CN114324574A - Ultrasonic discrimination method for internal defects of metal forging - Google Patents

Abstract

The invention discloses an ultrasonic discrimination method for internal defects of a metal forging, which is characterized in that a high-frequency narrow pulse probe is used, a defect reflected wave has a double-peak display property, the defect is determined to have a certain thickness, the defect is determined qualitatively, and the discrimination accuracy is improved. The method is suitable for ultrasonic judgment of the inclusions.

Description

Ultrasonic discrimination method for internal defects of metal forging

Technical Field

The invention relates to a method for distinguishing internal defects of a metal forging, in particular to an ultrasonic wave method for distinguishing the internal defects of the metal forging.

Background

Ultrasonic testing is a non-destructive testing technique and cannot cause any damage to the service performance of the tested object. If a defect exists in the workpiece, the defect is hidden in the workpiece, the defect cannot be subjected to exposure inspection, and the defect property cannot be judged. The existing ultrasonic flaw detector has filtering waveform and radio frequency waveform display, can observe the radio frequency waveform form of a display signal, has adjustable display range, can display shorter ultrasonic wave propagation time (namely propagation distance), has shorter ultrasonic pulse duration of a narrow pulse probe, and can distinguish two ultrasonic signals with shorter distance.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the ultrasonic discrimination method for the internal defects of the metal forging is characterized by comprising the following steps:

the inclusions in the material generally have a certain thickness, and can form a front interface and a rear interface with the base material, the inclusions are tightly combined with the base, the ultrasonic wave can be reflected and transmitted at the front interface, the transmitted wave can be reflected at the rear interface, and the reflected waves at the front interface and the rear interface can be received by the probe and displayed through the instrument display screen. By utilizing the characteristic of short pulse duration of the narrow pulse ultrasonic probe, two ultrasonic signals with small interval distance can be displayed by expanding the display range of the instrument;

the radio frequency waveform can display the highest peak value of the signal, and the defect is judged to have certain thickness by judging whether the peak values of the radio frequency signal of the front interface and the rear interface of the defect can be distinguished, so that the defect property is judged.

Compared with the prior art, the invention has the following beneficial effects:

the ultrasonic discrimination method for the internal defects of the metal forging, disclosed by the invention, has the advantages that the high-frequency narrow pulse probe is used, the reflected wave of the defects has the double-peak display property, the defects are judged to have certain thickness, the defects are qualitatively determined, and the discrimination accuracy is improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a radio frequency display of a non-notch;

figure 2 is a radio frequency display of an inclusion notch.

Detailed Description

The invention relates to an ultrasonic discrimination method for internal defects of a metal forging, which has the following specific implementation mode:

the inclusions in the material generally have a certain thickness, and can form a front interface and a rear interface with the base material, the inclusions are tightly combined with the base, the ultrasonic wave can be reflected and transmitted at the front interface, the transmitted wave can be reflected at the rear interface, and the reflected waves at the front interface and the rear interface can be received by the probe and displayed through the instrument display screen. By utilizing the characteristic of short pulse duration of the narrow pulse ultrasonic probe, two ultrasonic signals with small interval distance can be displayed by expanding the display range of the instrument;

the radio frequency waveform can display the highest peak value of the signal, and the defect is judged to have certain thickness by judging whether the peak values of the radio frequency signal of the front interface and the rear interface of the defect can be distinguished, so that the defect property is judged.

Claims (1)

1. An ultrasonic discrimination method for internal defects of a metal forging is characterized in that: the method comprises the following steps:

the inclusions in the material generally have a certain thickness, and can form a front interface and a rear interface with the base material, the inclusions are tightly combined with the base, the ultrasonic wave can be reflected and transmitted at the front interface, the transmitted wave can be reflected at the rear interface, and the reflected waves at the front interface and the rear interface can be received by the probe and displayed through the instrument display screen. By utilizing the characteristic of short pulse duration of the narrow pulse ultrasonic probe, two ultrasonic signals with small interval distance can be displayed by expanding the display range of the instrument;

the radio frequency waveform can display the highest peak value of the signal, and the defect is judged to have certain thickness by judging whether the peak values of the radio frequency signal of the front interface and the rear interface of the defect can be distinguished, so that the defect property is judged.

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