Field weld (site weld)
Applied to joint
Supplementary symbol applied to fillet weld
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Description
A supplementary symbol (filled flag or triangle at the junction of arrow and reference line) indicating that the weld is to be made at the installation site (in the field) rather than in the fabrication workshop. Affects WPS, inspection, and environmental controls.
In plain English
A filled flag at the elbow where the arrow meets the reference line means 'this weld is done on site, not in the shop'. This matters because site welding conditions are usually worse than shop conditions -- wind, rain, awkward positions, no positioners. It tells the inspector that different acceptance criteria or environmental controls might apply. It also tells the planner that this joint cannot be welded until the structure is erected on site. The flag points away from the arrow.
Symbol position
Filled flag/triangle at the junction of arrow and reference line, pointing away from the arrow.
Size notation
No additional dimension. The flag simply indicates field/site welding.
Common uses
- Structural steel erection connections (beam splices, column splices)
- Pipeline tie-in welds
- On-site pressure vessel and tank connections
- Bridge erection joints
