· - 9 -
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 3L/min.
3. Check if torch is in block.
4. If gas circuit 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. When use MMA welding, too much spatter:
1. Maybe current is too big and stick’s diameter is too small.
2. Output terminal polarity connection is wrong, it should apply the opposite polarity at the normal technique, which
means that the stick should be connected with the negative polarity of power source, and work piece should be
connected with the positive polarity. So please change the polarity.
To Next Page
Loading...
