2. Shielded Metal Arc Welding

3. Arc Welding? Uses electricity for heat

4. Arc Welding ? Electrodes (Rods) covered with flux

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

6. Arc Welding Heat for arc welding comes from electricity

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

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

9. Electrodes = flux coated metal rods Arc Welding

10. Electrode Holder = spring loaded device with insulated handles used to grip the electrode

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

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

13. Helmets = cover your head and neck region-- a # 10 shield is required

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

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

16. Welding Process

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

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

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

20. Temperature Arc can be up to 9000 degrees F.

21. Temperature Depends on: –Arc Length –Electrode type –Amp Setting –Base Metal

22. 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

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

24. AC/DC AC –Alternating Current –Rev. Direction

25. AC/DC AC -U.S. 60 Cycles per second

26. AC/DC AC –Use Transformers to step-down voltage and increase amps

27. AC/DC DC –Direct Current –Electricity flows in one direction

28. AC/DC DC –Straight vs. Reverse Polarity –Use Generators to produce the DC

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

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

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

32. Flux Shields Outside gasses

33. Flux Combines with metal impurities

34. Flux Forms Slag Makes and Maintains Arc

35. What Affects a Weld Bead??? Temp of Base Metal –Adjust your Amps

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

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

38. What Affects a Weld Bead??? Arc Length –“Frying Bacon”

39. What Affects a Weld Bead??? Electrode Angle –10 to 15 degrees from vertical

40. What Affects a Weld Bead??? Speed of Travel –Even across the metal

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

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