SU1206691A1 - Method of ultrasonic quality inspection of article diffusion welding - Google Patents

Description

FIG. one

This invention relates to the field of acoustic non-destructive testing and can be used to control the quality of diffusion welding.

The purpose of the invention is to increase the reliability of control by detecting defects that have a low reflection coefficient of ultrasound, such as oxide films, by using as the measured displacement parameters of the maximum frequency components of the spectrum of the received bottom and reflected from the diffusion welding zone pulses.

Figure 1 shows the functional diagram of the device that implements the proposed method; 2 shows the dependences of the welded joint strength limit d on the value of l {;, the shift of the maximum frequency components of the spectrum of received pulses relative to the maximum frequency component of the spectrum of the emitted pulses for diffusion welding of titanium VTZ-1 (for echo pulses reflected from the zone diffusion welding; for bottom echo pulses S).

A device that implements the method of ultrasonic quality control of diffusion welding of products, contains a series of short pulses generator 1, a broadband amplifier 2, a time selector 3, and a spectrum analyzer A. The device also contains included between the generator 1 and amplifier 2

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wideband transducer 5, for example, designed for a minimum frequency of less than 1 MHz and a maximum frequency of more than 10 MHz. The method of ultrasonic quality control of diffusion welding of products is as follows. - Install transducer 5 on the test item 6. Radiate with the help of generator 1 and transducer 5 into ultrasonic probe 6

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five

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five

forcible pulses whose maximum frequency component of the spectrum is known. Part of the ultrasonic vibrations is reflected from diffusion welding zone 7 and returns to transducer 5, and some passes through zone 7, reflects from the bottom surface of the Item 6 and also returns to transducer 5. Reflected echo pulses are received by transducer 5 and amplified as an electrical signal. These received signals are then separated by means of the selector 3 from the interference signals and are alternately fed to the spectrum analyzer 4. Using analyzer 4, the maximum frequency components of the spectrum of the received pulses are determined and measured, the shift relative to the maximum frequency component of the spectrum of the emitted pulses. Using measured parameters, the quality of welding is estimated, for example, by calibration dependencies similar to those shown in Fig. 2.

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Branch PSh1 Patent, Uzhgorod, Proektna St., 4

Claims (1)

METHOD OF ULTRASONIC QUALITY CONTROL OF DIFFUSION WELDING OF PRODUCTS, which consists in emitting ultrasonic pulses into the product, receiving bottom and echo pulses reflected from the diffusion welding zone, characterized in that, in order to increase the reliability of control, the shift of the maximum frequency components of the spectrum is measured pulses relative to the maximum frequency component of the spectrum of the emitted pulses and it determines the quality of diffusion welding. Fig 1 120669