Ultrasonic testing method for butt-jointed seam of steel tube tower in electric transmission line

Abstract

The invention provides an ultrasonic testing method for a butt-jointed seam of a steel tube tower in an electric transmission line, which belongs to the technical field of nondestructive testing of butt-jointed seams. The method comprises the following steps: the probe connected with an ultrasonic tester is put at the side end of the steel tube with the butt-jointed seam, wherein the probe tallies with the outside diameter of the steel tube; and when the ultrasonic tester sends out a signal, the probe emits ultrasonic waves to cover the entire butt-jointed seam to carry out ultrasonic creeping wave testing, thereby analyzing the defects of the butt-jointed seam. The testing method of the invention can realize three-dimensional scanning, and has the advantages of convenient operation, easy mastering, high work efficiency and high testing sensitivity.

Description

technical field [0001] The invention relates to a non-destructive detection technology of welds, in particular to an ultrasonic detection method for butt welds of steel pipe towers of transmission lines. Background technique [0002] In recent years, with the rapid development of my country's national economy, in order to achieve the goal of "resource-saving and environment-friendly" transmission line construction, steel pipe towers have been used in UHV double-circuit transmission lines on the same tower and multi-circuit transmission lines on the same tower. Nearly 60% of the steel pipes in the steel pipe tower have a thickness of less than or equal to 8mm, and the connection between the thin-walled steel pipes and the flanges is in the form of butt welding. This weld is a first-class weld and requires 100% non-destructive testing. [0003] At present, domestic technical regulations are still blank for ultrasonic testing of butt girth welds and longitudinal welds of thin-wa...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the relatively small curvature radius of the steel pipe, the position of ray transillumination is limited (for a weld joint of Φ159mm, considering the detection angle of transverse cracks, the X-ray transillumination is at least 8 times), and the production efficiency of the weld joint inspection is low ;

[0005] 2) Radiographic transillumination is not sensitive to linear defects such as cracks and unfused, resulting in missed detection of many harmful defects;

[0006] 3) X-rays or γ-rays are generally used for X-ray detection, which will harm people and pollute the environment. It is necessary to obtain a radiation permit qualification certificate from the relevant government department

[0007] 4) High cost and long testing and evaluation time

Generally, it takes 2 hours to detect a φ273mm butt girth weld, and the subsequent washing, drying and evaluation takes longer

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