What is the minimum number of RT shots required for small-diameter tubing?

The correct answer is based on the standards established by the Canadian Welding Bureau for the radiographic examination of welds in small-diameter tubing. In general, the minimum number of radiographic (RT) shots required for small-diameter tubing is set to ensure that the entire volume of the material is adequately inspected.

For small-diameter tubing, a minimum of two radiographs is necessary to provide sufficient coverage and ensure that any potential defects within the welds are detected. This is particularly important due to the geometry and the potential for discontinuities that may not be fully captured with a single exposure. Two radiographs taken at different angles or positions can help reveal imperfections that might be oriented differently with respect to the beam.

When considering the number of RT shots, industry standards prioritize safety and integrity, especially for critical applications. Using two exposures also allows for better image quality and viewing of defects, contributing to a comprehensive assessment of the weld quality in small-diameter tubing applications.