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Shielded Metal Arc Welding

Shielded Metal Arc Welding. Arc Welding?. Uses electricity for heat. Arc Welding ?. Electrodes (Rods) covered with flux. Arc Welding?. Gas cloud (Shield) around the metal during welding. Arc Welding. Heat for arc welding comes from electricity. Arc Welding.

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Shielded Metal Arc Welding

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  1. Shielded Metal Arc Welding

  2. Arc Welding? • Uses electricity for heat

  3. Arc Welding ? • Electrodes (Rods) covered with flux

  4. Arc Welding? • Gas cloud (Shield) around the metal during welding

  5. Arc Welding • Heat for arc welding comes from electricity

  6. Arc Welding • Welder = machine used for welding that produces a current

  7. Arc Welding • Arc = discharge of electricity • Weldor = a person who welds

  8. Arc Welding • Electrodes = flux coated metal rods

  9. Arc Welding • Electrode Holder = spring loaded device with insulated handles used to grip the electrode

  10. Arc Welding • Ground Clamp = spring loaded clamp that is attached to an electrical cable

  11. Arc Welding • Chipping Hammer = steel hammer with a sharp edge/point and a wire brush

  12. Arc Welding • Helmets = cover your head and neck region-- a # 10 shield is required

  13. Arc Welding • Safety Glasses = must be worn under the welding helmet

  14. Arc Welding • Welding Gloves = insulated gloves worn to protect hands from heat and sparks (not 100%)

  15. Welding Process

  16. W V A W = V X A W = Watts = measure of energy available

  17. W V A W = V X A V = Voltage = measure of electrical pressure

  18. W V A W = V X A A = Amp = rate of flow of current

  19. Temperature • Arc can be up to 9000 degrees F.

  20. Temperature • Depends on: • Arc Length • Electrode type • Amp Setting • Base Metal

  21. Duty Cycle • The percentage of time that a welder can operate without overheating • The number of minutes out of 60 that a welder can operate at full capacity

  22. Duty Cycle • The number of minutes out of 60 that a welder can operate at full capacity

  23. AC/DC • AC • Alternating Current • Rev. Direction

  24. AC/DC • AC -U.S. 60 Cycles per second

  25. AC/DC • AC • Use Transformers to step-down voltage and increase amps

  26. AC/DC • DC • Direct Current • Electricity flows in one direction

  27. AC/DC • DC • Straight vs. Reverse Polarity • Use Generators to produce the DC

  28. Electrode Coding NEMA • Uses color coding on the rods • 3 areas on the rod

  29. Electrode Coding AWS • # coding system on the rods • Each # stands for something

  30. E = Electrode 60 = Tensile Strength 1 = Welding Position 3 = Welding Current E6013

  31. Flux • Shields Outside gasses

  32. Flux • Combines with metal impurities

  33. Flux • Forms Slag • Makes and Maintains Arc

  34. What Affects a Weld Bead??? • Temp of Base Metal • Adjust your Amps

  35. What Affects a Weld Bead??? • Electrode Diameter and Flux Type

  36. What Affects a Weld Bead??? • Amps • Select according to the thickness of your metal

  37. What Affects a Weld Bead??? • Arc Length • “Frying Bacon”

  38. What Affects a Weld Bead??? • Electrode Angle • 10 to 15 degrees from vertical

  39. What Affects a Weld Bead??? • Speed of Travel • Even across the metal

  40. Arc Welding Safety • Weld on a proper surface • Fire Exting./blanket nearby

  41. Arc Welding Safety • Surrounding area??? • Wear all safety equipment/gear

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