Leakage detecting agent for detecting leakage of weld joint in welding process and detection method

Abstract

The invention relates to a leakage detecting agent for detecting the leakage of a weld joint in the welding process and a detection method, and is suitable for leakage detection of the weld joint, with a sealing requirement, in a pipeline, a tank body and a transformer structural member. The technical scheme is as follows: the leakage detecting agent comprises a photographic developer and a penetrating agent, wherein the photographic developer refers to a turbid liquid prepared by stirring chalk powder and industrial alcohol; the penetrating agent comprises dimethylbenzene, butanol and red oil-soluble dye through mixing. The photographic developer is coated on one surface of the weld joint through welding, the penetrating agent is coated and brushed on an unwelded part of the back surface of the weld joint after being dried, and a red spot-shaped trace is observed from the surface of the photographic developer, namely, a leakage point exists in the position. According to the leakage detecting agent and the detection method, the problems of complicated operation process of postwelding pressure leakage testing, overlong fluorescent penetrating inspection leakage detection time and low efficiency are solved. The leakage detecting agent is applied to the practice, is convenient to configure, easy to operate and high in efficiency; the photographic developer is easily wiped, and the penetrating agent automatically volatilizes without residues, and thus no influences on subsequent welding, post-treatment operation and product quality are caused.

Description

technical field [0001] The invention relates to a leak detection agent and a detection method for detecting weld seam leakage during the welding process, which is suitable for leak detection of weld seam with sealing requirements in pipelines, tanks and transformer structural parts. Background technique [0002] For welds with sealing requirements in pipelines, tanks and transformer structural parts, in general, two methods are used to detect leaks in order to detect the tightness of welds. One is air pressure leak detection, that is, the product is sealed after the overall welding is completed. In order to close the cavity, then fill the cavity with compressed air, brush the foam leak test liquid on the weld position after reaching a certain pressure, if the weld continuously appears foam, it means that there is a leak point in the weld at this position; the second is to use fluorescent Penetration method for weld leak detection. However, leak detection after welding is a ...

AI Technical Summary

Problems solved by technology

However, leak detection after welding is a remedial measure and requires a separate process. Although the method of fluorescent flaw detection is a detection method in the welding process, it takes at least 8 hours, and the fluorescent penetrant itself is oily leak detection. Finally, it is necessary to use the grill to volatilize the oil on the surface of the weld before welding

The above leak detection methods have the disadvantages of labor-intensive and time-consuming operation and low efficiency.