14
3.7 Replacement of electrode and nozzle
When the phenomena below occur, the electrode and nozzle should be replaced. Otherwise,
there will be strong arc in the nozzle, which will break down the electrode and the nozzle, or even
burn the torch. Nozzles of different models are different, so ensure the nozzle is of the same
model when replacing it.
Electrode wear
＞
1.5mm
Distortion of the nozzle
Cutting speed declining, arc with green flame
Difficult in arc ignition
Irregular cut
0.25
0.5
0.5
0.5
25
20
15
5
0.1
0.3
0.3
0.3
3.3
2.9
3.3
2
0.7
0.7
10
1.1
0.95
1.1
0.6
30
35
40
0.1
0.1
0.1
0.1
0.1
0.38
0.65
0.65
0.65
0.15
0.1
Cutting thickness
(
mm
)
Mild steel
Galvanized steel
Stainless steel
Aluminum
Brass
Red copper
Table 3-4: Cutting speed
(
in
)
when cutting current is 100A
m/m
0.25
0.5
0.5
0.5
25
20
15
5
0.1
0.3
0.3
0.3
3.3
2.9
3.3
2
0.7
0.7
10
1.1
0.95
1.1
0.6
30
35
40
0.1
0.1
0.1
0.1
0.1
0.38
0.65
0.65
0.65
0.15
Cutting thickness
(
mm
)
Mild steel
Galvanized steel
Stainless steel
Aluminum
Brass
Red copper
Table 3-3: Cutting speed
(
in
)
when cutting current is 80A
m/m
