A method for ultrasonic flaw detection of steel structure welds

Abstract

The invention provides a method for ultrasonic flaw detection of a welding line of a steel structure. The method comprises the steps that (1) a flaw detection coupling agent A which comprises, by weight, 40 to 55 parts of ethylene glycol, 25 to 35 parts of glycerin, 10 to 15 parts of epoxy resin, 1 to 3 parts of versamid with molecular weight of 200 to 300, 0.5 to 2 parts of trimethylolpropane and50 to 65 parts of water is prepared; (2) a flaw detection coupling agent B which comprises, by weight, 25 to 30 parts of xanthan gum, 0.5 to 2 parts of sodium alginate and 40 to 60 parts of water isprepared; (3) a layer of flaw detection coupling agent A is sprayed on the surface of the welding line of the steel structural member, wherein the spraying thickness is 1 to 2mm; standing for 60 to 90s is carried out to acquire the steel structural member containing a precoated layer; and (4) the surface of the welding line of the steel structural member containing the precoated layer is sprayed with a layer of flaw detection coupling agent B, wherein the spraying thickness is 1 to 3 mm; a welding line ultrasonic flaw detector is used to carry out ultrasonic flaw detection on the surface of the welding line of the steel structural member; the position information of the flaw of the welding line is recorded in real time. The method for ultrasonic flaw detection of the welding line of the steel structure, which is provided by the invention, can effectively optimize flaw detection at a contact surface with low flatness and in low temperature environment.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of steel structures, in particular to an ultrasonic flaw detection method for weld seams of steel structures. Background technique [0002] Welding seam connection and bolt connection are two main ways of connecting steel structure engineering components. Among them, welding seam connection has the largest workload in the construction of steel structure, and is also the most prone to problems. How to ensure the quality of welded seam connection has a great impact on Effective inspection of welding construction is the top priority of quality control of steel structure engineering. At present, the methods used for non-destructive testing of steel structures mainly include: eddy current testing, penetrant testing, radiographic testing, ultrasonic testing, ferromagnetic particle testing, and ultrasonic testing is the most common in practical application projects. [0003] The existing...

AI Technical Summary

Problems solved by technology

The current couplant is mainly based on engine oil, transformer oil, grease, glycerin, water glass or industrial glue, chemical paste, etc.; when the flatness of the contact surface is not uniform, it is impossible to fill the uneven pits while ensuring a high Lubricity and wettability, easy to wear, serious loss of coupling agent, large coupling loss, and reduced sound energy transmittance; in addition, when used in a low temperature environment, the low temperature resistance effect is insufficient, and it is easily affected by temperature and easily produces A large number of solids precipitate and condense, which leads to the problem of greatly reducing the detection results. Therefore, in the process of ultrasonic flaw detection of steel structure welds, it is still impossible to achieve accurate and effective ultrasonic testing of steel structures with different flatness and different environments. Flaw detection

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