Inspecting very small diameter welded piping requires a highly flexible borescope. Welded sections of sanitary piping or other high purity piping requires a borescope that can make the sharp bends, look at the wall and rotate 360° to view entire welds. A side view borescope should normal be used. Although a forward view borescope with a wide field can be used, but the detail is not as good, and some of the weld can be shadowed depending on the shape of the weld bead.
AIT now offers the super-flex scope which has a range of centering tools that can be added to the tip to maintain alignment in the pipe and focus distance to the weld. These small diaper and highly flexible borescopes can inspect 1/4”Ø pipe to 4”Ø pipe. Standard diameters are 2mm, 4mm, 6mm and 9mm. The 9mm diameter is built with sheathing that is stiffer than the 2mm, 4mm and 6mm diameters. This allows it to be pushed into larger piping.