Tweco 75XL Plus PAK Master - Manuel (Page 36)

OPERATION 4-6 Manual 0-2807
Nitride Build-up
Nitride deposits which may remain on the surface of the
cut when nitrogen is present in the plasma gas stream.
Nitride buildups may create difficulties if the material is
welded after the cutting process.
Kerf Width
Cut Surface
Bevel Angle
Top Edge
Rounding
Cut Surface
Drag Lines
Dross
Build-Up
Top
Spatter
A-00007
Figure 4-6 Cut Quality Characteristics
Cut quality will vary on different types of and material
thicknesses.
The following table shows the cut quality that can be ex-
pected from this equipment for materials with a thick-
ness from gauge to 3/4 inch (19.1mm):
T yp e o f M a t e r ia l
G a s
C a r b o n
S t ee l
S t ain les s
S t ee l
A lu m in u m
A i r
G o o d -
E x c e l l e n t
G o o d -
E x c e l l e n t
G o o d -
E x c e l l e n t
N i tr o g e n G o o d G o o d G o o d
Description of Cut Characteristics
Excellent - Minimum bevel (0 - 4°), minimum kerf (2 x
tip orifice diameter), little or no dross, smooth
cut surface.
Good - Slight bevel (0 - 10°), slightly wider kerf (2-1/2 x
tip orifice diameter), some dross (easily re-
moved), medium-smooth cut surface, slight top
edge rounding.
Fair - Excessive bevel (over 10°), wide kerf (over 2-1/2 x
tip orifice diameter), medium to heavy dross, rough
cut surface, top edge rounding.
NOTES
Cut quality depends heavily on set-up and param-
eters such as torch standoff, alignment with the
workpiece, cutting speed, gas pressures, and op-
erator ability.