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Application 

This Code covers welding requirements applicable to weld 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, and 11 while provisions applying exclusively to stqtic loading (buildings), dynamic loading (bridges), 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 judgement with respect to the suitability of application of these joints to a welded assembly.

The fundamental premise of the Code is to provide general stipulations applicable to any situation. Acceptance criteria for production welds different from those specified in the Code may be used for a particular application, provided they are suitably documented by the proposer and approved by the Engineer. These alternate acceptance criteria can be based upon evaluation of suitability for service using past experience, experimental evidence or engineering analysis considering material type, service load effects, and environmental factors. 

All references to the need for approval shall be interpreted to mean approval by the Building Commissioner or the Engineer. Hereinafter, the term Engineer will be used, and it is to be construed to mean the Building Commissioner or the Engineer. 

Most provisions of the Code are mandatory when the use of the Code is specified. Certain provisions are optional and apply only when specified in contract document for a specific project. Examples of common optional erquirement and typical ways to specify them are given in Appendix D.