Standoff And Cut Quality - ESAB ESP-150 Manuel D'instruction

SECTION 4

STANDOFF AND CUT QUALITY

Standoff (Arc Voltage) has a direct influence on cut quality and squareness. It is
recommended that prior to cutting , that all cutting parameters are set to the
manufacturer's suggested conditions. Refer to the Process Tables for recom-
mendations. A sample cut should be made using actual part material followed by
close examination of the part.
If the cut face of the part has excessive bevel or rounded top edge, it may be that
the standoff is set too high. When standoff is controlled by an arc voltage height
control, reducing the arc voltage setting will reduce the standoff.
Lower the standoff until the excessive bevel or rounded top edge disappears. The
characteristics of plasma cutting hinder production of a perfectly square cut. On
material thicknesses of 1/4 inch or greater, a standoff too close may result in a
negative cut angle.
STANDOFF
LAG LINES
POSITIVE (+) CUT ANGLE
Bottom dimension
"B" is greater than
dimension "A"
NEGATIVE (-) CUT ANGLE
Bottom dimension
"B" is less than
dimension "A"
144
ARC
VOLTAGE
Fig. 17 - Cut Quality
Fig. 18 - Cut Angle
OPERATION
A
B
A
B