An Argon Welder performs TIG (Tungsten Inert Gas) welding, a precise method using an inert gas to join metals like steel and aluminum, requiring an understanding of blueprints, skilled operation of welding equipment, and strict adherence to safety protocols. Key responsibilities include preparing metal surfaces, executing high-quality welds in various positions, inspecting the finished work, performing routine equipment maintenance, and collaborating with team members to ensure project success and compliance with standards.