Peration; Safety Precautions; Product Description; Pipe Thawing - Lincoln Electric PRECISION TIG 375 Operator's Manual

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SAFETY PRECAUTIONS

Read and understand this entire section before operat-
ing the machine.
WARNING
ELECTRIC SHOCK can kill.
• Only qualified personnel should
perform this installation.
• Turn the input power OFF at the
disconnect switch or fuse box.
• Do not touch electrically live parts
or electrode with skin or wet cloth-
ing.
• Insulate yourself from work and
ground.
• Always wear dry insulating gloves.
• Read and follow "Electric Shock
Warnings" in the Safety section if weld-
ing must be performed under electrical-
ly hazardous conditions such as weld-
ing in wet areas or on or in the work-
piece.
FUMES AND GASES
can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
WELDING SPARKS
can cause fire or
explosion
• Keep flammable material away.
• Do not weld on containers that
have held combustibles.
ARC RAYS
can burn.
• Wear eye, ear and body
protection.
Observe additional Safety Guidelines detailed in
the beginning of this manual.
OPERATION

PRODUCT DESCRIPTION

The Precision TIG 375 is part of a new family of indus-
trial arc welding power sources providing constant cur-
rent, single range square wave AC/DC TIG (GTAW)
with patented Micro-Start
Min. and Max. Output controls, and built-in high fre-
quency stabilization for continuous AC TIG and DC TIG
starting. It also has AC/DC Stick (SMAW) capability,
with adjustable Arc Force availability. A TIG Pulse
Panel, Power Factor Capacitors and a Water Solenoid
are available as field installed optional kits. Also, a new
Undercarriage (with double gas bottle rack) is available
for field installation, as well as a new Under-Cooler
Cart, which is also included in an available efficiently
integrated entire TIG Welding Package with conve-
nient built-in storage provisions for welding equipment
and components.
The Precision TIG 375 includes advanced features
such as: Digital Meter, Presettable control, Auto
Balance™, Fan As Needed (F.A.N.) and Timers for
fixed Peflow and variable Postflow shielding gas. Also
2-Step/4-Step and Pulse TIG operation with adjustable
Downslope Time control advanced controls are includ-
ed. The model still features a Stick stud panel and a
universal TIG torch connection box for simultaneous,
but separated, electrode outputs.
The Precision TIG 375 has enhanced Features which
includes the following:
• MicroStart™ II
• Auto-Balance optimized
• Menu button added
• Spot On selection added

PIPE THAWING

The Precision TIG 375 is not recommended for pipe
thawing.

Duty Cycle

The duty cycle is based upon a 10-minute time period;
i.e., for 40% duty cycle, it is 4 minutes welding and 6
minutes idling. If the rated duty cycle is significantly
exceeded, the thermostatic protection will shut off the
output until the machine cools to a normal operating
temperature. (Refer to Specification Section A-1)
PRECISION TIG 375
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II Technology, Presettable
TM