Radiographic Testing (RT)
Radiographic testing uses ionizing X-rays to image internal flaws like pores or cracks in weld metal. The rays pass through the workpiece and are absorbed differently by densities, appearing as contrast on film or digital detectors.
Physical-Chemical Mechanism of Action
X-rays consist of high-energy photons that travel through matter, knocking electrons out of atoms. The density of the material determines how many rays are absorbed. Denser materials absorb more rays than lighter ones.
Metallurgical Relevance & Risks in Welding
Radiographic testing is an important tool for quality control of weld metal. It allows internal flaws such as pores, cracks, or deformations to be detected that visual inspection methods cannot see. However, misinterpreted images or insufficient radiation intensity can lead to misunderstandings and false conclusions about material quality.
Workshop Practice & Action Guidelines
For accurate radiographic testing, it is important that the workpiece is placed in the correct orientation and that the radiation intensity and exposure time are set correctly. The radiation intensity should be high enough to produce sharp images, but not so high that the material is overexposed. Insufficient radiation intensity leads to blurry images, while too high intensity may damage the workpiece.