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Welding Symbols Designated as Typical
The duplication of identical welding symbols on a drawing may be avoided by designating a single welding symbol as “TYPICAL” (abbreviated as “TYP”) and pointing the arrow to the representative joint. The drafter shall provide additional information to completely identify all applicable joints.
The “TYPICAL” designation is intended as an alternative to repeating identical welding symbols many times on the same drawing, but only when the joints represented are identical in all details. The TYP is added to the tail of the welding symbol, and all applicable joints must be completely identified, e.g., “TYP at four stiffeners.”
Misuse of the “TYPICAL” designation has caused many cases of confusion and fabrication mistakes by failing to completely identify all applicable joints, or by identifying joints that may be similar but not identical. If more extensive information is required, it may be stated in a separate drawing note with a reference in the tail of the welding symbol.
Ahern employees average 13 years of industry experience. We fabricate and ship piping according to project-specific priorities, and we assist in all aspects of system layout, including budget planning and takeoff preparations. Ahern offers pipe fabrication services and also provides welded piping systems for a variety of systems
Reference: AWS A2.4:2007 Standard Symbols for Welding, Brazing, and Nondestructive Examination