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

A technology for butt welds and power transmission lines. It is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids. It can solve the problems of environmental pollution, high cost, personal injury, etc., and achieve high detection sensitivity, high work efficiency and convenient operation. Effect

Inactive Publication Date: 2010-08-04
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 miss...

Method used

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

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Embodiment Construction

[0029] The preferred embodiment of the present invention is described in more detail below with reference to the accompanying drawings of the present invention.

[0030] 1. Preparation before ultrasonic testing

[0031] (1) Clarify the calibration of weldment material, specification, welding process, heat treatment, groove type and center position of welded joint;

[0032] (2) The surface quality and appearance dimensions of welded joints shall pass the inspection;

[0033] (3) The steel pipe side of the welded joint should remove spatter, rust, oxide and oil, and the surface should be polished smooth, with a grinding width of 30mm;

[0034] (4) For the base metal on both sides of the welded joint, the thickness of the pipe wall should be measured before ultrasonic testing, at least every 90. measure a little;

[0035] (5) The coupling agent has good wetting ability and sound permeability, and uses machine oil or water-based cellulose derivatives;

[0036] (6) The selected...

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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...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 徐德录池永斌常建伟包乐庆张东英张磊王慧
Owner CHINA ELECTRIC POWER RES INST
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