A40i, A60i
Manual 0-5466 OPERATION
4T-9
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Lead Angle
The angle between the torch and workpiece depends 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 applications, such as removing welds or working with light metal,
this may be desirable.
35°
Workpiece
Torch Head
Standoff Height
A-00941_AB
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 trans-
ferred 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 accumulates 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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