Thanks for the replys,
The code D1.2:2008 doesn't directly say STAMP, But identification of the welders is.
Clause 3 -- 3.17
Identification of Welders, Welding Operators, and Tack Welders.
Each qualified Welder, Welding Operator, and Tack Welder shall be assigned an identifying number, letter, or symbol by the Contractor, Fabricator, or Manufacturer, which shall be used to identify the work of that person.
Weld maps help in identifying the locaton of suspect defect, but when we are mass welding by multiple welders on identical weldments,typically the welder ID stamp is part of our internal or customer traceability production control process. Additionally it makes good sense because when an issue is discovered it makes quarantine of the suspect welder’s product much easier to segregate. An example is during weld cell audits if I or the external auditor were to find a welder using the wrong shielding gas or out of range of any WPS parameter we can quarantine their product back to the last acceptable audit or process inspection documented, until determination can be made for rejection, use as is, or EOR deviation.