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CUT QUALITY
Dross
The formation of dross on the bottom of the plate can be caused when cutting parameters such as speed,
amperage, arc voltage, gas pressure/flow and type of gas are not correct for the metal type and thickness
being cut. Most commonly, incorrect cutting speeds are to blame for excessive dross. High cutting speeds
can results in high speed dross that can be very hard to remove without grinding. Low speed dross can be
easily removed with a brush or chip hammer.
Top edge rounding
This is when the top edge of the cut face has eroded away and is not square which is created from the
plasma cutting process. It is generally caused when cutting with excessive current or standoff distance.
This can be a common occurrence when cutting thickness materials.
TYPICAL CUTTING SPEEDS
Cutting speeds can vary according to power source output, cutting table quality, material thickness along
with material type being cut as well as the operators skill set.
Speeds shown below are offered as a guide only for our Jasic cutting systems using compressed air,
cutting mild steel material with the stated output currents ensuring that the cutting tip fitted matches the
stated amperages.
Material Thickness
Amperage
Speed mm/m
Air Pressure
40
5000 - 6000
5 bar / 73psi
1mm
60
6200 - 7000
5 bar / 73psi
80
7200 - 8000
5 bar / 73psi
40
1800 - 2600
5 bar / 73psi
3mm
60
3200 - 4200
5 bar / 73psi
80
3800 - 4600
5 bar / 73psi
40
800 - 1100
5 bar / 73psi
6mm
60
1200 - 2000
5 bar / 73psi
80
1800 - 2500
5 bar / 73psi
40
200 - 300
5 bar / 73psi
12mm
60
400 - 650
5 bar / 73psi
80
650 - 820
5 bar / 73psi
60
400 - 500
5 bar / 73psi
15mm
80
450 - 540
5 bar / 73psi
100
750 - 880
5 bar / 73psi
60
280 - 340
5 bar / 73psi
20mm
80
380 - 450
5 bar / 73psi
100
400 - 480
5 bar / 73psi
120
650 - 750
5 bar / 73psi
80
180 - 210
5 bar / 73psi
25mm
100
200 - 240
5 bar / 73psi
120
300 - 380
5 bar / 73psi
160
400 - 480
5 bar / 73psi
30mm
160
320 - 400
5 bar / 73psi
45mm
160
230 - 350
5 bar / 73psi
