SU1460697A1 - Ultrasonic echo-pulse transducer - Google Patents

Abstract

The invention relates to non-destructive ultrasonic testing of a product. The purpose of the invention is to increase the reliability of control by determining the type of defect. Synchronizer 1 generates pulses with a following frequency, directly proportional to the speed of movement of the object being monitored. Synchronization pulses and pulses from an automatic detector of 2 defects go to elements 17 and 3 of coincidence, respectively. In the presence of a defect signal, they open and start counting in reverse meters 18, 4 and 5, where, in the initial state, various numbers correspond to the measurement cycle, the defective part of the product and the type of defect. Recorders 10, 12, and 14, respectively, display the numbers of current measurement cycles for the number of defects and types of defects. il „$ (L

Description

The invention relates to the failure of shielding tests and can be used in the development of installations for the automatic ultrasonic testing of products, for example, for the control of slabs welded using high frequency current where vertically ornantized defects are likely.

The purpose of the invention is to increase the reliability of control by determining the type of defects.

The drawing shows the block diagram of the pulse echo flaw detector.

The flaw detector contains a synchronizer 1 connected in series, an automatic defect signaling device 2 (ASD), a first coincidence element 3 and a reversible counter A. A reversible counter 5 is connected to the output of a coincidence element 3, a reversing trigger 6 and a trigger 7 are connected to the output of reversing counters 4 and 5 - but. The outputs of the latter are connected to the first and second inputs of the decoder 8, the outputs of which are connected in series by the trigger 9 and the first recorder 10, the trigger I and the second recorder 12, the trigger 13 and the third recorder 14 In series of the ASD 2 are connected in series the trigger 15 and the one-oscillator 16 to the output of the synchronizer 1. - the first input of the coincidence element 17, to the output of which a reversible counter 18 is connected. The output of the trigger 15 is connected to the second inputs of the elements 3 and 17 of the coincidence and the input of the decoder 8o One-shot output and 16 is connected to the control inputs of the reversing counters 4, 5 and 18 and the inputs of the flip-flops 6 and 7. The output of the reversible counter 18 is connected to the second inputs of the flip-flops 9, 11, 13 and 15. The code switches 19-21 are respectively connected to the summing inputs of the counters .

The operation of the flaw detector is based on the fact that the number of pulses K emitted by an automatic detector of 2 defects tuned to a given amplitude depends on the welding quality of the object being monitored for a length determined by the number of pulses KU in one flaw detector operation cycle and scanning step. So it is experimentally established that

defects associated with underheating during high-frequency welding reflect a greater number of ultrasonic pulses than defects associated with overheating. This is due to the different reflectivity of the defects and the geometrical dimensions.

Thus, in order to recognize the type of detected defects, it is necessary to calculate the number of pulses reflected from defects with an amplitude higher than a given one at a length determined by the flaw detector operation cycle.

Flaw detector works as follows about

When the flaw detector is switched on, all the triggers are initially set to the zero state, thus preparing the flaw detector for operation (not shown).

Synchronizer I generates pulses, the frequency of which is directly proportional to the linear velocity of the object being monitored. The synchronization pulses arrive at the first input of the coincidence element 17 and through the ASD 2 to the input of the coincidence element 3.

When there is a single signal at the second inputs of elements 3 and 17, the pulses arriving at the subtracting input of the reversing counters 18, 4 and 5 appear at the outputs of the latter.

The first impulse from the defect from the output of the ASD 2 arrives at the first input of the trigger 15 and sets at its output a signal 1, which goes to the second inputs of elements 3 and 17 of the match and to the one-shot 16. The last scientific research institute generates the impulse to record in reversible counters of numbers set on code switches 19-21.

The reversible counter 18 records the number Kc, which determines the number of pulses in one cycle of operation of the defectoscope into the reversible counter 4 -. The number K, which serves as a criterion for dividing the monitored area into a quality or defective one, into the reversible counter 5 is the number K, which serves as a criterion for determining the type of defects in the monitored defect area. Moreover, condition K is satisfied.

3U60697

The sync pulses through the match element 17 are fed to the reversible counter 18 and begin to be subtracted from the Cc number. Impulses 1, from the output of the ASD 2, through element 3, coincidences are fed to the reversible counters 4 and 5 and subtracted from the numbers Kj and Kj. If the number of pulses arriving at the reversible counters 4 and 5 is greater than K, then the signals at the outputs of these reversible counters switch triggers 6 and 7 to a single state. If the number of pulses arriving at the reversible counters 4 and 5 is greater than K ,, but less than Kj, then only the trigger 7 is switched to one state.

At the end of the flaw detector's cycle of operation, the reversible counter 18 produces a pulse that transfers the triggers 9, 11, 13, and 15 to the zero state. The trigger 15 permits the operation of the decoder 8, at one of the outputs of which a signal appears that depends on the state of the flip-flops 6 and 7, which takes the corresponding trigger to one state, and turns on the recorder connected to this flip-flop.

The next cycle of the flaw detector operation begins with the arrival on the trigger 15 of the first pulse with ASD 2.

The use of the proposed synchronously connected synchronously, automatic defect signaling device, the first trigger and the first falling element, connected in series to the second coincidence element, which is connected to the sync output, and the first reversible counter connected to its summing input.

10 controllers first code switch,

The first recorder and the second trigger, characterized in that, in order to increase the reliability of the controller, it is equipped with a sequential

15 connected by a second code switch, a second reversible counter, a third trigger, a decoder and a fourth trigger, the output of which is connected to the first recorder, sequentially connected by a third code switch and a third reversible counter, the output connected to the first input of the second trigger connected to the output of with the input of the decoder, connected in series with the fifth trigger, whose input is connected with the output of the descriptor and the second recorder, respectively connected with the sixth three

A 30 meter, whose input is connected to the output of the decoder, and a third register, and a single vibrator, the output of which is connected to the control input of the reversible meters and the second and

20

25

the tonic sound pulse echo defect-35 of the third trigger, the output of the first

A scopus in active non-destructive testing systems will allow to increase the reliability of the control by recognizing the type of detected defects, which is especially important for the timely adjustment of the welding process parameters.

the reversible counter is connected to the control inputs of the first, fourth, fifth, and sixth triggers, the output of the automatic signaling defect is connected to the second input of the first match element, the output of which is connected to the subtractors of the second and third reversible counters, and the first trigger code is connected the input of the second element of the fall, the input of the one-shot and the third input of the decoder.

Claims (1)

Invention Formula An ultrasonic pulse echo flaw detector containing a series-connected synchronizer, an automatic defect detector, a first trigger and a first match element, a second match element connected in series, the input of which is connected to the synchronizer output, and a first reversible counter connected to its summing input, the first code switch, The first recorder and the second trigger, characterized in that, in order to increase the reliability of the control, it is provided with 5 connected by a second code switch, a second reversible counter, a third trigger, a decoder and a fourth trigger, the output of which is connected to the first recorder, connected in series by a third code switch and a third reversible counter, the output of which is connected to the first input of the second trigger connected by the output to the second input of the decoder connected in series by a fifth trigger, whose input is connected to the output of the decoder and the second recorder, connected in series by a sixth rig0 gerom having an input coupled to the output of the decoder, and the third recorder, and a monostable whose output is connected to the control inputs of the reversible counter and the second and 0 five third triggers exit first the reversible counter is connected to the control inputs of the first, fourth, fifth, and sixth flip-flops, the output of the automatic defect indicator is connected to the second input of the first coincidence element, the output of which is connected to the subtracting inputs of the second and third reversible counters, and the code of the first trigger is associated with the input of the second element matching, the input of the one-shot and the third input of the decoder.