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5 OPERATION
5.3
MMA welding
MMA welding may also be referred to as welding with covered electrodes. The arc
melts the electrode as well as a local part of the workpiece. The coverage, when
melting, forms a protective slag and creates a shielding gas to protect the weld pool
from atmospheric contamination.
For MMA welding the power source shall be supplemented with:
•
welding cable with electrode holder
•
return cable with clamp
5.4
Connecting welding and return cables
The power source has two outputs, a positive welding terminal (+) and a negative welding terminal (-),
for connecting welding and return cables. The output to which the welding cable is connected depends
on the welding method or type of electrode used.
Connect the return cable to the other output on the power source. Secure the return cable's contact
clamp to the workpiece, and make sure that there is a good contact between the workpiece and the
output for the return cable on the power source.
•
For TIG welding, the negative welding terminal (-) is used for the welding torch and the positive
welding terminal (+) is used for the return cable.
•
For MMA welding, the welding cable can be connected to the positive welding terminal (+) or
negative welding terminal (-), depending on the type of electrode used. The connection polarity is
stated on the electrode packaging.
5.5
Turning the power on/off
Turn on the power by turning the switch to the "ON" (I) position.
Turn the unit off by turning the switch to the "O" position.
Whether the power supply is interrupted or the power source is switched off in the normal manner,
weld programs are stored so that they are available the next time the unit is started.
CAUTION!
Do not turn off the power source during welding (with load).
0463 862 001
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© ESAB AB 2023
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