Torch Assembly And Work Lead - Lincoln Electric TOMAHAWK 375 AIR Service Manual

THEORY OF OPERATION
E-8 E-8
FIGURE E.8 - TORCH ASSEMBLY AND WORK LEAD
TORCH ASSEMBLY AND WORK
LEAD
The torch assembly and work lead are connected
directly to the inverter board, inside the machine, using
printed circuit board fast-on connections. This torch is
designed to provide the best cutting performance and
excellent consumable life.
The torch head components are the electrode, swirl
ring, nozzle, retaining cap and spacer. This torch has a
lift pilot arc striking system which means that during the
idle state the electrode and nozzle are touching and
shorted together. As soon as the torch trigger is acti-
vated the pilot current flows through the electrode and
nozzle. When the air flow arrives at the torch head the
electrode is "pulled" back and the pilot arc is estab-
lished between the electrode and nozzle. As the torch
is brought closer to the work the pilot arc transfers to
the work piece and the cutting arc is established.
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
TOMAHAWK ® 375 AIR