AWS D1.1 PDF

Application 

This Code covers welding requirements applicable to welded structures. It is to be used in conjunction with any complementary code or specification for the design and construction of steel structures. It is not intended to apply to pressure vessels or pressure piping. Requirements that are essentially common to all structures are covered in Sections 1 through 7, while provisions applying exclusively to buildings (static loading), bridges (dynamic loading), or tubular structures are included in Sections 8,9, and 10, respectively.

Note: The use of prequalified joints is not intended as a substitute for engineering judgment with respect to the suitability of application of these joints to a welded assembly. 

All references to the need for approval shall be interpreted to mean approval by the Building Commissioner1,' the Engineer,2 or the duly designated person acting for and in behalf of the owner on all matters within the scope of this code. Hereinafter, the term Engineer will be used, and it is to be construed to mean the Building Commissioner, the Engineer, or the duly designated person who acts for and in behalf of the owner on all matters within the scope of this code.

1. The term "Building Commissioner" refers to the official or bureau, by whatever term locally designated, who is delegated to enforce the local building law or specifications or other construction regulations. 2. The Engineer is the duly designated person who acts for and in behalf of the owner on all matters within the scope of this code.