Set up and operate machines to fabricate ornamental metal products.
Sets up and operates resistance welding machine to join metal parts, according to blueprints, work orders, or oral instructions: Turns machine dials to set air and hydraulic pressure, amperage, and joining time, according to specified type of metal, weld, and assembly. May select, install, and adjust electrodes. Aligns workpieces, using square and rule. May hold pieces together manually, fasten into jigs, or secure with clamps to align in specified assembly position. Holds part between electrodes or positions on machine worktable. Depresses pedal or pulls trigger to close electrodes and form weld at point of contact. Releases pedal or trigger after specified welding time. Cleans electrodes, using file, tip dresser, emery cloth. May operate machine which automatically releases electrodes from metal after welding cycle. May devise and build fixtures to hold pieces. May inspect finished work. May operate machine equipped with two or more electrodes which weld at several points simultaneously. Important variations include types of joints welded and types of materials welded. May be designated according to type of resistance-welding machine operated as Flash-Welding-Machine Operator; Percussion-Welding-Machine Operator; Projection-Welding-Machine Operator; Upset-Welding-Machine Operator.