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Unit 14

Unit 14. Arc Welding and Oxy-Gas Cutting. Shielded Metal Arc Welding. Stick Welding Uses an electrode Done with three machines AC: Alternating current DC Direct Current AC/DC Both types of current. Lincoln Electric Photos. Metal Inert Gas Welding (MIG).

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Unit 14

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  1. Unit 14 Arc Welding and Oxy-Gas Cutting

  2. Shielded Metal Arc Welding • Stick Welding • Uses an electrode • Done with three machines • AC: • Alternating current • DC • DirectCurrent • AC/DC • Both types of current Lincoln Electric Photos

  3. Metal Inert Gas Welding (MIG) • Combines electricity and inert shielding gas • Wire fed through gun nozzle • Shielding gas injected • Suited for • Thin-gauge steel • Fast welding • Good control Lincoln Electric Photo

  4. Tungsten Inert Gas Metal (TIG) • Also uses a combination of electricity and inert gas • Electrode=non-combustible • Use the TIG torch and filler rod • AC or DC current • Slower than MIG • Greatest control Lincoln Electric Photo

  5. Welding Equipment • Electrode- metal welding rod • Flux-gas shield for molten pool • Electrode holder-clamp that grips electrode • Ground clamp-clamp attached be a cable to the arc welder

  6. Striking an Arc and Running a Bead • Remember proper PPE! • Understand the process • 1. Strike the arc (scratching or tapping) • 2. Keep electrode correct distance from base metal • 3. Move slowly across metal, form a bead • 4. Let the metal COOL • 5. Remove slag (chipping hammer and metal brush) Jupiter Images

  7. Cutting Equipment

  8. Cutting Attachment

  9. Auxiliary Equipment • Flint lighter- lights the torch • Welding goggles- darker lens • Shaded face shield- in place of goggles • Safety glasses- worn at ALL times • Gloves-protect operator’s hands and forearms

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