What does a solid backwards flag on a pole indicate when associated with a square weld symbol?

A solid backwards flag on a pole in welding terminology signifies a field weld. This symbol indicates that the weld is to be completed at the job site rather than in a fabrication shop. Field welding typically occurs when components are assembled on-site, requiring joints to be welded after all pieces are positioned in their final arrangement.

When a square weld symbol is used alongside this indication, it clearly communicates to the welder that they should prepare to execute the weld under field conditions. Understanding this is crucial for contractors and welders as it informs them of the necessary preparations needed for mobility, access, and potentially, adverse weather conditions which might affect the welding process at the job site.