How many shots are required to RT a splice weld in a rectangular hollow structural section with no access to the inside?

In assessing the number of shots required for radiographic testing (RT) of a splice weld in a rectangular hollow structural section with limited access, it is important to consider the geometry of the section and the weld location.

For a splice weld in a rectangular hollow structural section, typically, the weld will be situated around the entire perimeter of the joint. Because there is no access to the inside of the section, radiographic testing must be performed on the outside surfaces.

To ensure that the entire weld area is adequately inspected, three shots are often necessary. The first shot typically captures one side of the weld, while the second shot captures the other side. The third shot might be needed to cover an area of the weld that may not be visible from the first two shots.

Hence, requiring three shots is justified as it provides a comprehensive view of the weld integrity throughout the splice, ensuring that any potential defects that could compromise the structural integrity are identified. This thorough approach is standard practice in non-destructive testing protocols for welded structures, particularly when the access is constrained.