SU1446560A1 - Method of ultrasonic inspecting of welds with large-dendrite structure - Google Patents

Abstract

This invention relates to acoustic methods of intact control. The aim of the invention is to increase the sensitivity of the control due to the choice of the angle between the plane of inclination of the transducer and the plane of the controlled cross-section of the weld, thereby providing input ultrasonic (knots) oscillations, the vibration front of which has the same phases in the direction

Description

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Piezoplastin 1 radiates ultrasonic longitudinal vibrations into prism 2. On the dividing plane 4, ultrasonic vibrations are transformed into horizontally polarized transverse oscillations, which are inserted into the weld 6 of article 5 through the prism 3. Angle § between the 7 tilt plane

The transducer and the plane 8 of the controlled cross section of the seam 6 are determined from the angles c /, and "/ prisms 2 and 3, respectively, and the angle o / j of the fall of the ultrasonic vibrations on the surface of the product 5, and the transducer is installed accordingly. Ultrasonic vibrations are reflected from defect 9 and return to the piezoplate 1, 1 sludge.

.1 - - The invention relates to acoustic methods of non-destructive testing and can be used for ultrasonic (US) inspection of weld seams with a large dendritic structure.

The aim of the invention is to increase the sensitivity of the control by choosing the angle between the plane of inclination of the transducer and the plane of the controlled cross-section of the weld.

The drawing shows the scheme of implementation of the method of ultrasonic control of welds with coarse-dendritic structure.

Inclined ultrasonic transducer contains piezoplate 1 longitudinal ultrasonic vibrations, the main inclined prism 2 with angle o, and additional inclined prism 3 with angle cij. Prisms 2 and 3 are separated by plane 4. The transducer is mounted on product 5. with weld seam 6, position 7 in the drawing indicates the plane of inclination of the converter or the plane of incidence of oscillations in the converter, position 8 - the cross-section plane of the weld 6, and position 9 - defect of the weld 6.

An ultrasonic inspection method for welds with a large dendritic structure is as follows.

With the help of piezoplates 1, the transducer radiates into the main inclined prism 2 longitudinal ultrasonic vibrations, which transform on the separation plane 4 into horizontally polarized transverse vibrations. Horizontally-polarized transverse ultrasonic vibrations, passage through an additional inclination prism 3.

five

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five

0

five

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in the weld seam 6 of product 5. From the angle of inclination o (j of the fall of the ultrasonic vibrations, the plane T of the transducer is determined. According to the formula

5 arctgttg (c, -d.j) / sino (3J, where is the angle between the converter tilt plane 7 and the control plane 8 of the controlled cross-section of the weld 6 of product 5; 1 is the tilt angle of the main prism

2 transducers} (/ 2 additional tilt angle

prism 3 transducer} the angle of incidence of ultrasonic vibrations on the surface of article 5, angle 6 is determined and the transducer is set accordingly. The ultrasonic vibrations emitted by the piezo-plate 1 are reflected from the defect 9 and then returned to the piezoplate 1. The defectiveness of the weld 6 with the large-dendritic structure of the product 5 is determined by the magnitude of the reflected ultrasonic vibrations.

When checking the product thickness. 45 mm of OX1RH9T steel using the DUK-66PM ultrasonic flaw detector with the use of ebonite and plexiglas transducer prisms (-10 °; oii 4-30; 15 °) are calculated according to the calculated dependence. A defect with a diameter of 2.6 mm is detected, the echo pulse from which exceeds the echo pulse from the structure by 12-15 dB. The useful signal also exceeds by 6-10 dB echo the pulse obtained by a known method. When using a dual-integrated converter, the control sensitivity is improved by 6 dB.

Inclined entry of horizontally polarized transverse vibrations into the product, i.e. across the axes of the dendrites, when the angle f, calculated using the formula, provides for the introduction of ultrasonic vibrations, the oscillation front of which has the same phases in the direction coinciding with the weld cross section, as a result of which a satisfactory signal-to-noise ratio is achieved, which causes sensitivity control.

Claims (1)

Invention Formula The method of ultrasonic testing of welds with a large-dendritic structure, consisting in the arrangement of a transducer with two prisms in the heat-affected zone, radiation of horizontally-polarized transverse oscillations by the transducer Order 6743/50 Circulation 847  State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and printing company, Uzhgorod, st. Project, 4 cloned to the product surface so that the tilt plane of the transducer and the plane of the controlled cross section of the weld form an angle f, receive ultrasonic vibrations reflected from the defect, measure the parameters of the received vibrations, and determine the measured defectiveness parameters measured by the measured parameters that, in order to increase the sensitivity of the control, the angle between the plane of inclination of the converter and the plane of the controlled cross section of the weld bead is chosen from the condition   arctgCtgW, - "f2) / sino 3 0 where (/ and - the angles of the prism transducer; 3 - the angle of incidence of ultrasonic vibrations. Subscription