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Determine types and temperatures of baths and quenching media needed to attain specified part hardness, toughness, and ductility, using heat-treating charts and knowledge of methods, equipment, and metals.
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Stamp heat-treatment identification marks on parts, using hammers and punches.
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Record times that parts are removed from furnaces to document that objects have attained specified temperatures for specified times.
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Read production schedules and work orders to determine processing sequences, furnace temperatures, and heat cycle requirements for objects to be heat-treated.
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Start conveyors and open furnace doors to load stock, or signal crane operators to uncover soaking pits and lower ingots into them.
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Heat billets, bars, plates, rods, and other stock to specified temperatures preparatory to forging, rolling, or processing, using oil, gas, or electrical furnaces.
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Instruct new workers in machine operation.
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Move controls to light gas burners and to adjust gas and water flow and flame temperature.
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Load parts into containers and place containers on conveyors to be inserted into furnaces, or insert parts into furnaces.
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Signal forklift operators to deposit or extract containers of parts into and from furnaces and quenching rinse tanks.
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Set and adjust speeds of reels and conveyors for prescribed time cycles to pass parts through continuous furnaces.
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Reduce heat when processing is complete to allow parts to cool in furnaces or machinery.
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Examine parts to ensure metal shades and colors conform to specifications, using knowledge of metal heat-treating.
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Mount workpieces in fixtures, on arbors, or between centers of machines.
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Clean oxides and scales from parts or fittings, using steam sprays or chemical and water baths.
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Adjust controls to maintain temperatures and heating times, using thermal instruments and charts, dials and gauges of furnaces, and color of stock in furnaces to make setting determinations.
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Set up and operate or tend machines, such as furnaces, baths, flame-hardening machines, and electronic induction machines, that harden, anneal, and heat-treat metal.
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Repair, replace, and maintain furnace equipment as needed, using hand tools.
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Position stock in furnaces, using tongs, chain hoists, or pry bars.
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Test parts for hardness, using hardness testing equipment, or by examining and feeling samples.
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Mount fixtures and industrial coils on machines, using hand tools.
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Remove parts from furnaces after specified times, and air dry or cool parts in water, oil brine, or other baths.
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Determine flame temperatures, current frequencies, heating cycles, and induction heating coils needed, based on degree of hardness required and properties of stock to be treated.