CN102520067A

CN102520067A - Tube seat fillet welding seam detection method based on CIVA simulation software

Info

Publication number: CN102520067A
Application number: CN2011104251734A
Authority: CN
Inventors: 焦敬品; 侯松; 刘伟; 何存富; 吴斌
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2011-12-16
Filing date: 2011-12-16
Publication date: 2012-06-27
Anticipated expiration: 2031-12-16
Also published as: CN102520067B

Abstract

The invention relates to a tube seat fillet welding seam defect ultrasonic detection method based on CIVA software, belonging to the field of non-destructive detection. The method disclosed by the invention comprises the following steps of: carrying out numerical simulation by utilizing a numerical simulation module to obtain a detection position-amplitude curve of a sensor and a welding seam defect detectable area graph; placing the sensor by selecting a detection angle and a detection position of the sensor according to a simulation result; generating excitation signals by an ultrasonic signal exciting/receiving module under the control of a computer, exciting ultrasonic signals through the sensor and transmitting the ultrasonic signals along a detection test piece, receiving reflected ultrasonic signals through the sensor, and transmitting the reflected ultrasonic signals to the computer through the ultrasonic signal exciting/receiving module; and obtaining a detection waveform through acquisition software in the computer, and finally determining the position of welding seam defects by calculating a beam path. The method disclosed by the invention is capable of greatly increasing defect detection efficiency and defect detection reliability of tube seat fillet welding seams.

Description

A kind of base fillet weld detection method based on the CIVA simulation software

Technical field

The present invention relates to a kind of base fillet weld defect inspection method based on the sound field simulation software, this method is mainly used in base fillet weld class formation, belongs to the Non-Destructive Testing field.

Background technology

Collecting box pipe seat fillet weld is connecting pipe row and the rigid structure that collects case, and its structural stress mainly concentrates on the fillet weld root.This fillet weld cooling velocity in welding process is fast, occurs defectives such as lack of penetration, incomplete fusion, crackle easily, and its Service Environment generally is accompanied by the big temperature difference, causes crackle and the not expansion of integration region easily.Analysis result to some thermal power plant's fillet welds leakages in recent years shows; The most of leakage is that expansion causes because defect risks such as that fillet weld forms in manufacture process is lack of penetration, incomplete fusion, crackle are in operation, and be therefore most important to the check of fillet weld inherent vice.

UT (Ultrasonic Testing) is higher to harmfulness area-type flaw detection sensitivities such as lack of penetration, incomplete fusion, crackles, and this method is the main developing direction of fillet weld inherent vice check.But since the base fillet weld complex-shaped, structure is special, weld seam cross section everywhere is all inequality, and with angle probe at diverse location during to this type seam inspection, the position and the rule of defect waves appearance are also inequality.Generally need the testing staff of specialty that this type weld seam is carried out UT (Ultrasonic Testing), otherwise judge by accident easily or the omission major defect.Therefore improve the reliability of the detection efficiency of base fillet weld defective and defects detection thereof particularly important.

Low for overcoming common angle probe detection efficiency, shortcomings such as loss height can be utilized a plurality of array elements to form transducer array and carry out the phased array Non-Destructive Testing.The phased array ultrasonic detection technology transmits and receives ultrasound wave through each array element in the electronic system control transducer array according to certain rule time delay, realizes sector display, sound beam focusing.Therefore, phased array detects has quick, accurate, adaptable advantage, and the recall rate of defective is high.But phased time-delay radiating circuit is very complicated, and is very high with delay requirement synchronously to what transmit, and along with the increase of array element number, all significantly increases of the complicacy of control battle array circuit production and cost, therefore, its widespread use has received great restriction.

Summary of the invention

The object of the present invention is to provide a kind of base fillet weld defect inspection method, can improve the defective flaw detection efficient of base fillet weld and the reliability of flaw detection greatly through this method based on the ultrasonic angle probe of routine; Solve the fillet weld flaw detection to the high practical problems of engineering staff's experience dependence.Concrete scheme of the present invention is:

The present invention forms as shown in Figure 1 by signal acquisition module, ultrasonic signal excitation/receiver module, sensor and numerical simulation module.Utilize the numerical simulation module to carry out numerical simulation, obtain sensor position-amplitude curve, weld defect can be examined regional graphics; Select the detection angles and the detection position of sensor to lay sensor according to this simulation result; Ultrasonic signal excitation/receiver module produces pumping signal under the control of computing machine; Going out ultrasonic signal through sensor excitation launches along detecting test specimen; And, be transferred to computing machine through ultrasonic exciting/receiver module again then through the ultrasonic signal that the sensor reception is reflected; Can obtain detection waveform through the acquisition software in the computing machine, calculate the position that to confirm weld defect through sound path at last; Described sensor adopts single ultrasonic angle probe; Described ultrasonic exciting/receiver module adopts MULTY-2000 series phased array instrument; What described acquisition module adopted is that computing machine reaches the acquisition software that matches with MULTY-2000 series phased array instrument, and described software emulation module is made up of CIVA simulation software and MATLAB software jointly.

Specifically can implement to detect according to following steps, method flow be seen Fig. 6:

1) carry out numerical simulation calculating according to the physical size and the defect distribution situation application numerical simulation module of base fillet weld, the numerical simulation module is made up of CIVA simulation software and MATLAB software.

The acoustic beam incident angle that at first in CIVA software, constantly changes sensor carries out emulation and obtains probe positions under the different angles-flaw indication echo amplitude curve.Use MATLAB software that these amplitude curves are gathered then, and draw the detectable region figure of defective.

2) according to the probe positions that obtains in the step 1-echoed signal amplitude curve, find echoed signal amplitude maximum head angle and detection position, select the sensor of this angle and it is installed on this detection position.

3) under the control of computing machine; Ultrasonic exciting/receiver module produces the ultrasonic exciting signal; Going out ultrasonic signal through sensor excitation also launches along detecting test specimen; Receive the ultrasonic signal that reflects through sensor, be transferred to computing machine through ultrasonic exciting/receiver module again then, can obtain the echo waveform that fillet weld detects through the acquisition software on the computing machine.Described sonac adopts single ultrasonic angle probe; What described ultrasonic exciting/receiver module used is MULTY-2000 series phased array instrument, and what described signal acquisition module adopted is computing machine and and the supporting acquisition software of MULTY-2000 series phased array instrument.

4) flaw echo is positioned calculating and confirm defective locations, its sound path mainly is made up of two parts, time t1 that ultrasound wave is propagated in skewback and the time t2 that in detecting test specimen, propagates.The propagation delay that skewback causes confirms that through semicircle standard steel test block the travel-time of ultrasound wave in detecting test block records according to geometrical calculation.Come to confirm defective locations in view of the above.

The advantage of this detection method is before actual detected, just to select the optimal detection angle of the probe that is fit to this base fillet weld defects detection and the optimal detection position of probe.So just can improve the detection efficiency of defective greatly, improve the reliability of defects detection.And existing conventional angle probe detection method not only detection efficiency is low but also easy omission, and the professional experiences that detects for the engineering staff has very high dependence.The overall trend basically identical of contrast simulation and experimental result, the fitting degree of data is better.

Compare with existing detection method, the present invention has the following advantages:

1) can select head angle and the riding position that is fit to detection in advance, therefore higher to the detection efficiency of defective;

2) reliability of defects detection is higher, is not easy omission;

3) less to engineering staff's experience dependence.

Description of drawings

Fig. 1 pick-up unit schematic diagram

The detectable region figure of Fig. 2 defective

The detection position of Fig. 3 different angles angle probe-flaw echo amplitude curve

Defects detection when 0 ° of probe of Figure 43 is positioned at the detection of 62mm place is figure as a result

Fig. 5 pop one's head in simulation result and experimental result comparative pattern

1 computing machine wherein, 2 ultrasonic excitings/receiver module, 3 sensors, 4 numerical simulation modules, 5 detectable region, 6 flaw echos.

Fig. 6 the inventive method process flow diagram

The practical implementation step:

1) for the ease of processing and detection, the steel plate that the detection test specimen is 40mm by two thickness is welded.At first use the numerical simulation module and carry out simulation calculation, in CIVA software, set up the realistic model the same, add perpendicular to the long 10mm of side surface, the poroid defective that diameter is 2mm in the model with actual test specimen.Place the lower shoe upper surface to detect probe, frequency probe is elected 2.25MHz as, and the probe wafer size is made as 10mm, only changes the angle of probe, and is every at a distance from carrying out one time simulation calculation twice from 30 ° to 60 °.Obtain the sensing station-echoed signal amplitude curve under the different angles.Carry out aggregation process with MATLAB software and obtain the probe positions-signal amplitude curve of this base fillet weld defects detection and the detectable region figure of defective.

2) in the testing process, select different angles, be positioned over diverse location when detecting when angle probe, the amplitude of flaw echo is different, and therefore the detection effect to defective is also different.Obtain Fig. 2 and Fig. 3 by step 1, can know the zone examined that has a defective for this workpiece, can examine the zone and constitute, can't detect this defective in addition in this zone by several curves by Fig. 2.From Fig. 3, can find under each special angle probe and detect the maximum detection position of this flaw echoes amplitude.Can find the increase along with head angle, the maximum amplitude of flaw echoes is linear rule and constantly reduces.Synthesizing map 2 Fig. 3, can find out when head angle bigger 30 ° of amplitudes of flaw echoes between 46 ° the time, it is better to detect effect.And along with the maximum amplitude of the increase flaw indication echo of head angle diminishes gradually.The result shows that the low-angle angle probe is higher to the remolding sensitivity of this defective, and all corresponding optimum probe detection position is the maximum position of flaw echoes amplitude at each particular probe angle place.Can know that by Fig. 2 the optimum head angle of this defects detection is 30 °, the optimal detection position of this probe is the 62mm place.Can select 30 ° of angle probes in view of the above and be placed in the 62mm place to detect.

3) under the control of computing machine; Ultrasonic exciting/receiver module produces the ultrasonic exciting signal of CF; Go out ultrasonic signal through sensor excitation and launch, and receive the ultrasonic signal that reflects, be transferred to computing machine through ultrasonic exciting/reception instrument module again then through sensor along detecting test specimen; Through obtaining the echo waveform that fillet weld detects with the supporting acquisition software of MULTY-2000 phased array instrument on the computing machine, as shown in Figure 4.Time zero among this figure is the 20us place.

4) flaw indication is positioned calculating, the propagation delay that skewback causes confirms through semicircle standard steel test block, and it is 10.56us that experiment records the time-delay that 30 ° of skewbacks cause, the travel-time of ultrasound wave in test block is through being calculated as 56.4us.Therefore flaw indication should be positioned at the 66.96us place.

Under laboratory condition, carried out many groups experimental study again; Place diverse location that this defective is detected probe respectively; And experimental result and simulation result compared, find that both fitting degree are very high, so this method can realize detecting requirement fully.

Claims

1. base fillet weld detection method based on the CIVA simulation software; The present invention is made up of signal acquisition module, ultrasonic signal excitation/receiver module, sensor and numerical simulation module; It is characterized in that: utilize the numerical simulation module to carry out numerical simulation; Obtain sensor position-amplitude curve, weld defect can be examined regional graphics; Select the detection angles and the detection position of sensor to lay sensor according to this simulation result; Ultrasonic signal excitation/receiver module produces pumping signal under the control of computing machine; Going out ultrasonic signal through sensor excitation launches along detecting test specimen; And, be transferred to computing machine through ultrasonic exciting/receiver module again then through the ultrasonic signal that the sensor reception is reflected; Can obtain detection waveform through the acquisition software in the computing machine, calculate the position that to confirm weld defect through sound path at last; Described sensor adopts single ultrasonic angle probe; Described ultrasonic exciting/receiver module adopts MULTY-2000 series phased array instrument; What described acquisition module adopted is that computing machine reaches the acquisition software that matches with MULTY-2000 series phased array instrument, and described software emulation module is made up of CIVA simulation software and MATLAB software jointly.