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Arc Welding

Arc Welding

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Arc Welding

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  1. Arc Welding Arc Welding (아크용접) : Electric discharge is heat sorce. Gas tungsten AW (TIG) Shield metal AW Gas metal AW (MIG)

  2. Heat transfer in arc welding • Welding speed is e = efficiency V = voltage applied I = current u = specific energy A=weld section area

  3. Shielded metal arc welding • SMAW (피복금속AW) is the simplest and most versatile joining process. • It uses a consumable electrode coated in flux giving off a shielding gas. http://www.youtube.com/watch?v=TeBX6cKKHWY&feature=related

  4. Submerged arc welding • Weld arc is covered by a flux powder which is fed into the weld zone by gravity through a nozzle. • Flux completely covers the molten metal and prevents weld from oxidization and spatter. http://www.youtube.com/watch?v=Uns93e4HaNU&feature=related

  5. Gas metal arc welding • GMAW(가스방호AW)= MIG (metal inert-gas welding) • Weld area is shielded by gas (Ar, He, CO2) to prevent oxidation. MIG: http://ma.gnu.ac.kr/vod/Joining/Metal_Inert_Gas_Welding.MP4

  6. Flux-cored arc welding • FCAW (유심용제AW) is similar to MIG but electrode is tubular and filled with flux. • Continuous and automatic electrode feeding. FCAW vs. MIG: http://www.youtube.com/watch?v=chE6RPhM3xE

  7. Electrogas welding • EGW welds thick vertical edges in one pass with special equipment. A shielding gas is sometimes used. Used in shipbuilding and storage tanks. http://www.youtube.com/watch?v=8nwP0JYQIdg

  8. Electroslagwelding • ESW is for thick (25~300mm) vertical edges. • Flux is added. After the molten slag reaches the tip of the electrode, arc is extinguishes and energy is supplied through the electrical resistant of the molten zone. http://www.youtube.com/watch?v=rCL8NCy2eg8

  9. Gas tungsten arc welding • GTAW(텅스텐AW)=TIG(Tungsten inert gas) • A filler metal is supplied from a filler wire. http://www.youtube.com/watch?v=VEEpikDY058