WARPP LGK-40 Instruction Manual - page 8

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