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5 OPERATION
0463 618 001
- 26 -
© ESAB AB 2019
5.3
Polarity change
The unit’s power source is delivered with the polarity changeover cable connected to the
positive terminal. Some wires, e.g. self-shielded cored wires, are recommended to be welded
with negative polarity. Negative polarity means that the polarity changeover cable is
connected to the negative terminal and the return cable remains as the connection for the
torch return-cable. Check the recommended polarity for the welding wire you want to use.
Refer to electrode packaging for information relating to the correct electrode polarity. The
polarity can be changed by moving the polarity changeover cable to suit the applicable
welding process.
5.4
Shielding gas
The choice of suitable shielding gas depends on the material. Typically, mild steel is welded
with mixed gas (Ar + CO
2
) or 100% carbon dioxide (CO
2
). Stainless steel can be welded with
mixed gas (Ar + CO
2
) or trimix (He + Ar + CO
2
). Aluminum and silicon bronze use pure argon
gas (Ar). In the sMIG mode (see "sMIG mode" section in the "CONTROL PANEL" chapter),
the optimal welding arc with the gas used will be automatically set.
5.5
Volt-ampere curves
The curves below show the maximum voltage and amperage output capabilities of the power
source for three common welding process settings. Other settings result in curves that fall
between these curves.
A
= Welding current (AMPS),
V
= Output voltage
5.5.1
1ph Volt-ampere curves
5.5.1.1
SMAW (Stick) 120 V, 1ph
Содержание EMP 285ic 1ph
Страница 27: ...5 OPERATION 0463 618 001 27 ESAB AB 2019 5 5 1 2 SMAW Stick 230 V 1ph 5 5 1 3 GMAW MIG 120 V 1ph ...
Страница 28: ...5 OPERATION 0463 618 001 28 ESAB AB 2019 5 5 1 4 GMAW MIG 230 V 1ph 5 5 1 5 GTAW TIG 120 V 1ph ...
Страница 77: ...ROLLER WIRE GUIDE SELECTION 0463 618 001 77 ESAB AB 2019 ...