Section 4 - Operation; Controls; Cutting Speed - Hobart AirForce 625 Manual

4-1. Controls

4
1 Output Control
Use control to set cutting output.
Place control in Gas/Air Set position to safely
adjust gas/air pressure. Only gas/air circuit
is activated.
2 Status Lights (See Section 5-2)
3 Power Light

4-2. Cutting Speed

400
350
300
250
200
150
100
50
0
16GA
(0.060)
Mild Steel Thickness(inches)
SECTION 4 – OPERATION
6
5
4 Power Switch
.
The fan will normally run for
approximately 5 seconds after power
switch is placed in the Off position.
5 Pressure Gauge
6 Pressure Adjustment Knob
1/8th 1/4th 3/8th
.
At ambient temperatures below –55 C
(235
pressure regulator may be necessary
(see Section 3-12).
Use only clean, dry air with 90 to 150 psi
(620 to 1035 kPa) pressure. Prevent
moisture from entering air supply at
extreme cold temperatures.
5/8th
1
3
2
Ref. 211 048
F), readjustment of gas/air
The cutting speed curve shows the
recommended maximum cutting
speed capabilities of the power
source and torch for mild steel of
various thickness.
The best cut quality is achieved by
cutting near the chart line. Cutting
below the line (too slow) will result
in excess dross. Cutting above the
line (too fast) will cause blowback
and lack of penetration.
OM-926 Page 17