Tweco 30 O2 Auto-Cut - Manuel (Page 77)

Manual No. 0-4818 Auto-Cut 300
2
4-9 OPERATION
Cut Quality
Cut quality requirements differ depending on application. For instance, nitride buildup and bevel angle may be
major factors when the surface will be welded after cutting. Dross-free cutting is important when finish cut quality
is desired to avoid a secondary cleaning operation. Cut quality will vary on different materials and thicknesses.
Right Side
Cut Angle
Left Side
Cut Angle
A-00512
Kerf Width
Cut Surface
Bevel Angle
Top Edge
Rounding
Cut Surface
Drag Lines
Dross
Build-Up
Top
Spatter
A-00007
Cut Surface
The condition (smooth or rough) of the face of the cut.
Bevel Angle
The angle between the surface of the cut edge and a plane perpendicular to the surface of the plate. A perfectly
perpendicular cut would result in a 0° bevel angle.
Top-Edge Rounding
Rounding on the top edge of a cut due to wearing from the initial contact of the plasma arc on the workpiece.
Dross Buildup and Top Spatter
Dross is molten material which is not blown out of the cut area and resolidifies on the plate. Top spatter is
dross which accumulates on the top surface of the workpiece. Excessive dross may require secondary cleanup
operations after cutting.
Kerf Width
The width of material removed during the cut.
Nitride Buildup
Nitride deposits which may remain on the cut edge of the carbon steel when nitrogen is present in the plasma
gas stream. Nitride buildups may create difficulties if the steel is welded after the cutting process.