4. There is a ground terminal on the back of each welding machine, whose
symbol is the earthing mark. Before working starts, connect the casing of the
machine with the ground with a wire whose sectional area is 10mm
2
to avoid
static electricity or electric leakage that can cause failure.
5. During working, do not touch the output terminal with bare hands to avoid
electric shock.
4.3
．
Matters needing attention during cutting
1. Hold the cutting torch with your hands and press the switch when you are
preparing to cut. If this moment there is plasma arc blowing out from the
nozzle bore, the electrode and the nozzle are correctly installed. If no
plasma or only weak plasma arc blows out from the nozzle bore, the
electrode and the nozzle are incorrectly installed and need reinstalling after
the machine is turned off.
2. The external rim of the nozzle bore should aim at the edge of the workpiece
when cutting begins. Press the switch of the cutting torch to strike arc. If the
arc is not stricken, release the switch and press it again. After the arc is
successfully stricken, move the cutting torch at a uniform speed to conduct
normal cutting (The speed varies according to the thickness of the plate. If
the sparks upwell, it indicates that the moving speed is too high and the
workpiece is not cut to full depth so that the moving speed should be
adjusted).
3. The cutting speed should be slowed down when cutting comes to the end
and the workpiece is about to be broken. Release the switch of the cutting
torch and cutting is finished.
4. If splashing matters adhere to the surface of the nozzle and affect the
cooling result, they should be cleaned without delay. In addition, the dust
and splashing matters on the head of the cutting torch should be often
cleaned so that the effect of heat elimination can be kept.
5. The wheel carrier of the cutting torch is for the purpose of keeping the
distance between the end face of the nozzle and the plate. It is strictly
forbidden to dismount the wheel carrier of the cutting torch. Otherwise the
distance between the end face of the nozzle and the plate cannot be
ensured and may cause the nozzle to contact the plate to burn the cutting
torch.
6. Replacement of the electrode and the nozzle
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