CN101699279A - Ultrasonic defect detection method for T-shaped joint fillet weld of dual-phase steel and carbon steel - Google Patents
Ultrasonic defect detection method for T-shaped joint fillet weld of dual-phase steel and carbon steel Download PDFInfo
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Abstract
The invention relates to an ultrasonic defect detection method for T-shaped joint fillet weld of dual-phase steel and carbon steel. The method comprises the following steps that: a test piece verified to be non-defective is cut off from a composite test standard piece block after section observation, a standard hole with a diameter of 3 millimeters is drilled in a weld of the test piece to make an artificial defect, a conventional probe is used to perform the ultrasonic defect detection and the waveform of each reflected wave is recorded; the test piece on which the standard hole with a diameter of 3 millimeters is drilled in the fifth step is subjected to the ultrasonic defect detection by a probe with low frequency and big wafer size and the waveform of each reflected wave is recorded; if the amplitude of a wave in the a step is obviously smaller than that in a former step, the wave is a pseudo-defect wave; and otherwise, the wave is a defect wave. The method has a great significance for the accurate recognition of pseudo-defects and the improvement on the rate of detectable defects and has a profound significance for the assurance of welding quality.
Description
Technical field
The present invention relates to boats and ships dual phase steel and carbon steel T connector fillet weld defect detection on ultrasonic basis.
Background technology
Fillet weld between the existing steel of the same race is checked welding effect with defect detection on ultrasonic basis, and ultrasound wave can directly be checked out weld defect, thereby judges the quality of welding.As the welding between the two phase stainless steel, the welding between carbon steel and the carbon steel etc.If but weld between the steel grade of two kinds of unlike materials, not necessarily just reacted with the detected flaw echo of UT (Ultrasonic Testing) and had defective in the weld seam, thereby can produce erroneous judgement.
As in two phase stainless steel and carbon steel fillet weld UT (Ultrasonic Testing), because of two phase stainless steel can produce boundary wave with the different of carbon steel material and acoustic impedance difference after the wave mode conversion, boundary wave can influence the evaluation of butt welded seam defective, influences the accuracy of UT (Ultrasonic Testing), causes unnecessary reprocessing.
At present, the domestic interference with regard to the boundary wave that occurs in boats and ships two phase stainless steel and the carbon steel fillet weld still do not have reliable solution.Therefore, research boats and ships dual phase steel and carbon steel T connector fillet weld defect detection on ultrasonic basis have crucial meaning.
Summary of the invention
The objective of the invention is to overcome the existing UT (Ultrasonic Testing) that adopts dissimilar steel T connector corner connection seam is easy to generate erroneous judgement, cause the unnecessary weak point of reprocessing, and a kind of dual phase steel and carbon steel T connector fillet weld defect detection on ultrasonic basis are provided.
The objective of the invention is to reach by following measure: dual phase steel and carbon steel T connector fillet weld defect detection on ultrasonic basis is characterized in that it comprises the steps:
1., operating personnel need have the UT II level operation certification that CCS approves, the supersonic reflectoscope of employing authorized by state;
2., make the compound test specimen mark piece of two phase stainless steel and carbon steel joint, press the making of CB/T3559-94 standard;
3., the 2. on the compound test specimen mark piece in the step, detect with supersonic reflectoscope, and write down each reflection wave waveform;
4., compound test specimen mark piece is carried out section observes checking defect situation, the existence of confirmation false defect ripple;
5., on the the compound test specimen mark piece after 4. going on foot section and observing, be partitioned into, in the test specimen weld seam, bore Φ 3mm gauge orifice and make artificial defect, get conventional transducer and carry out UT (Ultrasonic Testing) and detect, write down each reflection wave waveform through confirming a flawless test specimen;
6., get than the 5. the probe that the conventional transducer frequency is low, wafer size is big in the step to the 5. the test specimen of the brill Φ 3mm gauge orifice in the step carry out UT (Ultrasonic Testing) and detect, write down each reflection wave waveform;
7., the 5. 6. waveform in the step of step and the relatively, if the 6. the wave amplitude ratio in the step the 5. the wave amplitude in the step show tangible reduction, then this ripple is the false defect ripple; Otherwise then be defect waves.
Dual phase steel of the present invention and carbon steel T connector fillet weld defect detection on ultrasonic basis, the wave mode of eliminating the complex wave that occurs because of heterogeneous interface is changed the influence that UT (Ultrasonic Testing) is detected, the correct identification of false defect and the recall rate that improves defective there are significant impact, the assurance of welding quality is had far reaching significance.
Description of drawings
Fig. 1 is a reference block pattern of getting two phase stainless steel and carbon steel material making.
Fig. 2 a, Fig. 2 b are the reflected signal location drawing to two phase stainless steel and the detection of carbon steel joint welding.
Fig. 3 is the detection position graph of a relation to two phase stainless steel and carbon steel joint welding.
Fig. 4 penetrates the path synoptic diagram for the UT (Ultrasonic Testing) acoustic beam to two phase stainless steel and carbon steel joint welding.
Fig. 5 gets the reference block of workpiece material (two phase stainless steel and carbon steel) making and does the graph of a relation of artificial defective and detection position.
Fig. 6 detects the oscillogram of artificial defect for probe 1.
Fig. 7 detects the oscillogram of artificial defect for probe 2.
Embodiment
Describe performance of the present invention in detail below in conjunction with accompanying drawing, but they do not constitute the qualification to the present invention's protection, only do for example.Simultaneously by illustrating that advantage of the present invention will become clear more and understanding easily.
Dual phase steel of the present invention and carbon steel T connector fillet weld defect detection on ultrasonic basis is characterized in that it comprises the steps:
1., operating personnel need have the UT II level operation certification that CCS approves, the supersonic reflectoscope of employing authorized by state;
2., make the compound test specimen mark piece of two phase stainless steel and carbon steel joint, press the making of CB/T3559-94 standard;
3., the 2. on the compound test specimen mark piece in the step, detect with supersonic reflectoscope, and write down each reflection wave waveform;
4., compound test specimen mark piece is carried out section observes checking defect situation, the existence of confirmation false defect ripple;
5., on the the compound test specimen mark piece after 4. going on foot section and observing, be partitioned into, in the test specimen weld seam, bore Φ 3mm gauge orifice and make artificial defect, get conventional transducer and carry out UT (Ultrasonic Testing) and detect, write down each reflection wave waveform through confirming a flawless test specimen;
6., get than the 5. the probe that the conventional transducer frequency is low, wafer size is big in the step to the 5. the test specimen of the brill Φ 3mm gauge orifice in the step carry out UT (Ultrasonic Testing) and detect, write down each reflection wave waveform;
7., the 5. 6. waveform in the step of step and the relatively, if the 6. the wave amplitude ratio in the step the 5. the wave amplitude in the step show tangible reduction, then this ripple is the false defect ripple; Otherwise then be defect waves.
Below in conjunction with concrete accompanying drawing and experimentation performance of the present invention is described:
One. personnel prepare and equipment
Personnel: the UT II level operation certification that possesses the CCS approval.
Equipment: the CTS-22 type supersonic reflectoscope of State Metrological Bureau's calibrating;
1. frequency P=5MHZ K=2 wafer size 9mm*9mm pop one's head in;
2. frequency P=2MHZ K=2 wafer size 13mm*13mm pop one's head in;
Two. use test block
Carbon steel test block: reference block peculiar to vessel (RB-II);
The compound test specimen mark piece of two phase stainless steel and carbon steel joint: CB/T3559-94 standard;
Two phase stainless steel test block: reference block peculiar to vessel (CSK-I).
Three. experimentation
1. in the carbon steel test block, regulate supersonic reflectoscope at 1: 1 by the degree of depth.
Experiment: test Φ 3*10mm deep hole in carbon steel and two phase stainless steel test block respectively, the supersonic reflectoscope oscillography journey that holds one's breath and keep quiet differs endlessly (promptly more approaching to dual phase steel and the carbon steel velocity of sound), but about reference reflector wave height increase 10dB.
2. get two phase stainless steel and carbon steel material and make T type flaw detection test specimen (compound test specimen mark piece), see Fig. 1.
3. UT (Ultrasonic Testing) test.
In to two phase stainless steel and carbon steel fillet weld UT (Ultrasonic Testing), on the oscillography screen, find as Fig. 2 a, strong defect waves signal shown in Fig. 2 b, wave height is all being declared on the scrap wire; As Fig. 3, when popping one's head in, occur showing than the high-amplitude wave signal in the D point 20mm degree of depth in the A side shifting; Probe then strong " defect waves " signal occurs in the E point 18mm degree of depth and shows when the B side shifting; Probe does not have any wave mode and shows when the F side shifting; For this reflection wave, be easy to be rated as defective in incomplete fusion or the mother metal according to the judgement of routine, cause unnecessary reprocessing.This workpiece weld seam is carried out section observe, and do dye-penetrant inspection and detect, the zero defect vestige shows as a result.We infer, this may be because the wave mode of the complex wave that ultrasound wave occurs through heterogeneous interface is changed, and has produced interface echo.
So we are to hyperacoustic can not the property visited the querying of dissimilar steel T connector corner connection seam.As shown in Figure 4, when the process interface A of ultrasound wave path, because the acoustic impedance difference of carbon steel and austenitic stainless steel, interface acoustic pressure penetrance and reflectivity will influence UT (Ultrasonic Testing), again because interface material at opposite sides velocity of sound difference, complicated wave mode conversion will be occurred at the interface A place, non-defective wave mode as shown in Figure 2 may be on the oscillography screen, produced.We have carried out a large amount of groping and investigating to the complicacy of relevant boundary wave in the reality flaw detection, we select for use the different K values probe that workpiece is carried out ultrasonic scanning, in the hope of verifying whether there is defective in the weld seam, but still can't solve the influence that the boundary wave problem is brought by the size that changes incident angle.By analysis, we have proposed with the workpiece is reference block, changes the wafer size of probe and the flaw detection scheme of frequency probe, tries hard to reduce to the influence of boundary wave minimum.
4. scheme debugging
Through on-the-spot contrast, we adopt audaciously directly and are made into reference block (compound test specimen mark piece) as Fig. 1 from the workpiece sampling, for guaranteeing this test block welding quality, we have carried out the ultrasound examination of multiple angles of incidence degree to this test block, except the signal of boundary wave reflection, do not find other any flaw indication, prove that this test block welding quality is qualified.
To bore a Φ 3mm through hole G at the interface near B be artificial defect to dark 10mm below the b side in the test block fillet welding, as Fig. 5; Carry out the UT (Ultrasonic Testing) debugging.
Select probe 1 for use: frequency P=5MHZ K=2 wafer size 9mm*9mm, at test block a side shifting probe, find the high wave amplitude G of G Kongzui; Simultaneously, also occurred the boundary wave waveform D of continuous change on the oscillography screen, detected through UT (Ultrasonic Testing), oscillography screen waveform shows as Fig. 6.Boundary wave (wave amplitude D) oscillography screen display depth 11mm, G hole defect ripple (wave amplitude G) oscillography screen display depth 14mm, obviously, there is very big interference in the existence of boundary wave to defects assessment.If carry out defects assessment at this point, be easy to produce erroneous judgement.
Select probe 2 for use: frequency P=2MHZ K=2 wafer size 13mm*13mm, at test block a side shifting probe, find the high wave amplitude G of G Kongzui; Simultaneously, also occurred the very low boundary wave waveform D of wave amplitude of continuous change on the oscillography screen, detected through UT (Ultrasonic Testing), oscillography screen waveform shows as Fig. 7.Boundary wave (wave amplitude D) oscillography screen display depth 11mm because of wave amplitude is very low, can not consider to do defects assessment, G hole defect ripple (wave amplitude G) oscillography screen display depth 14mm, and obviously the existence of boundary wave has been not enough to influence the evaluation to defective.
In like manner, can be in the test block fillet welding dark 10mm below a side bore a Φ 3mm through hole at the interface near B and make artificial defect, carry out the UT (Ultrasonic Testing) debugging in the b side, test result as hereinbefore.
Experimental results show that, reduce frequency probe, increase the wafer size of probe, reduced behind the austenitic stainless steel that ultrasound wave enters into coarse-grain and the material decay that causes, can effectively reduce the accuracy that defective is differentiated in the actual flaw detection of heterogeneous steel boundary wave influence, be aided with the checking of self-control workpiece test block, the result will have more accuracy.
At present, the domestic interference with regard to the boundary wave that occurs in boats and ships two phase stainless steel and the carbon steel fillet weld still do not have reliable solution, because the complicacy of dissimilar steel T connector can be got workpiece material according to the method and be made the reference block that conforms to physical condition.When regulating, selects by instrument suitable probe for use according to this test block, make the UT (Ultrasonic Testing) path directly pass heterogeneous interface, promptly can reduce the error that causes because of the material face to greatest extent, basically can eliminate the influence of the wave mode conversion of the complexity that occurs because of heterogeneous interface again to UT (Ultrasonic Testing), if decay is serious, can suitably select low-frequency probe for use.
By above method, we are able to abundant application in practice, and the conclusion that facts have proved us is reliably, and is feasible, guaranteed the accuracy to two phase stainless steel and the ultrasound examination of carbon steel fillet weld, guaranteed the quality of product.
Claims (1)
1. dual phase steel and carbon steel T connector fillet weld defect detection on ultrasonic basis is characterized in that it comprises the steps:
1., operating personnel need have the UT II level operation certification that CCS approves, the supersonic reflectoscope of employing authorized by state;
2., make the compound test specimen mark piece of two phase stainless steel and carbon steel joint, press the making of CB/T3559-94 standard;
3., the 2. on the compound test specimen mark piece in the step, detect with supersonic reflectoscope, and write down each reflection wave waveform;
4., compound test specimen mark piece is carried out section observes checking defect situation, the existence of confirmation false defect ripple;
5., on the the compound test specimen mark piece after 4. going on foot section and observing, be partitioned into, in the test specimen weld seam, bore Φ 3mm gauge orifice and make artificial defect, get conventional transducer and carry out UT (Ultrasonic Testing) and detect, write down each reflection wave waveform through confirming a flawless test specimen;
6., get than the 5. the probe that the conventional transducer frequency is low, wafer size is big in the step to the 5. the test specimen of the brill Φ 3mm gauge orifice in the step carry out UT (Ultrasonic Testing) and detect, write down each reflection wave waveform;
7., the 5. 6. waveform in the step of step and the relatively, if the 6. the wave amplitude ratio in the step the 5. the wave amplitude in the step show tangible reduction, then this ripple is the false defect ripple; Otherwise then be defect waves.
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| CN2009102725279A CN101699279B (en) | 2009-10-27 | 2009-10-27 | Ultrasonic defect detection method for T-shaped joint fillet weld of dual-phase steel and carbon steel |
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Cited By (9)
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| CN102520067A (en) * | 2011-12-16 | 2012-06-27 | 北京工业大学 | Tube seat fillet welding seam detection method based on CIVA simulation software |
| CN102901777A (en) * | 2012-10-18 | 2013-01-30 | 镇江出入境检验检疫局检验检疫综合技术中心 | Manufacturing method of metal sheet manual damage based on aciding |
| CN102944610A (en) * | 2012-11-30 | 2013-02-27 | 湖南省湘电锅炉压力容器检验中心有限公司 | Method for detecting weld defect of stainless steel runner blade of water turbine |
| CN103983651A (en) * | 2014-05-23 | 2014-08-13 | 清华大学 | Pseudo-flaw elimination method for automatic X-ray detection on welding line based on possibility prediction |
| CN106840053A (en) * | 2017-03-14 | 2017-06-13 | 中车青岛四方机车车辆股份有限公司 | A kind of leg size of fillet weld and internal flaw ultrasonic non-destructive measuring method |
| CN108982661A (en) * | 2018-04-12 | 2018-12-11 | 杭州汽轮铸锻有限公司 | A kind of ultrasonic wave calculating assessment method of false defect |
| CN110632179A (en) * | 2019-10-31 | 2019-12-31 | 广船国际有限公司 | T-shaped joint weld quality judgment method |
| CN113484423A (en) * | 2021-06-22 | 2021-10-08 | 中铁山桥集团有限公司 | T-shaped welded joint TOFD detection reference block and detection method |
| CN114264726A (en) * | 2021-12-30 | 2022-04-01 | 武船重型工程股份有限公司 | Nondestructive testing method for full penetration weld of upset U rib |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2549607B1 (en) * | 1983-07-19 | 1986-01-31 | Gaz De France | METHOD FOR DETECTING DEFECTS, ESPECIALLY INTERNAL, SUCH AS CRACKS IN WELDED JOINTS |
| US6405596B1 (en) * | 2000-10-13 | 2002-06-18 | Chicago Bridge & Iron Company | Ultrasonic austenitic weld seam inspection method and apparatus |
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2009
- 2009-10-27 CN CN2009102725279A patent/CN101699279B/en not_active Expired - Fee Related
Cited By (13)
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| CN102520067A (en) * | 2011-12-16 | 2012-06-27 | 北京工业大学 | Tube seat fillet welding seam detection method based on CIVA simulation software |
| CN102520067B (en) * | 2011-12-16 | 2016-09-14 | 北京工业大学 | Nozzle weld detection method based on CIVA simulation software |
| CN102901777A (en) * | 2012-10-18 | 2013-01-30 | 镇江出入境检验检疫局检验检疫综合技术中心 | Manufacturing method of metal sheet manual damage based on aciding |
| CN102944610A (en) * | 2012-11-30 | 2013-02-27 | 湖南省湘电锅炉压力容器检验中心有限公司 | Method for detecting weld defect of stainless steel runner blade of water turbine |
| CN103983651A (en) * | 2014-05-23 | 2014-08-13 | 清华大学 | Pseudo-flaw elimination method for automatic X-ray detection on welding line based on possibility prediction |
| CN103983651B (en) * | 2014-05-23 | 2016-02-24 | 清华大学 | Weld seam X ray based on probabilistic forecasting detects false defect elimination method automatically |
| CN106840053A (en) * | 2017-03-14 | 2017-06-13 | 中车青岛四方机车车辆股份有限公司 | A kind of leg size of fillet weld and internal flaw ultrasonic non-destructive measuring method |
| CN106840053B (en) * | 2017-03-14 | 2020-01-10 | 中车青岛四方机车车辆股份有限公司 | Ultrasonic nondestructive measurement method for fillet weld leg size and internal defects |
| CN108982661A (en) * | 2018-04-12 | 2018-12-11 | 杭州汽轮铸锻有限公司 | A kind of ultrasonic wave calculating assessment method of false defect |
| CN110632179A (en) * | 2019-10-31 | 2019-12-31 | 广船国际有限公司 | T-shaped joint weld quality judgment method |
| CN113484423A (en) * | 2021-06-22 | 2021-10-08 | 中铁山桥集团有限公司 | T-shaped welded joint TOFD detection reference block and detection method |
| CN113484423B (en) * | 2021-06-22 | 2023-02-21 | 中铁山桥集团有限公司 | T-shaped welded joint TOFD detection reference block and detection method |
| CN114264726A (en) * | 2021-12-30 | 2022-04-01 | 武船重型工程股份有限公司 | Nondestructive testing method for full penetration weld of upset U rib |
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