Field Weld Symbol
The field weld flag indicates that the specified weld is to be made at the installation or field location rather than as a shop weld. It changes where the weld is made, not the elementary weld type.
- Recognize the field-weld flag at the arrow/reference-line junction
- Separate weld location from weld type
- Find the erection or site condition that controls when the weld is made
A correct icon is not yet a correct decision.
A field flag changes where the operation happens, which affects access, sequencing, fit-up, weather controls, inspection, and cost—but it does not name the weld itself.
What each mark tells you—and what it does not.
Use the third column as a stop-check. It prevents a familiar mark from turning into an unsupported assumption.
| Visual cue | What it tells you | What you must still verify |
|---|---|---|
| Flag at arrow/reference junction | Weld is to be made in the field/site context | The flag does not define size, side, or process. |
| Elementary symbol on the line | The actual weld type | Decode it independently from the location flag. |
| Tail or referenced note | May supply site procedure or specification information | Confirm project-specific field conditions. |
A fillet weld carries a flag at the junction
The assembly drawing includes shop-fabricated members that will be joined after erection.
Read the triangle as the fillet type and the flag as a field-location requirement. Then find erection notes, access constraints, and any site-specific procedure requirements.
The weld is not completed prematurely in the shop or mistaken for a different weld family.
How to read it without guessing
Find the flag at the junction of the arrow and reference line, then continue reading the elementary weld symbol, side, dimensions, and tail as normal.
- Locate the flag at the arrow/reference-line junction.
- Identify the joint and side significance.
- Read the elementary weld symbol and dimensions.
- Check erection, site, access, and procedure notes that govern field work.
Similar-looking instructions, different fabrication decisions
Field-weld flag
Controls location of welding
DECIDING CHECKIs the flag attached at the arrow/reference junction?Weld-all-around circle
Controls extent around the joint
DECIDING CHECKA circle is not a location instruction.Three mistakes that change the instruction
Modifier versus weld type
The flag answers where. The elementary symbol answers what.
Temporary-work assumption
Field location does not imply temporary status; the complete drawing and specification define permanence and acceptance.
Missing field constraints
Access, sequence, weather protection, inspection, and WPS requirements may appear elsewhere in project documents.
Field Weld practice
Skill: supplementary symbols
What question does the field-weld flag answer?
Five checks for this symbol
This is a drawing-reading checklist, not an acceptance standard. Use it before fabrication, fit-up, inspection, or answering a test question.
- 01Identify the base weld type
- 02Confirm the field flag
- 03Read side and dimensions
- 04Find erection/site notes
- 05Verify access, procedure, and inspection plan
Standards and editorial basis
This guide teaches common AWS-style drawing interpretation. It is educational material, not a substitute for the purchased standard, project specification, code, WPS, or qualified engineering direction.
Editorial method. Original training diagrams, worked decisions, misconception checks, and questions are written for learning—not copied from a standards table. Production interpretation must still follow the governing documents.
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Related symbol guides
Symbol Anatomy
Fillet Weld
Weld All AroundEducational practice only. Verify production work against the governing drawing, applicable standard, WPS, and qualified instruction.