This code supplements the requirements of AWS D1.1, Structural Welding Code - Steel. This code is intended to be applicable to welded joints in seismic load resisting systems designed in accordance with the AISC Seismic Provisions. Sections 1-5 constitute a body of rules for the regulation of welding in seismic load resisting systems. There are seven mandatory annexes in this code. A commentary of the code is included with the document.