1. Oxyfuel Cutting
Chapter 14

2. 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

8. Oxygen control
Velocity
Oxygen pressure
Amount of oxygen
Orifice size

9. Torch movement
Away from welder not toward
No side to side is needed

10. 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

11. Cutting Angle Thin 1/8” or less Use a small tip Slant tip to 15-20°
Thick
Perpendicular both ways
Use a larger tip

13. Slag Stream Less then 1” should go directly through
Thicker then 1” some drag is desirable
To ensure proper oxygen consumption

14. Drag
The distance between the entry and exit point of the oxygen jet

16. Causes of Excessive Drag
Incorrect flame adjustment
Oxygen cutting pressure low
Traveling too fast

17. Effect of Excessive Drag
Not cutting completely through the metal
Cerates turbulence and makes kerf rough

18. Bell-mouthed kerf
Too much oxygen cerates a bell-mouthed kerf

19. Piercing Requires more heat Use 1 size larger tip
Metal must be heated completely though

20. Cut Quality