CN102520067B - Nozzle weld detection method based on CIVA simulation software - Google Patents

Nozzle weld detection method based on CIVA simulation software Download PDF

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CN102520067B
CN102520067B CN201110425173.4A CN201110425173A CN102520067B CN 102520067 B CN102520067 B CN 102520067B CN 201110425173 A CN201110425173 A CN 201110425173A CN 102520067 B CN102520067 B CN 102520067B
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detection
sensor
ultrasonic
computer
software
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CN102520067A (en
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焦敬品
侯松
刘伟
何存富
吴斌
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The present invention is a kind of Nozzle weld defect supersonic detection method based on CIVA software, belongs to field of non destructive testing.The present invention utilizes numerical simulation module to carry out numerical simulation, obtains sensor detection position amplitude curve, and weld defect can examine regional graphics;Detection angles and the detection position of sound production sensor of sensor is selected according to this simulation result;Ultrasonic signal excitation/receiver module produces pumping signal under control of the computer, go out ultrasonic signal by sensor excitation to launch along detection test specimen, and the ultrasonic signal reflected is received by sensor, it is transferred to computer through ultrasonic exciting/receiver module the most again;Detection waveform can be obtained by the acquisition software in computer, calculate the position that i.e. can determine that weld defect finally by sound path.The present invention can be greatly improved defects detection efficiency and the reliability of defects detection of Nozzle weld.

Description

Nozzle weld detection method based on CIVA simulation software
Technical field
The present invention relates to a kind of Nozzle weld defect inspection method based on sound field simulation software, the method master Nozzle weld class formation to be used for, belongs to field of non destructive testing.
Background technology
Fillet weld of tube seat on header is the rigid structure connecting bank of tubes with header, and its structural stress is concentrated mainly on fillet welding Seam root.This angle welding rate of cooling in welding process is fast, lack of penetration, incomplete fusion, crackle etc. easily occurs Defect, and its Service Environment is generally accompanied with the bigger temperature difference, easily causes crackle and the expansion of non-integration region Exhibition.Showing the analysis result of some thermal power plant's welding seam leakage at angle points in recent years, major part leakage is due to angle welding The defect risks such as lack of penetration, incomplete fusion, the crackle that are formed in the fabrication process are in operation what extension caused, Therefore the inspection to angle welding internal flaw is most important.
Ultrasonic examination is higher to the hazardness area-type flaw detection sensitivity such as lack of penetration, incomplete fusion, crackle, The method is the main development direction of angle welding internal flaw inspection.But due to Nozzle weld complex-shaped, Structure is special, and weld seam cross section everywhere all differs, and with angle probe when diverse location is to this kind of seam inspection, Position and rule that defect waves occurs also differ.It is generally required to this kind of weld seam is surpassed by the testing staff of specialty Sonic flaw detection, otherwise easily judges by accident or missing inspection major defect.Therefore the effect of the detection to Nozzle weld defect is improved The reliability of rate and defects detection thereof is particularly important.
For overcoming common angle probe detection efficiency low, the shortcomings such as loss is high, it is possible to use multiple array elements composition changes Phased array Non-Destructive Testing can be carried out by device array.Phased array ultrasonic detection technology controls transducer array by electronic system Each array element in row, launches according to certain rule time delay and receives ultrasound wave, it is achieved sector scanning, sound Bundle focuses on.Therefore, phased array detects has advantage quick, accurate, adaptable, and the detection of defect Rate is high.But phased delay emission circuit is extremely complex, synchronization and delay requirement to launching signal are the highest, and Along with the increase of array element number, complexity and the cost of control battle array circuit production all dramatically increase, and therefore, it is extensive Application is greatly limited.
Summary of the invention
It is an object of the invention to provide a kind of Nozzle weld defects detection side based on conventional Ultrasound angle probe Method, can be greatly improved Defect detection efficiency and the reliability of flaw detection of Nozzle weld by the method;Solve The practical problem that certainly angle welding flaw detection is high to engineering staff's experience dependency.The present invention the specific scheme is that
The present invention is by signal acquisition module, ultrasonic signal excitation/receiver module, sensor and numerical value emulation module Composition is as shown in Figure 1.Utilize numerical simulation module to carry out numerical simulation, obtain sensor detection position-amplitude Curve, weld defect can examine regional graphics;Detection angles and the detecting position of sensor is selected according to this simulation result Put and lay sensor;Ultrasonic signal excitation/receiver module produces pumping signal under control of the computer, logical Cross sensor excitation go out ultrasonic signal along detection test specimen launch, and by sensor receive reflection ultrasonic Ripple signal, is transferred to computer through ultrasonic exciting/receiver module the most again;By the collection in computer Software can obtain detection waveform, calculates the position that i.e. can determine that weld defect finally by sound path;Described biography Sensor uses single ultrasonic angle probe, described ultrasonic exciting/receiver module to use MULTY-2000 series Phased array instrument, described acquisition module use computer and with MULTY-2000 series phased array instrument The acquisition software that device matches, described software emulation module is by CIVA simulation software and MATLAB software Collectively constitute.
Specifically can be according to following steps examinations, method flow is shown in Fig. 6:
1) according to actual size and the defect distribution situation application numerical simulation module number of Nozzle weld Value simulation calculation, numerical simulation module is made up of CIVA simulation software and MATLAB software. First in CIVA software, constantly change the acoustic beam incident angle of sensor carry out emulation and obtain not With probe positions under angle-flaw indication echo amplitude curve.Then MATLAB software is used These amplitude curves are collected, and draws the detectable region figure of defect.
2) according to the probe positions obtained in step 1-echo-signal amplitude curve, echo-signal amplitude is found Maximum head angle and detection position, select the sensor of this angle and be installed in this inspection Location is put.
3) under control of the computer, ultrasonic exciting/receiver module produces ultrasonic excitation signals, passes through Sensor excitation goes out ultrasonic signal and launches along detection test specimen, is received anti-by sensor The ultrasonic signal penetrated, is transferred to computer through ultrasonic exciting/receiver module the most again, logical Cross the acquisition software on computer and can obtain the echo waveform of angle welding detection.Described is ultrasonic Sensor uses single ultrasonic angle probe, and described ultrasonic exciting/receiver module uses MULTY-2000 series phased array instrument, described signal acquisition module uses computer And the acquisition software supporting with MULTY-2000 series phased array instrument.
4) flaw echo being carried out location Calculation and determine defective locations, its sound path is mainly made up of two parts, Time t1 that ultrasound wave is propagated in skewback and the time t2 propagated in detection test specimen.Skewback The propagation delay caused is determined by semicircle standard steel test block, and ultrasound wave is in detection test block Propagation time record according to geometrical calculation.Determine defective locations accordingly.
The advantage of this detection method is to may be selected by out this Nozzle weld defect applicable before actually detected The optimal detection angle of the probe of detection and the optimal detection position of probe.Thus can be greatly improved defect Detection efficiency, improves the reliability of defects detection.And existing conventional angle probe detection method not only detection efficiency Low and easily missing inspection, and detection has the highest dependence for the professional experiences of engineering staff.Contrast simulation and reality The overall trend testing both results is basically identical, and the fitting degree of data is preferable.
Compared with existing detection method, the invention have the advantages that
1) head angle being suitable for detecting and riding position, the therefore detection efficiency to defect can be selected in advance Higher;
2) reliability of defects detection is higher, it is not easy to missing inspection;
3) less to the experience dependency of engineering staff.
Accompanying drawing explanation
Fig. 1 detects schematic diagram of device
The detectable region figure of Fig. 2 defect
Detection position-flaw echo the amplitude curve of Fig. 3 different angles angle probe
30 ° of probes of Fig. 4 are positioned at defects detection result figure during detection at 62mm
Fig. 5 pops one's head in simulation result and experimental result comparative pattern
Wherein 1 computer, 2 ultrasonic excitings/receiver module, 3 sensors, 4 numerical simulation modules, 5 can detect Region, 6 flaw echos.
Fig. 6 the inventive method flow chart
Detailed description of the invention
1) for the ease of processing and detection, detection test specimen is formed by the Plate Welding that two pieces of thickness is 40mm.First Application numerical simulation module carries out simulation calculation, sets up imitating as actual test specimen in CIVA software True mode, adds the poroid defect being perpendicular to the long 10mm of side surface, a diameter of 2mm in model.Will Probe is placed in lower shoe upper surface and detects, and frequency probe elects 2.25MHz as, and probe wafer size sets For 10mm, only change the angle of probe, from 30 ° to 60 ° every carrying out a simulation calculation twice. Obtain the sensing station under different angles-echo-signal amplitude curve.Converge with MATLAB software Total process obtain the probe positions-signal amplitude curve of this Nozzle weld defects detection and defect can Detection regional graphics.
2) detection during, when angle probe select different angles, be positioned over diverse location detect time, defect is returned The amplitude of ripple is different, therefore the most different to the Detection results of defect.Fig. 2 and Fig. 3 is obtained by step 1, As shown in Figure 2 this workpiece is existed to the region examined of a defect, region can be examined and be made up of several curves, This defect cannot be detected beyond this region.Can find from Fig. 3 under each special angle is popped one's head in Detect the detection position of this flaw echoes amplitude maximum.It appeared that along with the increase of head angle, The maximum amplitude of flaw echoes linearly rule constantly reduces.Complex chart 2 Fig. 3, it can be seen that when When head angle is between 30 ° to 46 °, flaw echoes amplitude is relatively big, and Detection results is preferable.And Along with the maximum amplitude increasing flaw indication echo of head angle tapers into.Result shows little angle Degree angle probe is higher to the remolding sensitivity of this defect, and correspond to one at each particular probe angle The individual optimum probe detection position i.e. position of flaw echoes amplitude maximum.This defect inspection as shown in Figure 2 The optimum head angle surveyed is 30 °, and the optimal detection position of this probe is at 62mm.Can select accordingly Select 30 ° of angle probes being placed at 62mm to detect.
3) under control of the computer, ultrasonic exciting/receiver module produces the ultrasonic excitation signals of characteristic frequency, Go out ultrasonic signal by sensor excitation to launch along detection test specimen, and receive reflection by sensor Ultrasonic signal, the most again through ultrasonic exciting/receiving instrument module transfer to computer, by meter Acquisition software supporting with MULTY-2000 phased array instrument on calculation machine can obtain returning of angle welding detection Waveform, as shown in Figure 4.Time zero in this figure is at 20us.
4) flaw indication being carried out location Calculation, the propagation delay that skewback causes is come really by semicircle standard steel test block Fixed, it is 10.56us that experiment records the time delay that 30 ° of skewbacks cause, ultrasound wave propagation time warp in test block It is calculated as 56.4us.Therefore flaw indication should be positioned at 66.96us.
Carry out the most again many groups experimentation, respectively probe has been placed in diverse location to this defect Detect, and experimental result is contrasted with simulation result, find that both fitting degree are the highest, therefore The method can realize testing requirement completely.

Claims (1)

1. a Nozzle weld detection method based on CIVA simulation software, this method by signal acquisition module, Ultrasonic signal excitation/receiver module, sensor and numerical value emulation module composition, it is characterised in that: utilize Numerical simulation module carries out numerical simulation, obtains sensor detection position-amplitude curve, and weld defect can be examined Regional graphics;Detection angles and the detection position of sound production sensor of sensor is selected according to simulation result;? Under the control of computer, ultrasonic signal excitation/receiver module produces pumping signal, is gone out by sensor excitation Ultrasonic signal is launched along detection test specimen, and is received the ultrasonic signal of reflection by sensor, so After be transferred to computer through ultrasonic exciting/receiver module again;By the acquisition software in computer Obtain detection waveform, calculate the position that i.e. can determine that weld defect finally by sound path;Described sensor Single ultrasonic angle probe, described ultrasonic exciting/receiver module is used to use MULTY-2000 series phase Control battle array instrument, described acquisition module use computer and with MULTY-2000 series phased array instrument The acquisition software that device matches, software emulation module is common by CIVA simulation software and MATLAB software Composition.
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