CUMASTER A80, A120
Manual 0-5119 4T-9 OPERATION
Lead Angle
The angle between the torch and workpiece de-
pends on the output current setting and torch
travel speed. The recommended lead angle is
35°. At a lead angle greater than 45° the molten
metal will not be blown out of the gouge and may
be blown back onto the torch. If the lead angle
is too small (less than 35°), less material may be
removed, requiring more passes. In some appli-
cations, such as removing welds or working with
light metal, this may be desirable.
Gouging Angle and Standoff Distance
Standoff Distance
The tip to work distance affects gouge quality
and depth. Standoff distance of 1/8 - 1/4 inch
(3 - 6 mm) allows for smooth, consistent metal
removal. Smaller standoff distances may result
in a severance cut rather than a gouge. Standoff
distances greater than 1/4 inch (6 mm) may result
in minimal metal removal or loss of transferred
main arc.
Slag Buildup
Slag generated by gouging on materials such as
carbon and stainless steels, nickels, and alloyed
steels, can be removed easily in most cases. Slag
does not obstruct the gouging process if it accumu-
lates to the side of the gouge path. However, slag
build - up can cause inconsistencies and irregular
metal removal if large amounts of material build
up in front of the arc. The build - up is most often
a result of improper travel speed, lead angle, or
standoff height.
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