Mac Afric MMA 315G, User Manual

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17
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. Arc-striking is difficult and easy to pause:
1. Make sure quality of tungsten electrode is high.
2. If the electrode is not dried, it will cause unstable arc, welding defect increases and the quality is
down.
3. If use extra-long cable, the output voltage will decrease, so please shorten the cable.
B. Output current is 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.
C. Current is not stabilizing when machine is being operated:
This may be caused by the following factors:
1. Electric wire net voltage has been changed.
2. There is harmful interference from electric wire net or other equipment.
D. Too much spatter during MMA welding:
1. Maybe current is too heavy while welding rod diameter is too small:
2. Output terminal polarity connection is wrong. The positive connection should be applied at the
normal technique, that is to say, welding rod connects with the negative polarity while the work piece
with the positive polarity. So please change the polarity.