Magneto-optical imaging detection method and magneto-optical imaging detection device for weld microstructure

Abstract

The invention discloses a magneto-optical imaging detection method and a magneto-optical imaging detection device for a weld microstructure. The method comprises the following steps: exciting a weld of a weldment; collecting a magneto-optical image of the excited weld; and analyzing the magneto-optical image by adopting an image analysis method so as to obtain distribution information of the weld microstructure. Since heating and rapid cooling conditions in different area of the weld are inconsistent in the process of welding the weldment, the microstructure of the welded weld is divided into a base metal zone, a weld zone and a heat affected zone; and when because the distribution conditions of an induced magnetic field are reflected by the magneto-optical image, the excited weld is subjected to magneto-optical image collection, and the specific distribution information of the microstructure in each area of the weld can be obtained by analyzing the magneto-optical image of the weld. According to the method disclosed by the invention, the integrity of the weldment in the using process is maintained, the operation is simple, and the detection efficiency is improved to a certain degree.

Description

technical field [0001] The invention relates to the technical field of weld microstructure detection, in particular to a magneto-optical imaging detection method for weld microstructure. The invention also relates to a magneto-optical imaging detection device for weld seam microstructure. Background technique [0002] With the development of the manufacturing industry, the application of metal materials is becoming more and more extensive. Usually, metal materials need to be welded. The quality of the weld of the material after welding is the key to the whole welding. The distribution of the type microstructure has a great influence on the performance of the weldment. Therefore, it is necessary to detect the microstructure of the weld in order to obtain the distribution of various microstructures, so as to provide a basis for the performance judgment of the weldment. [0003] At present, the traditional weld microstructure detection method adopts the metallographic microst...

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Problems solved by technology

[0003] At present, the traditional weld microstructure detection method adopts the metallographic microstructure analysis method, that is, the method of observing the weld microstructure after metallographic sample preparation with a microscope (optical microscopy or electron microscopy). , before using this method to detect the microstructure of the weld, the weldment needs to be cut, ground, polished and corroded (that is, metallographic sample preparation), which increases the complexity of the entire detection process, and in In the process of metallographic sample preparation, the requirements for operators are high, and the integrity of the weldment is destroyed by cutting the weldment

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