SU1280526A1 - Method of ultrasonic checking of welded joints - Google Patents

Abstract

This invention relates to the field of non-destructive agents and control methods. The aim of the invention is to improve the control reliability by detecting sticking defects. Transducers I and 2 are mounted on product 3 outside the weld zone 4 in a position corresponding to the maximum amplitude of signals reflected from the bottom surface of the product. The amplitudes of these signals are measured, and the transducers 1 and 2 are moved to the area of the welding joint 3 on both sides. Here, signals are also excited and passed through the welded joint zone. Then, additionally one of the transducers excites and receives ultrasonic signals reflected from the structure of the welded joint. The amplitudes of the signals received from the base material of the product are compared with the amplitudes of the signals I passing through the welded joint zone, with the amplitudes of the signals about (Their reflection from its structure, find their amplitude difference and determine the desired parameter by its magnitude. 1 fig. To 00 about ate 1pc O5

Description

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The invention relates to non-destructive tools and methods of control and can be used for ultrasonic testing of welded joints obtained by resistance welding.

The aim of the invention is to increase the reliability of control by detecting sticking defects.

The drawing shows a diagram of the implementation of the method of ultrasonic testing of welded joints obtained by resistance welding.

The drawing shows two ultrasonic transducers: a transmitter 1 and a receiver 2 mounted on a product 3, in which a welded joint 4 is obtained,

The method of ultr13Buk control is carried out as follows.

Transducers 1 and 2 are mounted on product 3 outside the welded joint zone 4 at a position corresponding to the maximum amplitude of the received ultrasonic signals reflected from the bottom surface of the product. The amplitudes of the received signals are moved and the transducers 1 and 2 fixed between themselves are moved to the weld zone. 3, setting them on both sides towards each other, Excite ultrasonic vibrations with transducer 1, receive transducer 2 signals passing through the welded joint zone and reflected e, from the bottom surface of the product. The level of these signals will depend on the structure of the welded joint 4 and in the case of formation.

for example, a fine-grained structure will differ slightly from signals received from the base material.

Further, they additionally send and register with one of the converters 1 or 2, working in a combination. Compiled by N. Slyusarenko Editor A. Dolinich Tehred L, Oleinik Proofreader I. Erdeyi

Order 7061/49 Circulation 778 Subscription

VN1-1IPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/3

Production and printing company, Uzhgorod, st. Project, 4

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in the mode, amplnch uly signals, which are reflected from the structure of the cyt connection. The amplitudes of these signals are compared with the amplitudes of the signals excited in the base material, and the defect is determined from the difference obtained.

This difference will be greater, the smaller the ultrasonic wave reflected from the structure. Therefore, in the case of the presence of sticking defects characterized by the formation of a fine-grained structure in the welded joint zone, the difference between the amplitudes of these signals will be an order of magnitude larger than the difference between the amplitudes of the same signals in the coarse-grained structure of the welded joint in which defects such as sticking do not form .

The proposed method of ultrasonic testing of welded joints is increased. It ensures the reliability of the control and allows you to control the joints immediately after welding without subsequent heat treatment.

Claims (1)

Claims. The method of ultrasonic testing of welded joints, which excites ultrasonic oscillations in the area of the welding joint and in the main material of the product, measures the amplitudes of the received oscillations and determines the defect, which is different from their difference, in order to improve the reliability control by detecting sticking defects, additionally receiving and recording the amplitudes of the signals, aows, back-reflected from the structure of the welded joint, are compared with the amplitudes of the signals received from the base material and from the difference obtained, a controlled parameter is determined.