beautypg.com

Operation duramax retrofit torch – Hypertherm HRT User Manual

Page 87

background image

OPERATION

Duramax Retrofit Torch

Operator Manual

3-51

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 “Ensure the

torch and table are set up correctly” on page 3‑49), 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.

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

This manual is related to the following products: