Inspect, measure, or test completed metal workpieces to ensure conformance to specifications, using measuring and testing devices. Read blueprints, work orders, or production schedules to determine product or job instructions or specifications. Assemble, align, and clamp workpieces into holding fixtures to bond, heat-treat, or solder fabricated metal components. Set up, operate, or tend welding machines that join or bond components to fabricate metal products or assemblies. Lay out, fit, or connect parts to be bonded, calculating production measurements as necessary. Correct problems by adjusting controls or by stopping machines and opening holding devices. Give directions to other workers regarding machine set-up and use. Select, position, align, and bolt jigs, holding fixtures, guides, or stops onto machines, using measuring instruments and hand tools. Mark weld points and positions of components on workpieces, using rules, squares, templates, or scribes. Transfer components, metal products, or assemblies, using moving equipment. Clean, lubricate, maintain, and adjust equipment to maintain efficient operation, using air hoses, cleaning fluids, and hand tools. Prepare metal surfaces or workpieces, using hand-operated equipment, such as grinders, cutters, or drills. Conduct trial runs before welding, soldering, or brazing and make necessary adjustments to equipment. Remove completed workpieces or parts from machinery, using hand tools. Tend auxiliary equipment used in welding processes.