Federal job category 3700 includes skilled trades focused on processing and treating metals to achieve specific properties like strength, durability, and workability. These roles involve tasks such as welding, casting, plating, heat treating, annealing, and refining. Employees in this category work with raw and semi-finished metal materials to fabricate, repair, or enhance components used in federal equipment, infrastructure, and vehicles. The work requires knowledge of metallurgy, precision handling of tools and machinery, and strict adherence to safety protocols.

Most positions fall under the Federal Wage System and are hands-on, often located in military depots, shipyards, and industrial facilities. Workers may operate furnaces, welding rigs, or plating tanks, and must interpret technical drawings and specifications to meet exact standards. Whether reinforcing structural components or producing mission-critical parts, GS-3700 roles demand craftsmanship, attention to detail, and a deep understanding of metal behavior under various treatments. These jobs are essential to maintaining the strength and reliability of federal assets.