Hypertherm HRT - Manual (Page 90)

OPERATION
3-54 Duramax Retrofit Torch
Operator Manual
Dross forms on the bottom of the cut. Causes can be:
• The consumables are worn and need to be replaced. For optimized performance in a
mechanized application, replace the nozzle and the electrode together.
• The cutting speed is not correct. See “Using the cut charts” on page 3‑3 for more
information.
• The current (amperage) is set too low. See “Using the cut charts” on page 3‑3 for more
information.
The cut angle is not square. Causes can be:
• The torch is not square to the workpiece.
• The consumables are worn and need to be replaced. For optimized performance in a
mechanized application, replace the nozzle and the electrode together.
• The direction of the torch travel is incorrect. The high‑quality cut is always on the right with
respect to the forward motion of the torch.
• The distance between the torch and the workpiece is not correct.
• The cutting speed is not correct. See “Using the cut charts” on page 3‑3 for more
information.
The consumables’ life is shortened. Causes can be:
• The arc current, arc voltage, travel speed, and other variables are not set as recommended
in the cut charts.
• Firing the arc in the air (beginning or ending the cut off of the plate surface). Starting at the
edge is acceptable as long as the arc makes contact with the workpiece when started.
• Starting a pierce with an incorrect torch height. Refer to the cut charts for the specific
initial pierce height.