RU170577U1 - ULTRASONIC TILT CONTROL CONVERTER OF THE UNIT OF WELDING THE COLLECTOR TO THE STEAM GENERATOR - Google Patents

Abstract

Usage: to control the quality of the welded joint, in particular the site of welding the collector to the steam generator. The essence of the utility model lies in the fact that the ultrasonic oblique transducer for monitoring the collector welding unit to the steam generator contains a prism and a piezoelectric element connected to it, which is located above the prism base on an inclined surface of the cavity made in the prism body, while the inclined surface with the piezoelectric element is placed at an angle of 38 -42 ° to the base of the prism, and the piezoelectric element is made of lead zirconate titanate in the form of a rectangular parallelepiped with a ratio of length to thickness of 26-30. EFFECT: creation of an ultrasonic inclined transducer providing for the elimination of spurious signals and an increase in the signal-to-noise ratio during ultrasonic testing in full of the control unit for welding the collector to the steam generator. 1 s.p. f-ly, 2 ill.

Description

The utility model relates to non-destructive testing devices and can be used to control the quality of a welded joint, in particular, a unit for welding a collector to a steam generator.

Known ultrasonic inclined transducer containing a prism and connected to it a piezoelectric element, which is placed over a controlled surface on an inclined surface of the cavity made in the body of the prism.

(SU 1783415, G01N 29/22, published 12/23/1992)

A disadvantage of the known technical solution is the lack of resolution and a sufficiently high level of acoustic noise when used to control the site of welding the collector to the steam generator.

The closest in technical essence and the achieved technical result is an ultrasonic inclined

a control transducer of the collector welding unit to the steam generator, comprising a prism with an acoustic trap and connected to the prism of the piezoelectric element, which is located above the base of the prism on an inclined surface, the prism is placed in a metal case, on the side wall of which there is an electrical connector, the electrical inputs of which are connected to the piezoelectric element and between each other through the throttle, and the inclined surface with the piezoelectric element is located in the cavity made in the body of the prism, and is placed at an angle of 25-30 ° to the base prism.

(RU 150291, G01N 29/22, published 02/10/2015)

A disadvantage of the known technical solution is an unacceptable level of spurious signals and insufficient signal-to-noise ratio when sounding the control units for welding the collector to the steam generator at various angles, including an angle range of 35-45 °.

The objective and technical result of the utility model is an inclined ultrasonic transducer, which eliminates spurious signals and increases the signal-to-noise ratio during ultrasonic testing in full of the control unit for welding the collector to the steam generator

The technical result is achieved in that the ultrasonic oblique transducer for monitoring the collector welding unit to the steam generator contains a prism and a piezoelectric element connected to it, which is placed above the prism base on an inclined surface of the cavity made in the prism body, while the inclined surface with the piezoelectric element is placed at an angle of 38-42 ° to the base of the prism, and the piezoelectric element is made of lead zirconate titanate in the form of a rectangular parallelepiped with a ratio of length to thickness of 26-30.

The technical result is also achieved by the fact that part of the prism is placed in a metal casing, on the side wall of which there is an electrical connector, the electrical inputs of which are connected to the piezoelectric element, and between each other through a throttle.

The use of an ultrasonic oblique transducer according to a utility model can be illustrated by an example using FIG. 1 and 2, where:

1 - prism;

2 - the inclined surface of the cavity;

3 - piezoelectric element;

4 - converter housing;

5 - electrical connector;

6 - throttle;

7 - cavity;

α ° is the angle of inclination of the surface with the piezoelectric element.

The converter according to the utility model works as follows.

The prism of the transducer 1, made of organic glass, part of which is placed in a metal case 4, is installed on the surface of the collector connected by welding with a steam generator at an angle of 40 °. At the same time, the piezoelectric element 3, mounted in the cavity of the body 7 of the prism 1 on an inclined surface 2, which is placed at an angle α ° = 40 ° to the base of the prism, is in the most optimal position relative to the controlled volume of the collector, the root of the welding unit and possible defects (cracks, lack of fusion, etc.).

The piezoelectric element 3 (28 × 20 × 1 mm) is made of lead zirconate titanate (TsTS-21) in the form of a rectangular parallelepiped with an optimal ratio of length to thickness of 26-30, while its width practically does not affect the technical result achieved.

From the recording device, an electrical pulse with a frequency of 5 MHz through the insulated inputs of the electrical connector 5 located on the side wall of the housing 4, which are interconnected via the inductor 6, is fed to the piezoelectric element 3. The piezoelectric element 3 generates acoustic vibrations of a certain frequency, which are transmitted through the prism 1 to the object control. The signal reflected from the defect is recorded by the piezoelectric element 3 and transmitted to the recording device for processing.

The constructive solution of the transducer prism according to the utility model, combined with the fact that the piezoelectric element (28 × 20 × 1 mm) is made of lead zirconate titanate in the form of a rectangular parallelepiped with a length to thickness ratio of 26-30, ensures the elimination of spurious signals and an increase of 15- 20% signal-to-noise ratio.

Claims (2)

1. An ultrasonic inclined transducer for monitoring the assembly of the weld of the collector to the steam generator, comprising a prism and a piezoelectric element connected to it, which is located above the base of the prism on an inclined surface of the cavity made in the body of the prism, characterized in that the inclined surface with the piezoelectric element is placed at an angle of 38-42 ° to the base of the prism, and the piezoelectric element is made of lead zirconate titanate in the form of a rectangular parallelepiped with a ratio of length to thickness of 26-30. 2. The ultrasonic transducer according to claim 1, characterized in that a part of the prism is placed in a metal housing, on the side wall of which there is an electrical connector, the electrical inputs of which are connected to the piezoelectric element, and between each other through a throttle.

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