What is Radiographic Testing?
Radiographic Testing (RT or X-ray or Gamma ray) is a non-destructive testing (NDT) method that examines the volume of a specimen. Radiography (X-ray) uses X-rays and gamma-rays to produce a radiograph of a specimen, showing any changes in thickness, defects (internal and external), and assembly details to ensure optimum quality in your operation.
RT usually is suitable for testing welded joints that can be accessed from both sides, with the exception of double-wall signal image techniques used on some pipe. Although this is a slow and expensive NDT method, it is a dependable way to detect porosity, inclusions, cracks, and voids in weld interiors.
RT makes use of X-rays or gamma rays. X-rays are produced by an X-ray tube, and gamma rays are produced by a radioactive isotope.
X-rays are produced by impacting an anode target with high-speed electrons under high vacuum conditions.Gamma rays are radioactive isotopes that are emitted during atomic transmutation.Both are electromagnetic waves with high penetration and short wavelength.Objects of different thicknesses need to be penetrated by rays of different energies,so different sources of radiation are used separately.For example,X-rays emitted by X-ray tubes (when the acceleration voltage of electrons is 400 kV),gamma rays generated by radioisotope 60Co and X-rays generated by a 20 MeV lin,the largest steel that can penetrate The thicknesses are approximately 90 mm, 230 mm and 600 mm, respectively.
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