Arc welding
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Arc Welding. Arc Welding ( 아크용접 ) : Electric discharge is heat sorce. Gas tungsten AW (TIG). Shield metal AW. Gas metal AW (MIG). Heat transfer in arc welding. Welding speed is. e = efficiency V = voltage applied I = current u = specific energy A=weld section area.

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Arc Welding

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Arc welding

Arc Welding

Arc Welding (아크용접) : Electric discharge is heat sorce.

Gas tungsten AW

(TIG)

Shield metal AW

Gas metal AW

(MIG)


Heat transfer in arc welding

Heat transfer in arc welding

  • Welding speed is

e = efficiency

V = voltage applied

I = current

u = specific energy

A=weld section area


Shielded metal arc welding

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


Submerged arc welding

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


Gas metal arc welding

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


Flux cored arc welding

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


Electrogas welding

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


Electroslag welding

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


Gas tungsten arc welding

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


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