ESAB ESP-150 Instruction Manual page 36

SecTION 4
Do NOT operate the unit with the cover
removed.
Do NOT apply power to the unit while
holding or carrying the unit.
Do NOT touch any torch parts with power
switch on.
Position the eSP-150 at least 10 feet (3
meters) from the cutting area. Sparks and
hot slag from the cutting operation can
damage the unit.
6. The cutting arc will extinguish at the end of the cut; however, the torch
switch should be released to keep the pilot arc from reigniting.
7. When cutting operation is completed, wait a few minutes before placing
the POWER switch to the OFF position so that the cooling fan has time
to remove the heat from the unit. Then shut off the primary power at the
main disconnect switch.
correct
With a positive cut angle, the top dimension is slightly less than the bottom dimen-
sion. With a negative cut angle, the top dimension is slightly greater than the bottom
dimension. The cut angle is controlled by the standoff (arc voltage), cutting speed
and cutting current. If the cutting speed and the cutting current are correct and the
part has an excessive positive angle, then the standoff is too high. Begin lowering
the arc voltage in increments of 5 volts, observing cut squareness. There will always
be slight top edge rounding of the part when using Nitrogen.
The optimum torch height is a point just before the part begins to develop a negative
cut angle. To expand upon the other two variables; with the correct torch standoff,
excessive cutting speed will result in a positive cut angle; insufficient cutting speed
will produce a negative cut angle. If the cutting current is too high or low, a positive
cut angle will be produced.
Arc Voltage/Standoff - Interactive parameters that are proportional. The higher the
torch above the plate (standoff ), the higher the operating voltage required and vice
versa.
Lag Lines - These lines appear on the cut surface. They are of assistance in determin-
ing if your process parameters are correct.
36
too fast
Fig. 16 - effect of cutting Speed
OPeRaTION
too slow