Hypertherm Powermax 65, Service Manual

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OperatiOn
4-22
powermax
65/85 Service Manual
Cause
The torch is too high.
Solution
Lower the torch; or if you are using a torch
height control, decrease the arc voltage.
Negative cut angle
Problem
Note: 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 bevel.
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, rotate 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 (see 4-21 Ensure the torch and table
are set up correctly ), c heck the t orch-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.
Low-speed dross forms when the torch’s cutting speed is too slow and the arc angles ahead. It forms as a heavy,
bubbly deposit at the bottom of the cut and can be removed easily. Increase the speed to reduce this type of dross.
High-speed dross forms when the cutting speed is too fast and the arc angles behind. It forms as a thin, linear bead of
solid metal attached very close to the cut. It is more firmly attached to the bottom of the cut than at low speed and is
difficult to remove. To reduce high-speed dross:
• Decrease the cutting speed.
• Decrease the torch-to-work distance.
The torch is too low. Raise the torch; or if you are using a torch
height control, increase the arc voltage.
Square cut
Positive cut angle