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OPERATORS’ MANUAL · TIG SERIES
14
6. FAQ
The phenomena listed below may be caused by the accessory you use, the working environment or the power
supply condition. Try to improve the working environment to avoid such occurrence.
◆
Black weld bead
This indicates that the weld bead is not well protected and is oxidized. Please check the following
points.
1) Make sure the gas valve of the cylinder is open and the pressure inside the cylinder is sufficient.
Generally, it is necessary to refill the cylinder when the pressure is lower than 0.5MPa.
2) Check if the gas flow is normal. You may select different gas flow according to welding current
value. However low the current is, the gas flow is recommended to be not less than 5L/min. Otherwise,
the weld bead may not be fully covered for lack of shielded gas.
3) Make sure the gas path is not blocked. Check if there is gas output from the nozzle of the welding
torch with your hand.
4) Check if the gas path is airproof and if the gas is pure enough.
5) Check if the environment is with strong wind.
6) Check if the pulse duration ratio is too low.
◆ Arc is hard to start but easy to break.
1) Make sure the electrode you use is of good quality, because the electrode of bad quality may not
meet the discharge requirement.
2) Make sure the electrode is sharpened, because arc is hard to ignite and unstable when using the
unsharpened electrode.
◆ Unstable current during welding
This may be caused by the following:
1) Mains voltage fluctuates badly.
2) There is serious interference from other electric appliances.
7. CAUTION
7.1 Working environment
1) Welding should be carried out in dry environment with its humidity not greater than 90%.
2) The temperature of the working environment should be between -10℃ to 40℃.
3) Avoid welding in the open air unless sheltered from sunlight and rain. Keep it dry anytime and do
not place it on wet ground or in puddles.
4) Avoid welding in dusty area or environment with corrosive chemical gas.
5) Gas shielded arc welding should be operated in environment without strong wind.
7.2 Safety tips
Overvoltage, overcurrent and overheating protection circuit are installed in this machine. If the output
current or the temperature inside the machine is too high, the machine will stop automatically. However,
excessive use (e.g. too high voltage) of machine may also damage the machine, so please note:
1) Ventilation
This welder can create powerful welding current that has strict cooling requirements. Therefore the
two built-in fans are very important in enabling the machine to work stable with effective cooling.
The operator should make sure that the louvers be uncovered and unblocked. The minimum distance between
the machine and nearby objects should be 30cm. Good ventilation is of critical importance to the normal
performance and lifespan of the machine.
2) Overload is forbidden.
Remember to observe the max load current at any moment (refer to the corresponding duty cycle). Make
sure that the welding current should not exceed the max load current. Overload could obviously shorten
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