Tweco 15XC Merlin - Manual (Page 57)

Manual 0-2251 4-23 OPERATION
4.9 GOUGING OPERATION (continued)
Gouging performance depends on the torch travel speed,
the current level, the angle at which the torch is held to the
workpiece (lead angle), and the distance between the torch
tip and the workpiece (standoff). Gouging can be accom-
plished with either a hand or machine torch.
Optimum torch travel speed for gouging is between 20
and 120 inches per minute (0.5 and 3.0 meters per minute).
Travel speed is dependent on current setting, lead angle,
mode of operation (hand or machine torch), and desired
results.
Current settings depend on torch travel speed, the mode of
operation (hand or machine torch), and the amount of
material to be removed.
The angle at which the torch is held depends on the cur-
rent setting and the torch travel speed. The recommended
lead angle is 20-25°. An angle greater than 25° may result
in inconsistent metal removal, blowback of slag, and
contaminated gouges. If the lead angle is too small (less
than 20°), less material may be removed, requiring more
passes. In some applications, such as removing welds or
working with light metal, this may be desirable.
Gouging Parameters
Torch Travel Speed
Figure 4-M Gouging Parameters
Current Setting
Lead Angle
(Travel Angle)