Double X-ray negative film radiographing method

Abstract

The invention relates to a double X-ray negative film radiographing method, and belongs to the technical field of nondestructive inspection. The method comprises the steps that two X-ray negative films are overlapped on the back surface of a workpiece, the allowance range of light exposure can be enlarged, by means of three combination modes of the two X-ray negative films, images capable of conducting evaluation on defects can always be selected out, and special adjustment does not need to be conducted on the light exposure even through the wall thickness of the workpiece is changed greatly. Therefore, waste films produced in the shooting process are significantly reduced, particularly, the defects which are difficult to capture through a single X-ray negative film can be found by means of sensitization of the overlapped X-ray negative films, the defect detection percentage is effectively increased, and the radiographic inspection quality of workpieces is effectively improved.

Description

technical field [0001] The invention relates to a photographic method, in particular to a radiographic method with double X-ray film, and belongs to the technical field of nondestructive flaw detection. Background technique [0002] Radiography is widely used in non-destructive testing of castings and forgings, sheet metal parts, steel pipe welds and other products. Traditional radiography has always used a single X-ray film, which is suitable for radiographic flaw detection of products with relatively uniform wall thickness. However, when inspecting products with large wall thickness changes, such as castings with large wall thickness differences, it is difficult to control the appropriate exposure, which often leads to unqualified blackness of X-ray negatives and waste films. [0003] Practice has shown that the use of traditional radiographic flaw detection to detect products with large differences in wall thickness has a high scrap rate, which not only increases the cos...

AI Technical Summary

Problems solved by technology

However, when inspecting products with large wall thickness variations, such as castings with large wall thickness differences, it is difficult to control the appropriate exposure, which often leads to unqualified blackness of X-ray negatives and waste films

[0003] Practice has shown that the use of traditional radiographic testing to detect products with large differences in wall thickness has a high scrap rate, which not only increases the cost, but also greatly reduces the detection efficiency of radiographic testing

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