Introductory technical guidance for 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, 6. SHIELDED METAL ARC WELDING (SMAW), 7. FLUX CORED ARC WELDING (FCAW), 8. GAS METAL ARC WELDING (GMAW), 9. SUBMERGED ARC WELDING (SAW), 10. GAS TUNGSTEN ARC WELDING (GTAW), 11. ELECTROSLAG WELDING (ESW), 12. ELECTROGAS WELDING (EGW).