SU1290157A1 - Device for performing ultrasonic checking of articles - Google Patents

Abstract

This invention relates to the field of acoustic non-destructive testing methods. The aim of the invention is to improve the performance of the monitor. l double-layer bimetals with an uneven surface of the cladding due to the possibility of controlling in one pass the complete cross section of the product, including the fusion zone of the cladding with the base metal due to the simultaneous control of direct longitudinal, oblique transverse vibrations and head waves. The device for ultrasonic (UL) testing of products contains a suction line 1 and three piezoplates mounted on it, which form a direct transducer 2, designed to control shear ultrasonic vibrations, an oblique transducer 3 and an oblique transducer 4 intended to control head ultrasonic transducer 4 , 3 and 4 lie in the same plane, and at the inclined converters 3 and 4 they are directed towards each other. The piezoplast forming the direct transducer 2 is mounted on the guide tube 1 movably in a plane parallel to the working surface of the guide tube 1 and moves along it to distinguish the pulses from various defects. 2 Il. f (L yu with cd / (ffue.i

Description

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The invention relates to the field of acoustic non-destructive methods, control and can be used for ultrasonic (US) inspection of products, mainly two-layer, of a bimetal with uneven verification. by the nature of plating.

The purpose of the invention is to increase the productivity of controlling two-layer bimetals with an uneven surface of the cladding due to the possibility of monitoring in one pass the complete cross section of the product, including the fusion zone of the cladding with the base metal. FIG. 1 shows a device for ultrasonic testing of a product.

LI, general view; in fig. 2 is a control circuit using an ultrasound product inspection device.

The device for ultrasonic (UL) monitoring of products contains a sound wire (case) 1 and three piezoplates mounted on it with a fixed-. input angles that form a direct transducer 2, designed to control shear ultrasonic vibrations with an input angle C, an oblique transducer 3 and intended to control transverse ultrasound waves with an oblique transducer 4. Transducers 2–4 are installed on a trapezoidal acoustic tube 1 such that their acoustic axes are coplanar, i.e. lie in the same plane, with the acoustic axes of the inclined transducers 3 and 4 are directed towards each other. The oblique transducers 3 and 4 are rigidly fixed on the lateral faces of the sound duct 1, as a result of which fixed points F and F of the input of ultrasonic vibrations on the working surface of the sound guide 1 are formed. The direct converter 2 is mounted on the sound duct 1 in parallel it, and therefore, the working surface of the Zvukovaya 1. The product to be inspected contains the base metal 5 and the cladding 6 and may include defects in the base metal. five; subsurface 7, internal 8 and defect 9 (such as delamination at the boundary of the base metal 5 and plating 6). The device for ultrasonic inspection of products also contains a flaw detector 10 with an electron-beam indicator 11,

electrically connected to each of the transducers 2–4. During operation, the following echo signals are recorded on the indicator 11 of the flaw detector 10: probe - 12, from defect 7, received by the converter 4-13, from defect 9, received by the converter 2-14, bottom, received by converter 2-15, from defect 8, received by converter 3-16. The distance 1 between the points FI and F of the input of the inclined converters 3 and 4 to optimize the dimensions of the device while monitoring the elements with a known range of possible tol1 Qin H is chosen from the ratio

  Ctgot,

where cL is the angle of input from oscillations of an inclined transducer 3. A device for ultrasonic testing of products works as follows.

Sound duct 1 set working surface on the base metal 5 of the controlled product. The transducers 2–4 emit ultrasonic pulses that propagate in a controlled product and are reflected from possible defects 7–9 and the free surface of cladding 6. The transducers 2–4 receive reflected ultrasonic pulses, which are recorded on the indicator 11 of the flaw detector 12. The bottom pulse 15 is on the display of the indicator 11 during the scanning almost constantly in one place, changing only

amplitude depending on the plating profile 6 or when shielded by defect 9, and can serve as a reference point in determining the type and location of defects 7–9. Pulses 13 from subsurface defects 7 are taken as an inclined converter 4 and differ from other pulses in that they have significant

running on the screen of the indicator 11 and, approaching the probe pulse 12, increase in amplitude. The pulses 14 from defects 9 (such as delamination on the boundary of the base metal 5 and

The claddings 6) are received by the forward transducer 2 and are located on the display of the indicator 11 to the left of the bottom pulse 15 at a distance determined by the thickness of the cladding 6, and the increased performance of the ultrasonic scanner is of particular importance when the control time is limited.

5 equipment pipelines in the premises of the primary circuit of nuclear power plants. In a number of cases, due to the inclusion in the device of an inclined converter of head waves, it is possible to turn on the magnetic particle inspection of products,

Claims (1)

Invention Formula 5 A device for ultrasonic testing of products containing a sound conductor and three piezoplates mounted on it, the middle piezoplate installed parallel to the working surface. The extreme displacement of the transducer surface angle to it and towards each other, with the acoustic axes of piezoplates t than they do not change their location during the scan. The pulses 16 from defects 8, received by the converter 3, can be located on the indicator 11 both to the right of the bottom pulse 15 (Fig. 2) and to the left of it, depending on the depth of the defect 8. Dp difference of the pulses 16 from the pulses 14 ( in case of occurrence of the first one at this place), as well as from impulses (not shown), reflected by defect 8 and received by converter 2, the latter is moved along body 1 in a plane parallel to the working surface at a fixed position of the device case 1. At the same time, pulse 16 remains unchanged in location and amplitude, while all other pulses are not. The transducer 2 via the conduit 1 allows for the implementation of a separate switching circuit for oblique 3 (radiator) and direct 2 (receiver) transducers, used, for example, for layer-by-layer testing of products. 25 lie in one plane, characterized in that, in order to increase the monitoring performance of double-layer bimetals with an uneven surface of the cladding, the angle of inclination of one of the extreme piezoplates is equal to the first critical angle, the limits bounded by the entry points of the extreme piezoplates. Thus, the proposed device for ultrasonic inspection of products allows for a single pass to control the total cross section of the product and to reveal both the defects of the base metal — internal and subsurface (10 mm), and defects such as delamination at the boundary of the base metal and the cladding. t lie in one plane, characterized in that, in order to increase the monitoring performance of double-layer bimetals with an uneven surface of the cladding, the angle of inclination of one of the extreme piezoplates is equal to the first critical angle, the limits bounded by the entry points of the extreme piezoplates.