Thermal Dynamics A80 CUTMASTER, Руководство по эксплуатации, Страница: 47 / 130

A80
0-4985 OEPRATION
4T-7
4T.07 Gouging
!!
WARNING
Be sure the operator is equipped with proper
gloves, clothing, eye and ear protection
and that all safety precautions at the front
of this manual have been followed. Make
sure no part of the operator’s body comes in
contact with the workpiece when the torch
is activated.
Disconnect primary power to the system
before disassembling the torch, leads, or
power supply.
!!
CAUTION
Sparks from plasma gouging can cause dam-
age to coated, painted or other surfaces such
as glass, plastic, and metal.
Check torch parts. The torch parts must cor-
respond with the type of operation. Refer to
Section 4T.09, Torch Parts Selection.
Gouging Parameters
Gouging performance depends on parameters such as
torch travel speed, current level, lead angle (the angle
between the torch and workpiece), and the distance
between the torch tip and workpiece (standoff).
!!
CAUTION
Touching the torch tip or shield cup to the
work surface will cause excessive parts wear.
Torch Travel Speed
NOTE!
Refer to Appendix Pages for additional infor-
mation as related to the Power Supply used.
Optimum torch travel speed is dependent on current
setting, lead angle, and mode of operation (hand or
machine torch).
Current Setting
Current settings depend on torch travel speed, mode
of operation (hand or machine torch), and the amount
of material to be removed.
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 mate-
rial 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
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 accumulates to the side of the
gouge path. However, slag build - up can cause incon-
sistencies 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.