ApplyingHeatTreatingProcesses-WordPress.com.ppt

Applying Heat Treating Processes Interest Approach I am going to heat this piece of metal with my gas torch. Once the metal is hot, what can I now do with this piece of metal and why? Is there a connection here for treating metals with heat? Student Learning Objectives Identify the tools and equipment used for hot metal work. Explain the processes of measuring and holding metal. Describe the methods of heating, cutting, squaring, drawing out, upsetting, bending, twisting, and punching holes in hot metal. Student Learning Objectives Describe the heat treating processes: hardening, tempering, and annealing. Identify the safety practices to follow when working with hot metal. Terms Annealing steel Cementite Ferrite Hardening steel Martensite Pearlite Tempering steel What are the tools and equipment used for hot metal work? There are several pieces of equipment used for hot metal work. Hot Metal Tools Equipment used in the heating of stock may be a gas welding/cutting torch, a carbon arc torch, a forge, a furnace or a stove. Hot Metal Tools A forge is the most economical way to heat large areas of metal. Hot Metal Tools When the metal to be heated cannot be removed from a machine, or when the area to be heated is small, a gas welding/cutting torch or a carbon arc torch can be used. Torch When heating with the gas welding/cutting torch or carbon arc torch, care must be exercised because of the intense heat. If too much heat is used, the metal may oxidize and checking of the metal may occur. Hot Metal Tools Anvils and bases are a necessity in hot metal work and are also used in other repair jobs, such as bending, straightening, cutting, and riveting cold metal. Anvils and Bases The anvil should be of good quality; otherwise, the steel face will crack and chip. Anvils and Bases Various types of anvil bases are used; chunks of wood, masonry, or metal frames with the top of the anvil at a convenient working height. If concrete or metal frames are used, a two inch b