Oxyfuel Cutting

1
Oxyfuel Cutting

• Chapter 14

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Objectives

• Identify the various components of an oxyfuel
  cutting outfit.
• Cite the maximum safe working pressure used for
  acetylene gas.

3
Objectives

• Describe the function of each component of an gas
  cutting outfit.
• Correctly select the proper cutting tip and
  working pressure for a particular thickness of
  steel.
• Distinguish between a well cut surface and a
  poorly cut surface and be able to adjust where
  necessary to perform a good cut.

4
Cutting Torch
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Oxygen control

• Velocity
• Oxygen pressure
• Amount of oxygen
• Orifice size

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Torch movement

• Away from welder not toward
• No side to side is needed

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Right to left or left to right?

• Right to left best for right-handed welders
• Whatever is most comfortable

• left to right best for left-handed welders

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Cutting Angle

• Thin
• 1/8 or less
• Use a small tip
• Slant tip to 15-20

• Thick
• Perpendicular both ways
• Use a larger tip

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Slag Stream

• Less then 1 should go directly through
• Thicker then 1 some drag is desirable
• To ensure proper oxygen consumption

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Drag

• The distance between the entry and exit point of
  the oxygen jet

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Causes of Excessive Drag

• Incorrect flame adjustment
• Oxygen cutting pressure low
• Traveling too fast

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Effect of Excessive Drag

• Not cutting completely through the metal
• Cerates turbulence and makes kerf rough

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Bell-mouthed kerf

• Too much oxygen cerates a bell-mouthed kerf

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Piercing

• Requires more heat
• Use 1 size larger tip
• Metal must be heated completely though

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Cut Quality