In this lecture on Practical & Lab Demonstration: GTAW of Similar and Dissimilar Steels, we explore gas tungsten arc welding (GTAW) through practical demonstrations. The session covers system components of GTAW, welding practices for similar and dissimilar steels, and the effects of welding current. It also compares A-TIG single pass and M-TIG joints, followed by analysis of the weld joint's microstructure and properties.