Bridge steel structure welding seam detection method

Abstract

The invention discloses a bridge steel structure welding seam detection method. The method comprises the following steps that: S1, a detector firstly removes dirt at a position needing to be detected, then visually recognizes a welding seam by naked eyes, and if necessary, whether defects such as undercuts, craters, weld beading, slag inclusion, cracks, air holes, incomplete welding and the like exist or not is checked by using a magnifying lens with a magnification factor ranging from 5 to 20; S2, the detector marks bridge steel structures needing to be subjected to welding seam ultrasonic detection one by one by using a mark sticker, and the detector marks the bridge steel structures with obvious unqualified appearances in an emphasized manner while marking the bridge steel structures needing to be subjected to welding seam ultrasonic detection; S3, a coupling agent with good sound transmission performance is selected and smeared to the welding seams of the bridge steel structures needing to be detected; S4, a pulse reflection type ultrasonic detection instrument is adopted, the scanning speed of a probe of the detection instrument is not larger than 150 mm / s, and two adjacent scanning at least needs 10% of overlapping of the width of a probe wafer. According to the ridge steel structure welding seam detection method of the invention, the detection of the welding seams of the bridge steel structures are more accurate and rapid.

Description

technical field [0001] The invention belongs to the technical field of bridge detection, in particular to a method for detecting weld seams of bridge steel structures. Background technique [0002] In the manufacture of bridge steel structures, due to the limitation of the steel material itself, it is necessary to splice beams to form welds in the process of building bridges. This type of joint has poor reliability and is a joint with severe stress concentration. After a long period of fatigue stress The impact will cause fatigue fracture, which will seriously affect the welding quality and engineering safety of the bridge. At present, the quality of bridge steel structure welds is controlled by means of radiographic inspection, but radiographic inspection is difficult to determine the position and height of defects in the vertical direction. At the same time, the operation steps are cumbersome, the efficiency is very low, and the waste liquid in the washing process pollutes...

AI Technical Summary

Problems solved by technology

[0002] In the manufacture of bridge steel structures, due to the limitation of the steel material itself, it is necessary to splice beams to form welds in the process of building bridges. This type of joint has poor reliability and is a joint with severe stress concentration. After a long period of fatigue stress The impact will cause fatigue fracture, which will seriously affect the welding quality and engineering safety of the bridge.

At present, the quality of bridge steel structure welds is controlled by means of radiographic inspection, but radiographic inspection is difficult to determine the position and height of defects in the vertical direction. At the same time, the operation steps are cumbersome, the efficiency is very low, and the waste liquid in the washing process pollutes the environment. Radiation protection work must be carried out during on-site detection operations, especially in densely populated urban areas, high altitudes and mountainous areas, where radiation detection conditions are not yet available

In addition, the radiation detection equipment is huge, inconvenient to operate, more consumables are used, and the detection cost is large