Which type of welding inspection utilizes gamma rays to detect microcracks in welds?

Radiographic inspection is a method that utilizes gamma rays or X-rays to assess the integrity of welds by producing an image of the internal structure of the weld and the material surrounding it. This technique is particularly adept at detecting internal flaws such as microcracks, voids, and inclusions that are not visible from the surface. The high penetrating power of gamma rays allows for the examination of thick materials, making this method suitable in various industries where weld quality is critical, such as in pipelines, aerospace, and construction.

Ultrasonic inspection relies on high-frequency sound waves to detect inconsistencies within materials, while magnetic particle inspection is used for identifying surface and near-surface defects in ferromagnetic materials. Visual inspection, though fundamental, is limited to surface flaws and does not provide any insights into subsurface issues. The choice of radiographic inspection for detecting microcracks is grounded in its ability to reveal hidden defects that could lead to structural failures if left unchecked.