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gas passage of the welding torch is blocked.
4. Poor sealing of gas passage or lower gas purity will also give rise to welding quality trouble.
5. Strong air flow in the environment may also lead to deterioration of welding quality.
B
、
Difficulty in arc starting with easy arc breaking
：
1. Make sure that the tungsten electrode in use is of good quality as discharge ability of inferior
tungsten electrode may fail the requirement
；
2. Tungsten electrode without sharpening treatment is also unable to start arc and leads to unstable
arc.
C
、
Output current can’t reach the rated value
：
Deviation of power voltage from the rated value will lead to unconformity of output current value
with the set value. When power voltage is lower than the rated value, maximum output current of the
welder may also be lower than the rated value.
D
、
Unstable current in the operation of the welder
：
This may be attributed to the following factors
：
1. Change in grid voltage
；
2. Interference from the power grid or other power equipments.
E
、
：
Severely burn of the tungsten needle
The duty cycle is adjusted too large, causing emission from the workpiece to the tungsten electron for
too long, resulting in severe heat of the tungsten needles.
F
、
The oxide film can’t be torn when welding aluminum:
1. the welding gear is selected wrong.
2. The duty cycle is adjusted too small;
3. The secondary inverter has field pipe damage.
G
、
The abnormal pilot lamp is on:
1
、
The light is on when the welder work abnormally, please turn off the power switch and then
reboot the machine, it can continue to use if it return to normal,
2
、
If the light is on repeatedly, please refer to the professional or the manufacturer for repair.
