Double-channel probe adjusting mechanism and double-channel probe water immersion high-frequency ultrasonic flaw detection method

Abstract

The invention relates to a double-channel probe adjusting mechanism and a double-channel probe water immersion high-frequency ultrasonic flaw detection method, and belongs to the technical field of steel flaw detection equipment. The mechanism comprises a first probe frame and a second probe frame, wherein the first probe frame is fixed on a module, and the second probe frame is movably connectedwith the module through a micro-adjustment mechanism and used for micro-adjusting the horizontal rotation angle of the second probe frame; the bottoms of the first probe frame and the second probe frame are respectively movably connected with a corresponding first clamping port and a corresponding second clamping port through a horizontal adjusting mechanism, the first clamping port is used for arranging a first probe, and the second clamping port is used for arranging a second probe. The double-channel probe water immersion high-frequency ultrasonic flaw detection method performs positioninganalysis on the defects by using a test method for synchronously detecting the internal macroscopic defects in the steel by using two probes with different frequencies, and evaluates the internal macroscopic purity of the steel; and the partition detection of a sample to be detected is synchronously realized, the detection blind area of the sample is reduced, the detection accuracy is improved, and the comprehensive and rapid evaluation of the purity of the interior of the steel is facilitated.

Description

technical field [0001] The invention relates to a dual-channel probe adjustment mechanism and a dual-channel probe water immersion high-frequency ultrasonic flaw detection method, belonging to the technical field of steel flaw detection equipment. Background technique [0002] With the continuous improvement of customers' requirements for steel quality, the purity of steel as an important indicator of steel quality is getting higher and higher. Therefore, the control and detection of internal macroscopic and microscopic defect sizes in steel has become a key work content for metallurgical scientists and inspectors. [0003] There are many non-destructive testing methods for testing the macroscopic purity of steel. Ultrasonic testing of steel is a more commonly used method for testing steel quality. Compared with other testing methods, ultrasonic testing has many advantages, such as: it can It is tested under the premise of no pollution, no harm to human body, more accurate ...

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Problems solved by technology

However, the signal strength of water immersion ultrasonic testing is very weak, and it is often necessary to adjust the gain of the attenuator to a high level to find the defect echo in the workpiece. According to experimental research, when using the same frequency probe, the signal strength of water immersion ultrasonic testing The signal strength difference with the water grinding method is about 20dB

Therefore, in water immersion testing, focusing probes are generally used to increase the signal strength. Although this method can increase the signal strength to a certain extent, the actual detection effect is not very ideal due to the uneven distribution of the sound beam of the focusing probe, and multiple flaw detections are required. The defect parameters of the steel are detected, which greatly wastes the detection time and reduces the detection efficiency

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