Questions To Be Run Into During Welding - zika I-TIG 200AC/DC II User Manual

QUESTIONS TO BE RUN INTO DURING WELDING

Fittings, welding materials, environment factor, supply powers maybe have something to do with welding.
User must try to improve welding environment.
A. Black welding spot
——Welding spot is not prevented from oxidizing .User may check as following:
1. Make sure the valve of argon cylinder is opened and its pressure is enough. Argon cylinder must be filled
up to enough pressure again if pressure of cylinder is below 0.5Mpa .
2. Check if the flow meter is opened and has enough flow .User can choose different flow according to
welding current in order to save gas .But too small flow maybe cause black welding spot because
preventive gas is too short to cover welding spot .We suggest that flow of argon must be kept min
5L/min.
3. Check if torch is in block.
4. If gas passage is not air-tight or gas is not pure can lower welding quality.
5. If air is flowing powerfully in welding environment, that can lower welding quality.
B. Arc-striking is difficult and easy to pause
1. Make sure quality of tungsten electrode is high.
2. Grind end of the tungsten electrode to taper .If tungsten electrode is not grinded ,that will be difficult to
strike arc and cause unstable arc .
C. Output current not to rated value
When power voltage departs from the rated value, it will make the output current not matched with rated
value; When voltage is lower than rated value, the max output may lower than rated value.
D. Current is not stabilizing when machine is being operated
It has something with factors as following:
1. Electric wire net voltage has been changed.
2. There is harmful interference from electric wire net or other equipment.
E. stick is burnt out
Pulse duty is too high, which lead to over heat of stick.
F. When welding aluminum, can not break oxidized film
1. Wrong welding value
2. Pulse duty too low
3. Twice inverter MOSFET broken.
18