ESAB CIGWELD Transmig 255i Operating Manual page 29

OPERATING MANUAL
4. Amperage Control (Wirespeed)
The amperage control knob adjusts the amount of welding current delivered by the power source. In
MMAW (stick) and GTAW (TIG) modes, the amperage control knob directly adjusts the power inverter to
deliver the desired level of output current. In GMAW/FCAW modes (MIG), the amperage knob adjusts the
speed of the wire feed motor (which in turn adjusts the output current by varying the amount of MIG wire
delivered to the welding arc). The optimum wire speed required will dependent on the type of welding
application. The setup chart on the inside of the wire feed compartment door provides a brief summary
of the required output settings for a basic range of MIG welding applications.
NOTE!
The preview functionality provided on this power source is intended to act as a guide only. Some differences may be
observed between preview values and actual welding values due to factors including the mode of welding, differences
in consumables/gas mixtures, individual welding techniques and the transfer mode of the welding arc (ie dip versus
spray transfer). Where exact settings are required (in the case of procedural work), it is recommended that alternate
measurement methods be utilised to ensure output values are accurate.
5. MIG Torch Adaptor (Euro Style)
The MIG torch adaptor is the connection point for the MIG welding torch. Connect the torch by pushing
the torch connector into the brass torch adaptor firmly and screwing the plastic torch nut clockwise to
secure in position. To remove the MIG Torch simply reverse these directions.
6. Positive Welding Output Terminal
The positive welding terminal is used to connect the welding output of the power source to the appropriate
welding accessory such as the MIG torch (via the MIG torch polarity lead), electrode holder lead or work
lead. Positive welding current flows from the power source via this Dinse type terminal. It is essential,
however, that the male plug is inserted and turned securely to achieve a sound electrical connection.
CAUTION
!
Loose welding terminal connections can cause overheating and result in the male plug being fused in the Dinse terminal.
7. MIG Torch Polarity Lead
The polarity lead is used to connect the MIG torch to the appropriate positive or negative output terminal
(allowing polarity reversal for different welding applications). In general, the polarity lead should be
connected in to the positive welding terminal (+) when using steel, stainless steel or aluminium electrode
wire. When using gasless wire, the polarity lead is generally connected to the negative welding terminal (-).
If in doubt, consult the manufacturer of the electrode wire for the correct polarity. It is essential, however,
that the male plug is inserted and turned securely to achieve a sound electrical connection.
CAUTION
!
Loose welding terminal connections can cause overheating and result in the male plug being fused in the Dinse terminal.
8. Negative Welding Output Terminal
The negative welding terminal is used to connect the welding output of the power source to the
appropriate welding accessory such as the MIG torch (via the MIG torch polarity lead), TIG torch or
work lead. Negative welding current flows to the power source via this heavy duty Dinsetype terminal.
It is essential, however, that the male plug is inserted and turned securely to achieve a sound electrical
connection.
CAUTION
!
Loose welding terminal connections can cause overheating and result in the male plug being fused in the Dinse terminal.
Manual 0-5550
Transmig 220i
Transmig 255i Transmig 255i
4-3 OPERATION