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Radiographic inspection of steel pipe welds is where X-rays directly penetrate the weld material and produce suitable images on radiographic inspection films or digital imaging media. The blackness of the radiographic film is not less than 2.0 (the blackness of the weld is not less than 1.5); X-rays use an image quality meter specified by ISO. The image quality meter is selected corresponding to the thickness of the transillumination. The sensitivity of the X-ray film is better than 2%. The dynamic sensitivity of industrial TV is better than 4%.
X-ray detection technical requirements:
(1) The evaluation room should be clean, quiet, with a suitable temperature, and the light should be dark and soft.
(2) The testing environment must maintain a certain temperature and humidity.
(3) In order to ensure the quality of the film, it is necessary to strictly follow the requirements to ensure the quality of development and fixing work as well as the quality and validity period of the film.
(4) Darkroom safety exposure should be determined regularly.
Applications of X-ray Inspection
X-ray inspection of steel pipe welds is mainly aimed at the volume defects of steel pipes produced during the welding process, such as defects such as lack of fusion, beads, pores, cracks, incomplete welding, and tungsten inclusions.
The main advantages of X-ray detection technology:
①The size and shape of the defect can be directly seen from the film results;
②The test results can be stored for a long time through the film;
③ It is most suitable for detecting volumetric defects, that is, detecting defects with large radiation energy attenuation, or defects with a certain thickness, and comparing the defects through the blackness difference of the radiographic films.
However, the cost of radiographic inspection is high. The radiographic films inspected are disposable and cannot be reused. Area defects are limited by directionality. Since radiographic flaw detection contains radiation, for the safety of workers, safety protection measures must be taken into consideration during work.
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