ltd | Electron scan type ultrasonic flaw detector |
| CN101206195A (en) * | 2006-12-21 | 2008-06-25 | 上海宝钢工业检测公司 | Method for testing burial depth of approximate surface layer defect by ultrasound wave |
| JP2012242160A (en) * | 2011-05-17 | 2012-12-10 | Jfe Steel Corp | Ultrasonic flaw detection method of welded steel pipe |
-
2013
- 2013-12-06 CN CN201310649674.XA patent/CN103630606A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57211061A (en) * | 1981-06-22 | 1982-12-24 | Hitachi Ltd | Electron scan type ultrasonic flaw detector |
| CN101206195A (en) * | 2006-12-21 | 2008-06-25 | 上海宝钢工业检测公司 | Method for testing burial depth of approximate surface layer defect by ultrasound wave |
| JP2012242160A (en) * | 2011-05-17 | 2012-12-10 | Jfe Steel Corp | Ultrasonic flaw detection method of welded steel pipe |
Non-Patent Citations (2)
| Title |
|---|
| 中华人民共和国国家质量监督检疫总局 等: "承压无缝和焊接（埋弧焊除外）钢管分层欠缺的超声检测", 《中华人民共和国国家标准 GB/T 20490-2006》, 12 September 2006 (2006-09-12) * |
| 赵仁顺 等: "超声检测钢管管体分层缺陷方法的研究与应用", 《检测技术》, vol. 41, no. 6, 31 December 2012 (2012-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913746A (en) * | 2015-06-05 | 2015-09-16 | 邯郸新兴特种管材有限公司 | Measuring method of metallurgically-bonded thermometal composite pipe wall thickness |
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Application publication date: 20140312 |