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
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
such as: Digital Meter, Presettable control, Auto
Balance™, Fan As Needed (F.A.N.) and Timers for
fixed Preflow 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
includes the following:
• MicroStart™ II
• Auto-Balance optimized
• Menu button added
• Spot On selection added

PIPE THAWING

The Precision TIG
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
®
375 is part of a new family of indus-
®
II Technology, Presettable
TM
375 includes advanced features
®
375 has enhanced Features which
®
375 is not recommended for pipe
®
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