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Oxyfuel Cutting. Chapter 14. Objectives . Identify the various components of an oxyfuel cutting outfit. Cite the maximum safe working pressure used for acetylene gas. Objectives . Describe the function of each component of an gas cutting outfit.
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Oxyfuel Cutting Chapter 14
Objectives • Identify the various components of an oxyfuel cutting outfit. • Cite the maximum safe working pressure used for acetylene gas.
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.
Oxygen control • Velocity • Oxygen pressure • Amount of oxygen • Orifice size
Torch movement • Away from welder not toward • No side to side is needed
Right to left best for right-handed welders Whatever is most comfortable left to right best for left-handed welders Right to left or left to right?
Thin 1/8” or less Use a small tip Slant tip to 15-20° Thick Perpendicular both ways Use a larger tip Cutting Angle
Slag Stream • Less then 1” should go directly through • Thicker then 1” some drag is desirable • To ensure proper oxygen consumption
Drag • The distance between the entry and exit point of the oxygen jet
Causes of Excessive Drag • Incorrect flame adjustment • Oxygen cutting pressure low • Traveling too fast
Effect of Excessive Drag • Not cutting completely through the metal • Cerates turbulence and makes kerf rough
Bell-mouthed kerf • Too much oxygen cerates a bell-mouthed kerf
Piercing • Requires more heat • Use 1 size larger tip • Metal must be heated completely though