CN103901103A - Method for ultrasonically and quickly detecting position of welding seam - Google Patents
Method for ultrasonically and quickly detecting position of welding seam Download PDFInfo
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- CN103901103A CN103901103A CN201410129281.0A CN201410129281A CN103901103A CN 103901103 A CN103901103 A CN 103901103A CN 201410129281 A CN201410129281 A CN 201410129281A CN 103901103 A CN103901103 A CN 103901103A
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Abstract
The invention relates to a position detection method for a welding seam, and in particular relates to a method for ultrasonically and quickly detecting the position of the welding seam. The method comprises the following steps: (1) scanning base metal on a to-be-detected workpiece by using a high-frequency ultrasonic transverse wave probe of 10-20MHz; (2) adjusting the detection range of an ultrasonic flaw detector; (3) scanning the probe along a trajectory forming an included angle of 50-130 degrees with the base metal and the welding seam, wherein the position at which noise echo is obviously improved in the movement trajectory of the probe is the position of the welding seam. According to the method, in-service equipment can be quickly detected. The operation method is simple; the welding seam is subjected to accurate and reliable quantitative and positioning detection; when the probe is perpendicular to the welding seam to the greatest extent, the discovery efficiency of the welding seam is improved favorably.
Description
Technical field
The present invention relates to a kind of detection method of position while welding, be specifically related to a kind of method of ultrasound wave quick detection position while welding.
Background technology
On some equipment, weld seam can polish, but in the in-service detection of this kind equipment, requires the weld seam being polished to carry out the detection of corresponding proportion.As in boiler internal check, " boiler periodic inspection rule " requires drum weld seam to carry out a certain proportion of making a random inspection, but it is smooth that the weld seam of drum is all polished conventionally, only from being difficult in appearance to find weld seam to detect, the drawing disappearance of some drum, or drawing weld seam and field welding position are difficult to corresponding etc.
For this situation, propose a kind of solution and go for weld seam on drum, for weld seam detection is prepared.
Summary of the invention
The object of the present invention is to provide and a kind ofly utilize crystal boundary reflection echo, by the method for ultrasound examination quick detection position while welding, be particularly useful for the position sensing through polishing weld seam.
In order to realize foregoing invention object, the technical solution adopted in the present invention comprises:
The present invention includes following step:
Step 1: the high-frequency ultrasonic shear wave probe that uses 10 ~ 20MHz, the mother metal of the tested workpiece of scanning, adjust ultra-sonic defect detector, make the mother metal noise echo average signal of decay tested workpiece in the time of 50 ~ 80 decibels of the attenuator of instrument at ultra-sonic defect detector scale 10 ~ 20% all over the screen;
Step 2: adjust ultra-sonic defect detector sensing range, make one time, bottom surface of tested workpiece mother metal echo be presented at 70 ~ 90% of screen level scale;
Step 3: by probe along mother metal and with weld seam be 50 ~ 130 degree angles track scanning, when the crystal boundary average noise echoed signal of screen display obviously improves and exceedes scale all over the screen more than 30%, and continue to promote forward probe noise and fall after rise again when scale all over the screen is 20% below, in probe motion track, noise echo is obviously position while welding in the position of raising.
Further, high-frequency ultrasonic shear wave probe of the present invention is that arbitrary length of side is not more than the high-frequency ultrasonic shear wave K1 probe that the square wafer of 20mm or diameter are not more than the circular wafer of 20mm.
Further, ultra-sonic defect detector of the present invention is A type pulse reflection ultra-sonic defect detector.
Further, the angle of the probe described in step 3 of the present invention and weld seam is 90 ± 20 degree.
Technique effect of the present invention comprises: method of the present invention can realize the fast detecting to in-service equipment, and method of operating is simple, butt welded seam quantitatively, coordinate detection accurately and reliably, in the time that probe is vertical as far as possible with weld seam, be conducive to the efficiency of raising discovery weld seam.
Accompanying drawing explanation
The schematic diagram of employing method that Fig. 1 is embodiment 1.
In the accompanying drawings, 1 mother metal, 2 probes, 3 weld seams.
Embodiment
In order to increase the understanding of the present invention, the method for the ultrasound wave quick detection position while welding in conjunction with specific embodiments the present invention being proposed is described in further detail, and illustrated embodiment only, for explaining the present invention, does not form limiting the scope of the present invention.
Method of the present invention has been utilized crystal boundary reflection echo principle.In welding joint, the molten bath crystallisation by cooling that weld metal is formed by mother metal and weldering fusing forms.Weld metal in the time of crystallization, be semi-molten metal crystal boundary take the intersection of molten bath and base metals as nucleus, along being column crystal perpendicular to radiating surface direction back growth, finally these column crystals contact and stop growing at weld seam center.Because seam organization is as-cast structure, crystal boundary is thick.Therefore when ultrasonic scanning is to weld metal, crystal boundary reflection echo is strong compared with mother metal crystal boundary reflection echo, and especially for high frequency shear wave, wavelength is very short, even completely by crystal boundary scattering and without bottom surface noise echo.Utilize this principle, can realize by method of the present invention fast quantification, the detection and localization of butt welded seam.
The ultra-sonic defect detector that the present embodiment adopts is A type pulse reflection ultra-sonic defect detector, and producer and model are Chinese prestige HS616e.The probe that the present embodiment adopted is high-frequency ultrasonic shear wave K1 probe, and producer and model are: 10P13 × 13K1 that Shantou ultrasound instrument research institute produces.
As shown in Figure 1, the method for the present embodiment:
Step 1: the high-frequency ultrasonic shear wave K1 probe 2 that uses 10MHz, mother metal 1 on the tested workpiece of scanning, adjust ultra-sonic defect detector and make the pad value of attenuator of instrument at 73 decibels, the mother metal noise echo average height of tested workpiece is at ultra-sonic defect detector scale 20% all over the screen;
Step 2: adjust ultra-sonic defect detector sensing range, make one time, bottom surface of tested workpiece mother metal echo be presented at screen level scale 80%;
Step 3: by probe along being track (track shown in dotted line in the accompanying drawing 1) scanning of 90 degree angles with weld seam, when the crystal boundary average noise echoed signal of screen display obviously improves and exceedes scale all over the screen more than 30%, and continue to promote forward probe noise and fall after rise again when scale all over the screen is 20% below, in probe motion track, noise echo is obviously the position of weld seam 3 in the position of raising.
Claims (4)
1. a method for ultrasound wave quick detection position while welding, is characterized in that it comprises the steps:
Step 1: the high-frequency ultrasonic shear wave probe that uses 10 ~ 20MHz, the mother metal of the tested workpiece of scanning, adjust ultra-sonic defect detector, make the mother metal noise echo average signal of decay tested workpiece in the time of 50 ~ 80 decibels of the attenuator of instrument at ultra-sonic defect detector scale 10 ~ 20% all over the screen;
Step 2: adjust ultra-sonic defect detector sensing range, make one time, bottom surface of tested workpiece mother metal echo be presented at 70 ~ 90% of screen level scale;
Step 3: by probe along mother metal and with weld seam be 50 ~ 130 degree angles track scanning, when the crystal boundary average noise echoed signal of screen display obviously improves and exceedes scale all over the screen more than 30%, and continue to promote forward probe noise and fall after rise again when scale all over the screen is 20% below, in probe motion track, noise echo is obviously position while welding in the position of raising.
2. the method for ultrasound wave quick detection position while welding according to claim 1, is characterized in that described high-frequency ultrasonic shear wave probe is that arbitrary length of side is not more than the high-frequency ultrasonic shear wave K1 probe that the square wafer of 20mm or diameter are not more than the circular wafer of 20mm.
3. the method for ultrasound wave quick detection position while welding according to claim 2, is characterized in that described ultra-sonic defect detector is A type pulse reflection ultra-sonic defect detector.
4. the method for ultrasound wave quick detection position while welding according to claim 2, is characterized in that probe described in step 3 and the angle of weld seam are 90 ± 20 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410129281.0A CN103901103B (en) | 2014-04-02 | 2014-04-02 | A kind of method of ultrasound wave quick detection position while welding |
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| CN201410129281.0A CN103901103B (en) | 2014-04-02 | 2014-04-02 | A kind of method of ultrasound wave quick detection position while welding |
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| CN103901103A true CN103901103A (en) | 2014-07-02 |
| CN103901103B CN103901103B (en) | 2016-04-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052638A (en) * | 2017-05-23 | 2017-08-18 | 成都福莫斯智能系统集成服务有限公司 | A kind of multi-functional efficient electric arc welding system |
| CN111545983A (en) * | 2020-03-30 | 2020-08-18 | 江苏统联科技股份有限公司 | Automatic labeling mechanism for straight weld joint of short pipe of stainless steel welded pipe |
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| CN103439408A (en) * | 2013-08-20 | 2013-12-11 | 北京巴布科克·威尔科克斯有限公司 | Ultrasonic detection method for weld joint of small-caliber pipe shelf angle |
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| JPH02173511A (en) * | 1988-12-27 | 1990-07-05 | Mitsubishi Heavy Ind Ltd | Measuring method for joining width of electron beam welding |
| JP3772698B2 (en) * | 2001-06-19 | 2006-05-10 | 住友金属工業株式会社 | Method and apparatus for detecting weld defects in welded sections |
| CN101504391A (en) * | 2009-03-11 | 2009-08-12 | 湖南省湘电锅炉压力容器检验中心有限公司 | Root defect detection method for thick-wall large-diameter pipe butt weld |
| CN102721742A (en) * | 2012-06-21 | 2012-10-10 | 中铁宝桥（扬州）有限公司 | Ultrasonic flaw detection method of weld joint at U-shaped angle of rib of steel bridge plate unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052638A (en) * | 2017-05-23 | 2017-08-18 | 成都福莫斯智能系统集成服务有限公司 | A kind of multi-functional efficient electric arc welding system |
| CN111545983A (en) * | 2020-03-30 | 2020-08-18 | 江苏统联科技股份有限公司 | Automatic labeling mechanism for straight weld joint of short pipe of stainless steel welded pipe |
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| CN103901103B (en) | 2016-04-06 |
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Inventor after: Wang Qing Inventor after: Liu Changfu Inventor after: Wang Qiang Inventor after: Jing Shangqian Inventor after: Li Wenpeng Inventor after: Hou Shuanglin Inventor after: Wang Yan Inventor after: Rao Qun Inventor before: Liu Changfu Inventor before: Wang Qiang Inventor before: Jing Shangqian Inventor before: Li Wenpeng |
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