Radiographic testing method for welding quality of brazed pipe welds

Abstract

The invention belongs to the technical field of non-destructive testing, and in particular relates to a radiographic testing method for welding quality of brazed pipe welds. The method comprises the following steps: firstly, positioning welding is carried out on a brazed pipe sample; tangential transillumination is carried out on welds of a non-brazed pipe sample subjected to the positioning welding in the step 1, so that clear black lines can be seen on two sides of the welds, and a transillumination image at the welds at the moment is a first standard reference sample picture of unformed brazed welds; radiographic transillumination is carried out on brazed welds according to transillumination parameters in the step 2 and a radiographic testing image of the brazed welds is obtained; then a sample with black line display in the welds in the step 3 is selected to test the quality of the welds, and a sample picture of a qualified sample of which the weld quality test meets the lowest qualified standard is selected as a second standard reference sample picture; finally, radiographic testing is carried out on the welds of parts according to the transillumination parameters in the step 2, and the radiographic testing image is compared with the first standard reference sample picture and the second standard reference sample picture to check and accept the parts. The method disclosed by the invention is fast, high-efficient and low-cost.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of non-destructive testing, in particular to a radiographic testing method for welding quality of brazed pipe welds. [0003] 【Background technique】 [0004] The pipe is the main part of the engine pipeline, and the sealing performance and internal quality of the pipe weld are directly related to the performance and quality of the engine. The pipeline part of the new type of aero-engine adopts the vacuum brazing manufacturing process, and the density of the brazing material is lower than that of the base metal. The conventional method of inspecting the brazing seam cannot find the unbrazed defects in this type of brazing seam. In order to ensure product quality and detection reliability, it is urgent to develop a new detection method to meet the feasibility and reliability of this type of weld radiographic detection. [0005] Radiographic inspection is an important means for the internal structure a...

AI Technical Summary

Problems solved by technology

[0005] Radiographic inspection is an important means for the internal structure and defects of parts. When conventional X-ray photography is used to detect brazed joints whose solder density is less than or equal to that of the base metal, due to the small contrast of defects, it is often impossible to obtain defects on the film. The image shows that it cannot be detected by conventional radiographic detection methods

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