This publication provides introductory technical guidance for civil engineers, structural engineers and other professional engineers and construction managers interested in welding structural steel. Here is what is discussed: 1. AISC AND AWS LISTED STRUCTURAL STEELS, 2. WELDABILITY OF STRUCTURAL STEELS, 3. PROPERTY ENHANCEMENTS FOR STRUCTURAL STEELS, 4. SELECTION OF STRUCTURAL STEELS FOR ENVIRONMENTAL EXPOSURE AND SERVICE APPLICATIONS, 5. AVAILABILITY OF STRUCTURAL STEELS.