CN101071126A - Micro projection welding spot quality non-destructive detecting method - Google Patents
Micro projection welding spot quality non-destructive detecting method Download PDFInfo
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- CN101071126A CN101071126A CN 200710072360 CN200710072360A CN101071126A CN 101071126 A CN101071126 A CN 101071126A CN 200710072360 CN200710072360 CN 200710072360 CN 200710072360 A CN200710072360 A CN 200710072360A CN 101071126 A CN101071126 A CN 101071126A
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Abstract
The invention provides a nondestructive testing method of micro convex welding solder joint quality and involves the detection method of solders joint quality. It aims at that there is no suitable nondestructive testing methods which can evaluate micro convex welding solder joint quality and feedback information in time, as well as the problem that convex welding and associated components can not solder joint quality detection on-line. The launch probe and receive probe are set in the sink, and the space between them is adjusted to more than focal length of launch probe. The direction of the two probes is adjusted to make receive signal amplitude highest. Then veneer plane is placed at the center line of two detectors vertically, and position is adjusted to receive the maximum signal amplitude. Adjusting the gain value, so that amplitude is 80% - screen high. The test pieces is used to replaced veneer so that solder joint is at the center lines of two probe; two probe scan the solder joint ,and the collected data is input to ultrasonic testing system, and automatically records waveform; a threshold value can be established to decide if penetrating signal amplitude is less than the threshold. The invention is high precision, high speed and low cost.
Description
Technical field
The present invention relates to a kind of detection method of quality of welding spot.
Background technology
Usually the welding method that adopts projection welding is because the very thin thickness of welded blank, generally about 1mm, even thinner, so that the characteristics of projection welding spot are spot sizes is little, and thin thickness, and because the cause of projection welding process characteristic, caves in the solder joint surface.
At present, the welding quality of projection welding spot detected check by performance test after still relying on artificial visually examine's inspection, destructive test and assembly forming product, especially to the quality of diameter, also there is not suitable Dynamic Non-Destruction Measurement at present at the following micro projection welding spot of 2mm.
For example to diameter be effective ultrasonic reflection technology during quality of welding spot about tens mm detects, particularly micro projection welding spot is powerless to little solder joint, this is because if adopt contact ultrasonic reflection method to detect, also do not have undersized contact ultrasonic probe like this to come out at present; If adopt manifold type ultrasonic reflection method to detect, because micro projection welding spot surface depression, reflected ultrasonic wave can present signal content complicated and changeable, be difficult to reflect the time of day of solder joint place welding quality, so conventional ultrasonic reflection technology can't detect micro projection welding spot.
Summary of the invention
The present invention is directed to present stage does not have suitable Dynamic Non-Destruction Measurement to estimate and to detect the untimely drawback of information feedback to micro projection welding spot quality, and projection welding spot and associated component can't onlinely carry out problems such as quality testing, and propose a kind of lossless detection method of micro projection welding spot quality.
Step of the present invention is as follows:
Step 1: transmitting probe 2 and receiving transducer 3 make the reception plane of the sound wave central shaft of transmitting probe 2 perpendicular to receiving transducer 3 as in the tank 1, and the spacing of two probes is greater than the focal length of transmitting probe, and this moment, the received signal wave amplitude reached the highest;
Step 2: no solder joint veneer plane that will be identical with test specimen material and thickness of slab is vertical to be positioned on the lines of centres of two probes under water, and is positioned at the focus of transmitting probe 2, makes the received signal wave amplitude reach the highest;
Step 3: adjust the yield value of ultrasonic testing system 5, making wave amplitude is that 80% screen is high;
Step 4: replace the no solder joint veneer identical with test specimen 4, solder joint is positioned on the line of centres of two probes with the test specimen material with micro projection welding spot;
Step 5: mobile simultaneously transmitting probe 2 and receiving transducer 3, this moment, ultrasound wave was by the solder joint center;
Step 6: 3 pairs of a plurality of solder joints of transmitting probe 2 and receiving transducer scan one by one, and receiving transducer 3 is gathered ultrasound data, enters data in the ultrasonic testing system 5, and ultrasonic testing system 5 writes down the signal waveform that penetrates of each solder joint automatically;
Step 7: according to concrete technological requirement signal amplitude is provided with a threshold value, when a certain solder joint of ultrasound wave process, judges that it penetrates signal amplitude and whether is lower than this threshold value, be lower than threshold value, the welding quality of this solder joint does not meet technological requirement.
Adopt this method not only to solve the problem that the micro projection welding spot welding quality is difficult to Non-Destructive Testing, and can also carry out fast detecting to a plurality of solder joints, Scanning speed is not less than 50mm/s, realization is to having the online quality testing of micro projection welding spot assembly, both can guarantee the welding quality of solder joint and structure, in time provide testing result, the rate of can reducing the number of rejects and seconds again reaches the purpose that reduces cost.And in testing process, when the line of centres of two probes departs from solder joint center when being not more than 0.8mm (is solder joint about 2mm for diameter), its accuracy of detection is unaffected.Fig. 2 is the oscillogram of detection system record, and the thickness of this test specimen welded blank is 0.6mm, contains 12 projection welding spots and a mounting hole on it, and spot size is about 2mm, and the mounting hole diameter is about 4mm.As can be seen from Figure 2, except that position 2,3, the wave amplitude of all the other 11 positions is all more than 0.6, and is promptly full frame more than 50%.7 places, position are the mounting hole of test specimen, and waveform is compared wideer with the waveform of other position.And through destructive detection validation, 2,3 of positions are two solder joints of failure welding, so it is very weak to detect wave amplitude, even are zero.As seen the amplitude Characteristics that penetrates signal according to solder joint place ultrasound wave can accurately be differentiated the quality of solder joint.
Description of drawings
Fig. 1 is a detection system structural representation of the present invention; Fig. 2 is the oscillogram of detection system record of the present invention.
Embodiment
Embodiment one: in conjunction with Fig. 1 present embodiment is described, the step of present embodiment is as follows:
Step 1: transmitting probe 2 and receiving transducer 3 make the reception plane of the sound wave central shaft of transmitting probe 2 perpendicular to receiving transducer 3 as in the tank 1, and the spacing of two probes is greater than the focal length of transmitting probe, and this moment, the received signal wave amplitude reached the highest;
Step 2: no solder joint veneer plane that will be identical with test specimen material and thickness of slab is vertical to be positioned on the lines of centres of two probes under water, and is positioned at the focus of transmitting probe 2, makes the received signal wave amplitude reach the highest;
Step 3: adjust the yield value of ultrasonic testing system 5, making wave amplitude is that 80% screen is high;
Step 4: replace the no solder joint veneer identical with test specimen 4, solder joint is positioned on the line of centres of two probes with the test specimen material with micro projection welding spot;
Step 5: mobile simultaneously transmitting probe 2 and receiving transducer 3, this moment, ultrasound wave was by the solder joint center;
Step 6: 3 pairs of a plurality of solder joints of transmitting probe 2 and receiving transducer scan one by one, and receiving transducer 3 is gathered ultrasound data, enters data in the ultrasonic testing system 5, and ultrasonic testing system 5 writes down the signal waveform that penetrates of each solder joint automatically;
Step 7: according to concrete technological requirement signal amplitude is provided with a threshold value, when a certain solder joint of ultrasound wave process, judges that it penetrates signal amplitude and whether is lower than this threshold value, be lower than threshold value, the welding quality of this solder joint does not meet technological requirement.
Transmitting probe 2 adopts water immersion focusing probe, and receiving transducer 3 adopts the water logging normal probe, and ultrasonic testing system 5 adopts the Ultrasonic C-Scan detection system.This method is propagated in material according to ultrasound wave can produce the principle of decay, adopts water coupling ultrasonic through transmission technique, uses immersion probe and Ultrasonic C-Scan detection system that the welding piece with micro projection welding spot is scanned, as shown in Figure 1.When ultrasound wave passed the intact solder joint of welding quality, its decay was main relevant with the material structure at solder joint place; And when solder joint place defectiveness be welding quality when bad, ultrasound wave can produce behaviors such as reflection, scattering, its attenuation degree obviously increases.The present invention is by after adjusting the location, penetrate signal reflected ultrasound wave pass the solder joint center with and attenuation during near zone, analysis penetrates the variation of signal amplitude, as Fig. 2, and to penetrating signal amplitude a threshold value is set according to concrete technological requirement, when a certain solder joint of ultrasound wave process, it penetrates signal amplitude and is lower than this threshold value, adopts the mode of record or warning to represent that the welding quality of this solder joint does not meet technological requirement.It is relevant with welding quality that ultrasound wave penetrates the amplitude height of signal in this method, and in welding quality the problem place being arranged is defective position, and the amplitude that ultrasound wave penetrates signal can reduce, and the degree of reduction is relevant with defect size.The production engineering specifications of concrete engineering can provide corresponding defective to allow to exist size according to the weld defects tolerance limit standard of International or National implementation, and this defective allows to exist the setting of size decision threshold.
Embodiment two: in conjunction with Fig. 1 present embodiment is described, present embodiment and embodiment one difference are to increase 5mm～10mm on the length of the focal length that transmitting probe in the step 1 and the spacing between the receiving transducer are transmitting probe.Other step, composition and connected mode are identical with embodiment one.
Claims (2)
1, the lossless detection method of micro projection welding spot quality is characterized in that its step is as follows:
Step 1: transmitting probe (2) and receiving transducer (3) make the reception plane of the sound wave central shaft of transmitting probe (2) perpendicular to receiving transducer (3), and the spacing of two probes are greater than the focal lengths of transmitting probe as in the tank (1);
Step 2: no solder joint veneer plane that will be identical with test specimen material and thickness of slab is vertical to be positioned on the lines of centres of two probes under water, and is positioned at the focus of transmitting probe (2);
Step 3: adjust the yield value of ultrasonic testing system (5), making wave amplitude is that 80% screen is high;
Step 4: replace the no solder joint veneer identical with test specimen (4), solder joint is positioned on the line of centres of two probes with the test specimen material with micro projection welding spot;
Step 5: mobile simultaneously transmitting probe (2) and receiving transducer (3), this moment, ultrasound wave was by the solder joint center;
Step 6: transmitting probe (2) and receiving transducer (3) scan one by one to a plurality of solder joints, receiving transducer (3) is gathered ultrasound data, enter data in the ultrasonic testing system (5), ultrasonic testing system (5) writes down the signal waveform that penetrates of each solder joint automatically;
Step 7: according to concrete technological requirement signal amplitude is provided with a threshold value, when a certain solder joint of ultrasound wave process, judges that it penetrates signal amplitude and whether is lower than this threshold value, be lower than threshold value, the welding quality of this solder joint does not meet technological requirement.
2, the lossless detection method of micro projection welding spot quality according to claim 1 is characterized in that increasing 5mm～10mm on the length of the focal length that transmitting probe in the step 1 and the spacing between the receiving transducer are transmitting probe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710072360 CN101071126A (en) | 2007-06-15 | 2007-06-15 | Micro projection welding spot quality non-destructive detecting method |
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| CN 200710072360 CN101071126A (en) | 2007-06-15 | 2007-06-15 | Micro projection welding spot quality non-destructive detecting method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354369B (en) * | 2008-09-12 | 2011-08-31 | 西安交通大学 | Electric arc stud welding waveform detection device |
| CN102426193A (en) * | 2011-11-11 | 2012-04-25 | 宁波江丰电子材料有限公司 | Method for detecting copper-phosphorus blank block and copper-phosphorus anode and method for manufacturing copper-phosphorus anode |
| CN102721745A (en) * | 2012-06-28 | 2012-10-10 | 吴江市宏达探伤器材有限公司 | Ultrasonic gas valve inspection equipment |
| WO2013159704A1 (en) * | 2012-04-27 | 2013-10-31 | 深圳深蓝精机有限公司 | Welding detection device and automatic welding machine |
| CN105181802A (en) * | 2015-10-09 | 2015-12-23 | 湖南湖大艾盛汽车技术开发有限公司 | Portable ultrasonic welding spot inspection equipment provided with one host and multiple slaves |
| CN106979981A (en) * | 2017-05-16 | 2017-07-25 | 吉林大学 | The circular multidirectional vector linear array revolution ultrasonic detection device of solder joint and method |
| CN107850577A (en) * | 2016-06-15 | 2018-03-27 | 株式会社东芝 | Structure evaluation system, structure evaluating apparatus and structure evaluation method |
| CN113655128A (en) * | 2021-07-30 | 2021-11-16 | 中国航空工业集团公司济南特种结构研究所 | Probe zero angle checking method of penetration method ultrasonic C scanning detection system |
-
2007
- 2007-06-15 CN CN 200710072360 patent/CN101071126A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354369B (en) * | 2008-09-12 | 2011-08-31 | 西安交通大学 | Electric arc stud welding waveform detection device |
| CN102426193A (en) * | 2011-11-11 | 2012-04-25 | 宁波江丰电子材料有限公司 | Method for detecting copper-phosphorus blank block and copper-phosphorus anode and method for manufacturing copper-phosphorus anode |
| WO2013159704A1 (en) * | 2012-04-27 | 2013-10-31 | 深圳深蓝精机有限公司 | Welding detection device and automatic welding machine |
| CN102721745A (en) * | 2012-06-28 | 2012-10-10 | 吴江市宏达探伤器材有限公司 | Ultrasonic gas valve inspection equipment |
| CN105181802A (en) * | 2015-10-09 | 2015-12-23 | 湖南湖大艾盛汽车技术开发有限公司 | Portable ultrasonic welding spot inspection equipment provided with one host and multiple slaves |
| CN107850577A (en) * | 2016-06-15 | 2018-03-27 | 株式会社东芝 | Structure evaluation system, structure evaluating apparatus and structure evaluation method |
| CN106979981A (en) * | 2017-05-16 | 2017-07-25 | 吉林大学 | The circular multidirectional vector linear array revolution ultrasonic detection device of solder joint and method |
| CN106979981B (en) * | 2017-05-16 | 2018-12-21 | 吉林大学 | Round solder joint cross linear array revolution ultrasonic detection device and method |
| CN113655128A (en) * | 2021-07-30 | 2021-11-16 | 中国航空工业集团公司济南特种结构研究所 | Probe zero angle checking method of penetration method ultrasonic C scanning detection system |
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