ML20133G379
| ML20133G379 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 09/29/1981 |
| From: | Toth A NRC |
| To: | Narbut P NRC |
| Shared Package | |
| ML20133G373 | List: |
| References | |
| FOIA-85-35 NUDOCS 8508080657 | |
| Download: ML20133G379 (2) | |
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't It is Bechtel's position that no further action is required on previously completed welds which incorporated tack welds.
The 'following is support for the above position:
AWS D1.1-77 requires that tack welds be made with a qualified /prequalified WPS by qualified welders and meet the same quality requirements as the final weld (i.e., all discontinuities within acceptable limits).
In regard to these requirements, a tack weld is no different than any other weld pass which is incorporated into the completed ' weld.
UMSI General Welding Standara regards that tack welds be made in accor-dance with an approved (qualified /prequalified) WPS.
UNSI's weld filler material control program limits issuance of weld filler material to qualified welders. The qualification test given all qualified welders are specially devised tests to determine the welder's ability to produce sound welds.
These qualification tests are performed in accordance with a weld procedure specification that encompasses both welds and tack welds.
These tests are conducted and visually inspected by supervision who determine the welders ability to produce and recognize sound welds.
Therefore a welder is cognizant of weld quality whether it is a tack weld, a fill bead or the cover pass of the weld.
Thorafere, tack welds which were incorporated meet the requirements of AWS.
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