Final - F rom the DVD * Which non-t raditional Plastic...

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From the DVD *Which non-traditional Plastic process is illustrated in the DVD “Fundamental Manufacturing Processes” Electrical Discharge Machining (EDM) *What are the three layers of a part’s surface after undergoing EDM. The three layers are the following: (1) Spheres attached to the surface made of part material and electrode material that have spattered the suface. This layer is easily removed. (2) Recast or white layer where EDM has altered the workpiece metallurgical structure. It can be reduced by specifying the proper settings and removed by polishing. (3) Heat affected zone or annealed layer. It has only been heated, not melted. *What are the two other names for ram type EDMs? A ram type EDM machines is also called a die sinker and a vertical EDM machine. *Name the 4 subsystems in a RAM EDM process: Power Supply, Dielectric System, Electrode, Servo System. *Name the 4 subsystems in a wire EDM process. Power supply, dielectric system, wire feeding system, positioning system. Criteria ECM EDM Material Conducti ve Conducti ve Mechanis m Thermal Chemical Cutting Force None None MRR Low High Chapter 30 Book Questions
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SMAW is an arc shielding process that uses a consumable electrode consisting of a filler metal rod coated with chemicals that provide flux and shielding. RW consists of a group of fusion welding processes that utilize a combination of heat and pressure to accomplish coalescence of the two faying surfaces. Most prominent in the group is resistence spot welding. Steps in resistence spot welding operation: (1)Parts are inserted between electrodes (2)Squeeze the parts between the electrodes (3)Weld, In which the current is switched on for a brief duration(0.1-0.4 sec) (4)Hold, during which the weld nugget solidifies, and (5)the electrodes are opened and the parts removed. EBW is usually carried out in a vacuum for a high quality weld. The time to draw the vacuum adds significantly to the production cycle time. Advantages of LBW over EBW are (1) no vacuum chamber is required in LBM. (2)No x-rays are emitted in LBM (3) The laser beam can be focused and directed with conventional optical mirrors and lenses. The feature that distinguishes fusion welding from solid state welding is that melting of the faying surfaces occurs during fusion welding but not in solid state welding. Fusion Welding Process: (a)Electrogas welding (b)electro beam welding (e)laser welding (c)pressure gas welding (d)resistance welding. MIG welding is a term sometimes applied when referring to: (b)GMAW “Stick” welding is a term sometimes applied when referring to: (d)SMAW Resistance Welding processes make use of the heat generated by electrical resistance to achieve fusion of the two parts to be joined; no pressure is used in these processes, and no filler metal is added. FALSE b/c pressure is applied in RW processes and is key to the success of these processes. SMAW: Shielded Metal Arc Welding. Filler rod is commonly used in SMAW.
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This note was uploaded on 09/24/2011 for the course ENTC 181 taught by Professor Hung during the Spring '08 term at Texas A&M.

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Final - F rom the DVD * Which non-t raditional Plastic...

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