Tweco 211i Thermal Arc Fabricator - Manual (Page 43)

INSTALLATION/SETUP FABRICATOR 211i
Manual 0-5157 3-11 INSTALLATION/SETUP
4. Wirespeed/Amperage Control
In MIG mode, the Wirespeed/Amperage control 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 depends upon the material type and the welding application. The setup chart on the inside of the wire feed
compartment door provides a brief summary of the required settings for a basic range of MIG (GMAW/FCAW)
welding applications.
In STICK and LIFT TIG modes, the Wirespeed/Amperage control knob adjusts the amount of amperage (weld cur-
rent) delivered to the welding arc by the Power Source. It directly adjusts the Power Source to deliver the desired
level of weld current.
NOTE
The preview functionality provided on this power source is intended to act as a guide only. Some differ-
ences 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 utilized to ensure output
values are accurate.
5. MIG Gun Adapter (Tweco Style)
The MIG Gun adapter is the connection point for the Tweco Fusion MIG Gun. Connect the MIG Gun by pushing the
MIG Gun connector into the brass MIG Gun Adapter firmly and screw the locking screw in the MIG Gun Adapter
within the Wire Feed Compartment to secure the Tweco Fusion MIG Gun in position. Failure to properly lock the
Tweco MIG Gun into the MIG Gun Adapter will result in the Tweco Fusion MIG Gun being pushed out of the MIG
Gun Adapter by the MIG welding wire or lack of shielding gas (porosity in the weld) at the weld zone. To remove
the MIG gun 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 gun (via the MIG polarity lead), electrode holder lead or work lead. Positive welding
current flows from the power source via this heavy duty bayonet 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
bayonet terminal.
7. MIG Polarity Lead
The polarity lead is used to connect the MIG gun 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 aluminum electrode wire. When using gasless
wire, the polarity lead is generally connected to the negative welding terminal (-). If in doubt, consult the manu-
facturer 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
bayonet terminal.