1. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Arc Welding Shield metal AWGas metal AW (MIG) Gas tungsten AW (TIG) Arc Welding ( 아크용접 ) : Electric discharge is heat sorce.

2. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Heat transfer in arc welding Welding speed is e = efficiency V = voltage applied I = current u = specific energy A=weld section area

3. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Shielded metal arc welding SMAW ( 피복금속 AW) 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. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes 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. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Gas metal arc welding GMAW( 가스방호 AW)= MIG (metal inert-gas welding) Weld area is shielded by gas (Ar, He, CO 2 ) to prevent oxidation. MIG: http://ma.gnu.ac.kr/vod/Joining/Metal_Inert_Gas_Welding.MP4http://ma.gnu.ac.kr/vod/Joining/Metal_Inert_Gas_Welding.MP4

6. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Flux-cored arc welding FCAW ( 유심용제 AW) 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=chE6RPhM3xEhttp://www.youtube.com/watch?v=chE6RPhM3xE

7. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes 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. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Electroslag welding 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. © Pearson & GNU Su-Jin Kim Welding & Joining Manufacturing Processes Gas tungsten arc welding GTAW( 텅스텐 AW)=TIG(Tungsten inert gas) A filler metal is supplied from a filler wire. http://www.youtube.com/watch?v=VEEpikDY058