1.1 This specification covers laser and laser hybrid welded austenitic, ferritic, and duplex (ferritic-austenitic) stainless steel bars, plates, and shapes of structural quality for use in bolted or welded structural applications. Note 1: The term laser fusion is also used to describe laser welding. 1.1.1 Supplementary requirements (S1, S2, S3) of an optional nature are provided. They shall apply only when specified by the purchaser. 1.2 Shapes covered in this specification include those classified in Article 3.1.2 of Specification A6/A6M, Specification A554 square and rectangular hollow sections, and additional shapes, including customized, that are made from two or more shapes or plates. 1.3 This specification establishes the minimum requirements for manufacturing of laser and laser hybrid welded stainless steel shapes. 1.4 This specification refers to Specifications A240/A240M, A276/A276M, A554, or A479/A479M for chemical requirements, but the mechanical test requirements are determined by the mechanical properties section of this standard.