WARPP LGK-40 Instruction Manual - page 9

The electrode and nozzle should be replaced when: 

(1)  The consumption depth of the hafnium wire of the electrode is over 1.5mm; 

(2)  The diameter of aperture of the nozzle is irregularly out of shape; 

(3)  The cutting speed obviously slows down and green flare emerges in the arc; 

(4)  It is hard to strike arc; 

(5)  The cut is skew or widen. 

The electrode and the nozzle should be simultaneously replaced without delay; 

otherwise strong arc will emerge inside the nozzle and break down the electrode 

and the nozzle or even burn the cutting torch out. The nozzles are different if the 

models are different so that the model uniformity should be kept when the 

nozzle is replaced. 

7.  During cutting, the cable line should be kept as fully as possible. Even if the 

space is too limited, dog leg should be avoided. Do not step on or extrude 

the cable line in order to avoid gas suffocate and gas inadequacy that may 

burn the cutting torch out. The cable line should be prevented from 

contacting with sharp things so as to avoid breakage. 

8.  Dismount the nozzle casing, the nozzle, the electrode and the pilot arc line 

(if the pilot arc line is not removed the cutting torch will be burned out). 

Press down the switch after the machine is started up and this moment there 

is gas blowing out from the hole of the air injector to clean the soil inside the 

air injector. It should be cleaned once every day after used, which lasts 

about 15s each time. 

9.  The head of the cutting torch should not be used as a knocking tool. 

5. Maintenance 

1.  Periodically get rid of the dust with dry and clean compress air. If the welding 

machine is used in environments with heavy smoke and serious polluted air, 

dust elimination should be conducted at least once a month. 

2.  The pressure of the compressed air should be adjusted down to the value 

required to prevent from damaging the small components in the machine. 

3. Examine whether the electrical continuity places are well contacted 

(especially the socket connectors). Reinforce the loosen connection points. 

If there are oxidation phenomena, erase the oxide film with sandpaper and 

reconnect them.