Dear Venkat,
AWS D-1.1 is the design basis for structures both for static loading and dynamic loading. Design with dynamic loading conditions are far more stringent than design with static loading conditions. For structural design a lot of design issues are left as the responsibility of the design engineer/authority(see the attachment).
If impact test is required it shall be specified in the the contract. Under such conditions impact is mandatory for procedure qualification (either as prequalified or newly qualified procedure).D-1.1 part-D provides a general overview of impact test requirements.
It is very difficult to provide one line solution to your query.However some of the requirements of impact tests are as follows:-
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Structures exposed to dynamic loading,including the offshore structures-- impact test is required, subject to the the minimum yield stress of steels.Higher the Y.S, more is the requirement for impact test.See Clause C-2.26 for details on impact test requirements for offshore structures.
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Structures generally exposed to static loading --e.g building, impact requirement is not mandatory, but subject to the building code and requirements for local jurisdictions. For building structure, located in earthquake zones and using high strength steels for design, impact test would be a design design requirement for base metals.
For rest of the structural welds designed to D-1.1, impact test may not be required, however again the local building code, local regulations all would apply.
In a nutshell,if the contract does not call for impact test on base metal, then impact test is not required for welding consumables and on procedure qualification.
Hope this casts some light on your query.
You may read the attachment for further information.
In Canada the code followed for design of structural steels is CSA-W-47.1. The design basis for this code and AWS D-1.1 have a lot of similarities.
Thanks.
Pradip Goswami, P.Eng.
Welding & Metallurgical Engineer/Specialist
Ontario Power Generation Inc.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of venkat ramana
Sent: Tuesday, July 06, 2010 1:27 PM
To: materials-welding@googlegroups.com
Subject: [MW:5885] CVN TESTING
I have doubt in AWS D1.1 which condition CVN test is no required for PQR preparation. Please let me know any body.
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