zika I-TIG 200AC/DC II User Manual page 15

AC TIG welding
1. When put the switch to "AC" position, it is AC arc welding, which can be for aluminum materials.
2. Pulse duty knob: During AC arc welding, current transfers between up side and down side continuously.
When current goes from tungsten stick to work piece, it is positive current time. At this moment, stick
heats slightly and quantity of heat is concentrated, which is good for welding. When current goes from
work piece to stick, it is down side current. At this moment, it can clean oxide at the surface of work
force, which improve welding result. But the stick may be burnt out because of over heat; the knob is for
adjusting time ratio of positive and reversed current. When at "O" position, the ratio is 50% to 50%; at
"5" position, ratio is 80%, and at "-5" position, ratio is 20%; Turn towards clockwise, up side current gets
short, down side current gets long. When turn counter-clockwise, it is opposite.
3. Operating as the10-12 step above.
Notice:
1) Big current should use small pulse duty; Above 200A, use pulse duty below 30%. At small current,
use big pulse duty; below 100A, use pulse duty above 50%.
2) When at AC TIG welding, the smallest current is not easy for arc initiation, please set the current to
20A.
MMA welding
1. Put the welding switch to " Down position", at this time, "Pulse choosing switch", "2T/4T switch", "AC/DC
switch" are out of work, only welding current knob can use.
2. Set the welding current according to the work piece thickness.
Attached Relative value for electrode and current
Warning:
It is forbidden to pull out or put in the cable or connector during the process of welding,
which will threat life safety and damage the machine.
Electrode(mm)
Current (A)
2.5 3.2
70-100 100-140
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