Harbor Freight Tools 91110 Owner's Manual
INVERTER ARC WELDER -
Model
91110
80 AMP
SET UP AND OPERATING INSTRUCTIONS
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright© 2004 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any
artwork contained herein may be reproduced in any shape or form without the express written
consent of Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due
to continuing improvements, actual product may differ slightly from the product described herein.
For technical questions or replacement parts, please call 1-800-444-3353.
Revised 08b
SPECIFICATIONS
Electrical Input 120 V~ / 60 Hz / 20 A
Power Cord: 12 Gauge With 3-Prong Plug
Thermal Overload Protection
Electrode Sizes 1/16” - 3/32” (1.6mm) - (2.5mm)
Duty Cycles 35% @ 80 A
60% @ 65 A
100% @ 50 A
Electrode Cable 6 Gauge x 6’ Long
Ground Clamp Cable 6 Gauge x 5’6” Long
Overall Dimensions 9-1/2” x 5-5/8” x 3-3/4”
Additional Features Amber Temperature Warning Light
Welding Capacity 6 Gauge Steel
SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures, parts list and assembly
diagram. Keep your invoice with this manual. Write the invoice number on the inside
of the front cover. Keep this manual and invoice in a safe and dry place for future reference.
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List are
included. If any parts are missing or broken, please call Harbor Freight Tools at the
number shown on the cover of this manual as soon as possible.
GENERAL SAFETY RULES
WARNING Read all safety
warnings and instructions.
Failure to follow the warnings and
instructions may result in electric
shock, re and/or serious injury.
WORK AREA
Keep your work area clean and 1.
well lit. Cluttered benches and dark
areas invite accidents.
Do not operate power tools in 2.
explosive atmospheres, such as in
the presence of ammable liquids,
gases, or dust. Power tools create
sparks which may ignite the dust or
fumes.
Keep bystanders, children, and 3.
visitors away while operating a
power tool. Distractions can cause
you to lose control. Protect others
in the work area from debris such as
chips and sparks. Provide barriers or
shields as needed.
Page 2SKU 91110 For technical questions, please call 1-800-444-3353.
ELECTRICAL SAFETY
Grounded tools must be plugged 1.
into an outlet properly installed
and grounded in accordance with
all codes and ordinances. Never
remove the grounding prong or
modify the plug in any way. Do
not use any adapter plugs. Check
with a qualied electrician if you
are in doubt as to whether the
outlet is properly grounded. If the
tools should electrically malfunction
or break down, grounding provides a
low resistance path to carry electricity
away from the user.
Double insulated tools are 2.
equipped with a polarized plug
(one blade is wider than the other).
This plug will t in a polarized out-
let only one way. If the plug does
not t fully in the outlet, reverse
the plug. If it still does not t, con-
tact a qualied electrician to install
a polarized outlet. Do not change
the plug in any way. Double insula-
tion eliminates the need for the
three wire grounded power cord and
grounded power supply system.
Avoid body contact with grounded 3.
surfaces such as pipes, radiators,
ranges, and refrigerators. There is
an increased risk of electric shock if
your body is grounded.
Do not expose power tools to rain 4.
or wet conditions. Water entering
a power tool will increase the risk of
electric shock.
Do not abuse the Power Cord.5.
Never use the Power Cord to carry
the tools or pull the Plug from an
outlet. Keep the Power Cord away
from heat, oil, sharp edges, or
moving parts. Replace damaged
Power Cords immediately. Dam-
aged Power Cords increase the risk
of electric shock.
When operating a power tool out-6.
side, use an outdoor extension
cord marked “W-A” or “W”. These
extension cords are rated for outdoor
use, and reduce the risk of electric
shock.
PERSONAL SAFETY
Stay alert. Watch what you are do-1.
ing, and use common sense when
operating a power tool. Do not use
a power tool while tired or under
the inuence of drugs, alcohol, or
medication. A moment of inattention while operating power tools may
result in serious personal injury.
Dress properly. Do not wear loose 2.
clothing or jewelry. Contain long
hair. Keep your hair, clothing, and
gloves away from moving parts.
Loose clothes, jewelry, or long hair
can be caught in moving parts.
Avoid accidental starting.3. Be sure
the Power Switch is off before
plugging in. Carrying power tools
with your nger on the Power Switch,
or plugging in power tools with the
Power Switch on, invites accidents.
Remove adjusting keys or wrench-4.
es before turning the power tool
on. A wrench or a key that is left at-
tached to a rotating part of the power
tool may result in personal injury.
Do not overreach. Keep proper 5.
footing and balance at all times.
Proper footing and balance enables
Page 3SKU 91110 For technical questions, please call 1-800-444-3353.
better control of the power tool in
unexpected situations.
Use safety equipment. Always 6.
wear eye protection. Always wear
ANSI-approved safety glasses under
a properly shaded welding helmet.
Respirator, leather work shoes with
rubber soles, hard hat or hearing pro-
tection must be used for appropriate
conditions.
TOOL USE AND CARE
Use clamps (not included) or other 1.
practical ways to secure and sup-
port the work piece to a stable
platform. Holding the work by hand
or against your body is unstable and
may lead to loss of control.
Do not force the tool. Use the cor-2.
rect tool for your application. The
correct tool will do the job better and
safer at the rate for which it is de-
signed.
Do not use the power tool if the 3.
Power Switch does not turn it on
or off. Any tool that cannot be con-
trolled with the Power Switch is dan-
gerous and must be replaced.
Disconnect the Power Cord Plug 4.
from the power source before
making any adjustments, changing
accessories, or storing the tool.
Such preventive safety measures
reduce the risk of starting the tool ac-
cidentally.
Maintain tools with care. Keep cut-6.
ting tools sharp and clean. Prop-
erly maintained tools with a sharp
cutting edge are less likely to bind
and are easier to control. Do not use
a damaged tool. Tag damaged tools
“Do not use” until repaired.
Check for misalignment or binding 7.
of moving parts, breakage of parts,
and any other condition that may
affect the tool’s operation. If damaged, have the tool serviced before
using. Many accidents are caused
by poorly maintained tools.
Use only accessories that are 8.
recommended by the manufacturer for your model. Accessories
that may be suitable for one tool may
become hazardous when used on
another tool.
SERVICE
Tool service must be performed 1.
only by qualied repair personnel.
Service or maintenance performed by
unqualied personnel could result in
a risk of injury.
When servicing a tool, use only 2.
identical replacement parts. Follow instructions in the “Inspec-
tion, Maintenance, And Cleaning”
section of this manual. Use of
unauthorized parts or failure to follow
maintenance instructions may create
a risk of electric shock or injury.
Store idle tools out of reach of chil-5.
dren and other untrained persons.
Tools are dangerous in the hands of
untrained users.
SPECIFIC SAFETY RULES
Maintain a safe working environ-1.
ment. Keep the work area well lit.
Make sure there is adequate surrounding workspace. Always keep
Page 4SKU 91110 For technical questions, please call 1-800-444-3353.
the work area free of obstructions,
INHALATION HAZARD:
Welding and Plasma Cutting Produce
TOXIC FUMES.
Exposure to welding or cutting
exhaust fumes can increase the risk
of developing certain cancers, such as
cancer of the larynx and lung cancer.
Also, some diseases that may be linked
to exposure to welding or plasma cutting
exhaust fumes are:
• Early onset of Parkinson’s Disease
• Heart disease • Ulcers
• Damage to the reproductive organs
• Inammation of the small intestine or
stomach • Kidney damage
• Respiratory diseases such as
emphysema, bronchitis, or pneumonia
Use natural or forced air ventilation and
wear a respirator approved by NIOSH to
protect against the fumes produced to
reduce the risk of developing the above
illnesses.
grease, oil, trash, and other debris.
Do not use the Inverter Arc Welder
in areas near ammable chemicals,
dusts, and vapors.
Maintain labels and nameplates 2.
on the Inverter Arc Welder. These
carry important information. If unreadable or missing, contact Harbor
Freight Tools for a replacement.
Never plug the Power Cord of this 3.
product into an electrical outlet
while standing on a wet or damp
surface.
Do not unplug the Inverter Arc 4.
Welder by pulling on the Power
Cord. Keep the Power Cord away
from heated surfaces.
drugs. If there is any doubt, do not
attempt to use this product.
WARNING
Always turn off the Inverter Arc 5.
Welder and unplug the unit from
its electrical outlet before performing any inspection, maintenance,
or cleaning procedures.
Never leave the Inverter Arc Weld-6.
er unattended when it is plugged
into an electrical outlet. Make sure
to unplug it from its electrical outlet
before leaving the area.
Do not allow children to handle or 7.
play with this product.
Store idle equipment.8. When not in
use, tools and equipment should be
stored in a dry location to inhibit rust.
Always lock up tools and equipment,
and keep out of reach of children.
Do not use this product if under 9.
the inuence of alcohol or drugs.
Read warning labels on prescriptions to determine if your judgement
or reexes are impaired while taking
Use eye, skin, and breathing pro-11.
tection. Always wear ANSI approved
safety glasses with side shields under
an ANSI approved welding helmet.
Wear re resistant work gloves, a
heavy, long-sleeved shirt, trousers
without cuffs, high top leather work
boots to protect skin from arc rays
and metal sparks. Also wear an ANSI
approved air respirator.
REV 04e
Page 5SKU 91110 For technical questions, please call 1-800-444-3353.
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