Hypertherm Duramax Hyamp Robotic Torch - Manual (Page 49)

Duramax/Duramax Hyamp Robotic Torches Service Manual 807460 49
3 – Operation
Understand and optimize cut quality
Several factors affect cut quality:
 Cut angle – The degree of angularity of the cut edge.
 Dross – The molten material that solidifies on the top or bottom of the workpiece.
 Straightness of the cut surface – The cut surface can be concave or convex.
The following topics explain how these factors can affect cut quality.
Cut or bevel angle
 A positive cut angle results when more material is removed from the top of the cut than from the bottom.
 A negative cut angle results when more material is removed from the bottom of the cut.
Figure 20 – Cut angles
 The squarest cut angle will be on the right side with respect to the forward motion of the
torch. The left side will always have some degree of cut angle.
To determine whether a cut-angle problem is being caused by the plasma system or the drive system, make a test cut and
measure the angle of each side. Next, turn the torch 90° in its holder and repeat the process. If the angles are the same in
both tests, the problem is in the drive system.
If a cut-angle problem persists after mechanical causes have been eliminated, check the torch-to-work distance,
especially if the cut angles are all positive or all negative. Also consider the material being cut: if the metal is magnetized
or hardened, you are more likely to experience cut angle problems.
Dross
Some amount of dross will always be present when cutting with air plasma. However, you can minimize the amount and
type of dross by adjusting your system correctly for your application.
Excess dross appears on the top edge of both pieces of the plate when the torch is too low (or voltage is too low when
using a torch height control). Adjust the torch or adjust the voltage in small increments (5 volts or less) until the dross is
reduced.
Negative cut angle
Square cut
Positive cut angle
Problem Cause
The torch is too low.
The torch is too high.
Solution
Raise the torch; or if you are using a torch height
control, increase the arc voltage.
Lower the torch; or if you are using a torch height
control, decrease the arc voltage.