Polarity Change; Shielding Gas; Volt-Ampere Curves - ESAB EMP 205ic AC/DC Instruction Manual

5 OPERATION
5.3

Polarity change

Figure 3. Polarity changeover connections
1. Polarity changeover 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
mixed gas (Ar + CO ) or trimix (He + Ar + CO
2
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
0463 652 001
) or 100% carbon dioxide (CO
2
2
- 24 -
). Stainless steel can be welded with
2
). Aluminum and silicon bronze use pure argon
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