A Multi-Welder for Carbon Steel (CS) and Stainless Steel (SS) performs high-quality welding, typically in 6G positions, using GTAW (TIG), SMAW (Stick), and FCAW/MIG processes to fabricate pipes, structural components, or vessels. Responsibilities include reading blueprints, adhering to ASME/AWS codes, ensuring proper purge/cleanliness for SS, and passing qualification tests.