AnnealingMetals-ThursoHighTechnologies.pptVIP

Annealing Metals Answer each question in your jotter then look at the next slide to check your answer. 1) What is Work Hardening? When a metal is worked (hammered or rolled) the structure of the metal changes and work hardening occurs. Effectively the metal becomes harder to shape. Annealing reverses this process and makes the metal easier to work Annealing is a heat treatment of a metal designed to produce a soft, ductile condition. Typically the metal is heated and allowed to cool slowly. Work Hardening Bossing Mallet Sand Bag The Forge 2) When using the forge what safety precautions should you take? Annealing Metals When annealing metals the following safety equipment should be worn. Leather Apron Goggles Leather Gloves The Forge Hearth Canopy Fire Bricks On / Off Switch Isolating Switch Ceramic Chips Spark Ignition switch Brazing Torch Spark Blacksmiths Tongs 1. Care should be taken when carrying hot metals (particularly metals at black heat that may not appear hot) 2. Clay bricks should not be heated as they can disintegrate violently. 3. Ceramic chips remain hot for a considerable time after the heat source has been removed. 4. Foreign materials present in the forge can cause fumes. Stones can explode. 5. Quenching of hot materials, particularly tubular components can cause risk of scalding. 6. Fuel combustion can produce dangerous gasses. Pupils should be aware of the following hazards Conditions of use. Appropriate safety equipment must be worn: Goggles, Leather gloves. (Leather apron where appropriate) The Forge 3) How do you anneal Aluminium? Due to aluminiums low melting temperature aluminium tends to melt before it turns red hot. Annealing Aluminium To overcome this when annealing aluminium you must follow this process (As you work the metal this process may need repeated a number of times) 1) Mark Aluminium with soap 2) Heat Aluminium until soap turns black 3) Quench 4) How do you anneal Copper? Annealing Copper To Anneal copper the metal