Phased array ultrasonic testing method for butt weld of TMCP steel plate

Abstract

The invention discloses a phased array ultrasonic testing method for a butt weld of a TMCP steel plate, and belongs to the technical field of non-destructive testing of a quality control system. A testing system of the butt weld of a TMCP steel plate with a wall thickness below 25mm is formed by a phased array ultrasonic detector, a phased array operating system, a high frequency linear array shear wave probe and a calibration test block to realize detection of welding defects of the butt weld. Due to the anisotropic characteristics of TMCP steel, when phased array ultrasonic wave is used to detect the butt weld, a special method is needed to calibrate the testing system and correct test results to achieve accurate detection. The phased array ultrasonic testing method just overcomes the above shortcomings, and the phased array ultrasonic testing method is high in on-site detection efficiency and accurate in results, and has good implementability.

Description

technical field [0001] The invention relates to a method for detecting the quality of a TMCP steel butt weld by using a phased array ultrasonic, which belongs to the field of ultrasonic nondestructive testing. Background technique [0002] TMCP steel products with a wall thickness less than or equal to 25mm are widely used in various fields. TMCP steel plates are generally connected by welding, and the quality of welding is directly related to the stability of the constructed structure. Due to the different planar harmful defects, such as cracks, incomplete penetration, and incomplete fusion, will be produced during the welding process, these defects will cause very serious consequences for the use of large ships, which may lead to breakage of the hull bracket and structural instability, etc. Wait. For this reason, testing after welding is a very important and rigorous technology. At this stage, non-destructive testing methods include ultrasonic, ray, magnetic particle, pen...

AI Technical Summary

Problems solved by technology

Due to the different planar harmful defects produced during the welding process, such as cracks, incomplete penetration, and incomplete fusion, these defects will cause very serious consequences for the use of large ships, which may lead to breakage of the hull bracket and structural instability, etc. Wait

For this reason, testing after welding is a very important and rigorous technology. At this stage, non-destructive testing methods include ultrasonic, ray, magnetic particle, penetration, eddy current, etc., and internal defects are generally detected by conventional ultrasonic and ray techniques: these The ray detection in the detection method is harmful to the human body, and it is not sensitive to very harmful cracks, unfused and other area-type defects, and it is easy to miss detection; the accuracy of conventional ultrasonic detection results is easily affected by the coupling conditions and the level of technicians , it is difficult to perform fast and accurate detection; methods such as magnetic particle, infiltration, and eddy current can only detect surface and near-surface defects, and the detection accuracy cannot meet the existing needs

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