Nitride Build - Up; Bevel Angle; 04 Cut Quality; 05 General Cutting Information - ESAB A120 Operating Manual

3. Install the replacement Electrode by pushing it
straight into the torch head until it clicks.
4 . Install the starter cartridge and desired tip for the
operation into the torch head.
5. Hand tighten the shield cup assembly until it is
seated on the torch head. If resistance is felt
when installing the cup, check the threads before
proceeding.

4T.04 Cut Quality

NOTE!
Cut quality depends heavily on setup
and parameters such as torch standoff,
alignment with the workpiece, cutting
speed, gas pressures, and operator
ability.
Cut quality requirements differ depending on applica-
tion. For instance, nitride build - up and bevel angle
may be major factors when the surface will be welded
after cutting. Dross - free cutting is important when fin-
ish cut quality is desired to avoid a secondary cleaning
operation. The following cut quality characteristics are
illustrated in the following figure:
Kerf Width
Top
Spatter
Dross
Build-Up
Cut Quality Characteristics
Cut Surface
The desired or specified condition (smooth or rough)
of the face of the cut.

Nitride Build - Up

Nitride deposits can be left on the surface of the cut
when nitrogen is present in the plasma gas stream.
These buildups may create difficulties if the material
is to be welded after the cutting process.

Bevel Angle

The angle between the surface of the cut edge and
a plane perpendicular to the surface of the plate.
A perfectly perpendicular cut would result in a 0°
bevel angle.
0-5430
Cut Surface
Bevel Angle
Top Edge
Rounding
Cut Surface
A-00007
Drag Lines
Top - Edge Rounding
Rounding on the top edge of a cut due to wearing
from the initial contact of the plasma arc on the
workpiece.
Bottom Dross Buildup
Molten material which is not blown out of the cut area
and resolidifies on the plate. Excessive dross may
require secondary cleanup operations after cutting.
Kerf Width
The width of the cut (or the width of material removed
during the cut).
Top Spatter (Dross)
Top spatter or dross on the top of the cut caused by
slow travel speed, excess cutting height, or cutting
tip whose orifice has become elongated.
4T.05 General Cutting Information
WARNING
!
Disconnect primary power at the source
before disassembling the power supply,
torch, or torch leads.
Frequently review the Important Safety
Precautions at the front of this manual.
Be sure the operator is equipped with
proper gloves, clothing, eye and ear
protection. Make sure no part of the
operator's body comes into contact with
the workpiece while the torch is acti-
vated.
CAUTION
!
Sparks from the cutting process can
cause damage to coated, painted, and
other surfaces such as glass, plastic
and metal.
NOTE!
Handle torch leads with care and protect
them from damage.
Piloting
Piloting is harder on parts life than actual cutting
because the pilot arc is directed from the electrode
to the tip rather than to a workpiece. Whenever
possible, avoid excessive pilot arc time to improve
parts life.
Torch Standoff
Improper standoff (the distance between the torch tip
and workpiece) can adversely affect tip life as well as
shield cup life. Standoff may also significantly affect
OPERATION
CUTMASTER A120
4T-3