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Welding Safety

Welding Safety. How to stay alive!. What are some fuels that are around us?. Gasoline Diesel Kerosene Propane Acetylene Natural gas. Wood Coal Oil Corn Butane Ethanol. Which Fuel?.

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Welding Safety

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  1. Welding Safety How to stay alive!

  2. What are some fuels that are around us? • Gasoline • Diesel • Kerosene • Propane • Acetylene • Natural gas • Wood • Coal • Oil • Corn • Butane • Ethanol

  3. Which Fuel? • The best way to determine which fuel to use is to consider its application or how it is going to be used.

  4. Propane & Acetylene • These two fuels are different from other fuels because: • They are gases at normal atmospheric pressure. When they are compressed in a tank they become liquefied.

  5. Parts of the Oxy-Acetylene rig • Acetylene side • Acetylene cylinder (tank) • Cylinder valve • One turn open • Cylinder pressure gauge • Regulator • Hose pressure gauge • Red hose • Acetylene valve on torch

  6. Parts of the Oxy-Acetylene rig • Oxygen side • Oxygen cylinder (tank) • Cylinder valve • Open all the way • Cylinder pressure gauge • Regulator • Hose pressure gauge • Green hose • Oxygen valve on torch

  7. Parts of the Oxy-Acetylene rig • Both have: • Torch mixing chamber • Torch tip • Uses for an oxy-acetylene torch • Cutting • Heating (rose bud) • Welding/brazing

  8. Parts of the Oxy-Acetylene rig

  9. Parts of the torch • Torch body

  10. Parts of the torch • Valves

  11. Parts of the torch • Mixing Chamber

  12. Parts of the torch • Torch tip

  13. Lighting Procedure • Check regulator thumb screws • Turn on oxy valve all the way • Set correct oxy working pressure • 25 – 30 psi • Open fuel valve half turn • Set correct fuel working pressure • 5 – 7 psi

  14. Lighting Procedure • Light the flame • With what? • Shut down flame (fuel first) • Turn fuel cylinder valve off • Empty fuel hose • Turn oxy cylinder valve off • Empty oxy hose • Loosen regulator thumb screws

  15. A tank is a tank right?

  16. Oxygen • Hollow • Green • Open all the way (back seating valve) • 2300 psi • 25 – 30 Working psi • Larger than acetylene • Why?

  17. Acetylene • Not Hollow • Acetone (liquid) • 300 – 350 psi • 5 – 7 Working psi • Explosive at 15 psi • 1/7 rule per hour • Smaller than oxygen

  18. Oxygen • Colorless • Odorless • Promotes combustion • Not flammable

  19. Acetylene • Colorless • Odor • Flammable • Unstable • Explosive over 15 psi

  20. Regulators • There are two gauges on each regulator. One displays the tank pressure, and the other displays the working (hose) pressure.

  21. Regulators • They are needed to: • Reduce tank pressure to working pressure, and • Keep that pressure constant

  22. Arc Welding • SMAW • Shielded Metal Arc Welding • GMAW • Gas Metal Arc Welding • MIG - Metal Inert Gas • TIG - Tungsten Inert Gas • FCAW • Flux Core Arc Welding

  23. SMAW

  24. GMAW

  25. More Hazards with Electricity • Shock • Fumes • UV Rays • Spark Spatter • Fire and Explosion

  26. UV Ray protection • When using an electrical welder you should use a #10 shaded lens. • When welding with oxy-acetylene use #5 shaded lens

  27. Polarity • AC - Alternating Current • DCS - Direct Current Straight • 70% of heat on steel • DCEN (electrode -) • DCR - Direct Current Reverse • 70% of heat on electrode • DCEP (electrode +)

  28. Types of materials used for welding • Mild Steel • High Carbon • Special Alloy • Cast Iron • Nonferrous (Stainless Steel) • Hard facing and Buildup • Aluminum

  29. Purpose of Flux • Easier to strike an arc • Floats impurities (contaminants) to the top • Cleans base metal • Forms slag • Keeps oxygen out of the weld • Improves weld appearance

  30. What else do you need to know? • Throw away used rods 2” or less in the scrap bucket • To avoid welder damage or accidents • Warn people around you when striking an arc to prevent eye burns • “Cover!”

  31. The number means something • Example: E6013 • E = electrode/electricity • 60 = 60,000 psi tensile strength • 1 = position: all • Flat, horizontal, vertical, overhead • 3 = welding current: AC and DC

  32. Safety is #1 • Safety glasses • Helmet • Gloves • Protective clothing • Equipment instruction • Warning others • Distractions • Clean-up • Others

  33. The Fire Triangle

  34. Fire Extinguishers

  35. Class A • Ordinary combustibles • Wood and paper • Shape Triangle

  36. Class B • Flammable liquids • Grease • Gasoline • Oil • Shape Square

  37. Class C • Electrically energized fires • Shape Circle

  38. Class D • Flammable metals • Specific for the type of metal • Shape Star

  39. PASS

  40. Pull

  41. Aim

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