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Welding Code specialists

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Steel Truss Joists manufacturers have certified AWS welders in their
fabrication shops(shops are certified too), yet I have seen manufacturers
stating exclusions to AWS-D1.1 of the specifications, when bidding on
projects. I need some insights to the cause of this exclusion. For those
experienced in welding:

1) What are the reasons for this exclusion? Is this specification too
stringent for the industry standards or does one know the intent of this

2)Does AWS-D1.1 only apply to certain types of welding in uncontrolled
environment (field welding) or it applies to all types of welding even in a
controlled environment(Shop welding)?

Shirish V. Mistry. S.E.