90 AMP Flux Wire Welder
94056
Set uP And OPerAting inStructiOnS
distributed exclusively by Harbor Freight tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
read this material before using this product.
Failure to do so can result in serious injury.
SAVe tHiS MAnuAl.
Copyright© 2005 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. Tools required for
assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
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for which it was intended. Do not
use inappropriate attachments in an
attempt to exceed the tool capacity.
11. disconnect power. Unplug tool
when not in use.
12. remove adjusting keys and
wrenches. Check that keys and
adjusting wrenches are removed
from the tool or machine work surface
before plugging it in.
6. use the right tool for the job. Do
not attempt to force a small tool or
attachment to do the work of a larger
industrial tool. There are certain
applications for which this tool was
designed. Do not modify this tool and
do not use this tool for a purpose for
which it was not intended.
13. Avoid unintentional starting. Be
sure the switch is in the Off position
when not in use and before plugging
in. Do not carry any tool with your
finger on the trigger, whether it is
plugged in or not.
7. dress properly. Do not wear loose
clothing or jewelry as they can be
caught in moving parts. Protective,
electrically nonconductive clothes and
nonskid footwear are recommended
when working. Wear restrictive hair
covering to contain long hair.
14. Stay alert. Watch what you are
doing, use common sense. Do not
operate any tool when you are tired.
15. check for damaged parts. Before
using any tool, any part that appears
damaged should be carefully checked
to determine that it will operate
8. use eye and ear protection. Always
wear ANSI-approved, arc-shaded,
impact safety face shield. Always use
the full face shield when welding.
Wear a NIOSH-approved dust mask
or respirator when working around
metal, chemical dusts, fumes and
mists.
properly and perform its intended
function. Check for alignment and
binding of moving parts; any broken
parts or mounting fixtures; and any
other condition that may affect proper
operation. Any part that is damaged
should be properly repaired or
replaced by a qualified technician. Do
not use the tool if any switch does not
turn On and Off properly.
9. do not overreach. Keep proper
footing and balance at all times. Do
not reach over or across running
machines.
10. Maintain tools with care. Keep
tools sharp and clean for better
and safer performance. Follow
instructions for lubricating and
changing accessories. Inspect tool
cords periodically and, if damaged,
have them repaired by an authorized
technician. The handles must be
kept clean, dry, and free from oil and
grease at all times.
16. guard against electric shock.
Prevent body contact with grounded
surfaces such as pipes, radiators,
ranges, and refrigerator enclosures.
17. replacement parts and
accessories. When servicing, use
only identical replacement parts.
Use of any other parts will void the
warranty. Only use accessories
intended for use with this tool.
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Approved accessories are available
from Harbor Freight Tools.
WArning
18. do not operate tool if under the
influence of alcohol or drugs.
Read warning labels on prescriptions
to determine if your judgment or
reflexes are impaired while taking
drugs. If there is any doubt, do not
operate the tool.
inHAlAtiOn HAzArd:
Welding and Plasma cutting Produce
tOxic FuMeS.
Exposure to welding or cutting
19. Maintenance. For your safety,
service and maintenance should be
performed regularly by a qualified
technician.
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:
20. use proper size and type
extension cord. If an extension cord
is required, it must be of the proper
size and type to supply the correct
current to the tool without heating
up. Otherwise, the extension cord
could melt and catch fire, or cause
electrical damage to the tool. This
tool requires use of an extension cord
of 20 amps minimum capability (up
to 30 feet), with wire size rated at 12
AWg. Longer extension cords require
larger size wire. If you are using the
tool outdoors, use an extension cord
rated for outdoor use (signified by
“WA” on the jacket).
• Early onset of Parkinson’s Disease
• Heart disease
• Ulcers
• Damage to the reproductive organs
• Inflammation 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.
22. Avoid breathing fumes or gases.
They can cause serious health
problems. Use an active ventilation
system directly above the welding
area. Keep your head out of the
fumes.
21. Avoid electrical shock. Do not
permit electrically live parts, cables,
or electrodes to contact skin, clothing,
or gloves. Protective clothing should
be hole-free, dry, and ANSI-approved.
This unit draws enough current to
cause serious injury or death. Before
turning the welder on, check the
electrode holder to be sure that there
are no protruding screw heads, and
that all insulation is secure. Do not
weld unless you are insulated from
ground and the work piece.
23. Avoid eye and body damage.
Welding rays and infrared radiation
can injure eyes and burn skin.
Wear ANSI-approved eye and body
protection. Do not allow viewing by
visitors without proper eye and body
protection. Use a face shield with arc-
shaded filter plate.
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24. Know proper welding practices.
Read and understand the
unPAcKing
When unpacking, check to make sure
the item is intact and undamaged. If any
parts are missing or broken, please call
Harbor Freight Tools at 1-800-444-3353 as
soon as possible.
manufacturer’s instructions, as well
as your employer’s safety practices
for welding.
25. connect only to a code approved
power source. Connect only to a
grounding power source conforming
to the National Electrical Code and
Local Codes.
ASSeMbly
cover (31)
26. Avoid fire and explosion. Remove
flammable and explosive material
from at least 35 feet from the welding
site to prevent welding sparks or
molten metal from starting a fire.
Keep a type ABC fire extinguisher
within easy reach. Thoroughly clean
the object being welded of any paint,
grease, or other foreign material.
Handle (30)
Wire
reel (27)
cover
locking
Spring (8)
1. Attach the Handle (30) to the Cover
(31) using screw (29) inserted from the
Handle top-rear.
27. Avoid being burned. Always wear
ANSI-approved welding gear: leather
gloves, leather apron, and shoes.
2. Attach the Cover Locking Spring (8) to
the front of the Base Frame (14) using
the supplied self-tapping screw.
28. WARNING: This product, when used
for welding, plasma cutting, soldering,
or similar applications, produces
chemicals known to the State of
California to cause cancer and birth
defects (or other reproductive harm).
(California Health & Safety Code §
25249.5, et seq.)
29. the warnings, cautions, and
instructions discussed in this
instruction manual cannot cover
all possible conditions and
situations that may occur. it must
be understood by the operator that
common sense and caution are
factors which cannot be built into
this product, but must be supplied
by the operator.
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cOntrOlS
Overload indicator light (22)
Switch (7) current Min. / Max.
Switch (7) Power On / Off
torch (1) cable
Wire Feed Speed Knob (9)
Power cord (32)
ground cable (33)
duty cycle
OPerAtiOn
duty cycle is a welding equipment
This Welder is used to weld sheet
specification, which defines the number of metal and light carbon steel.
minutes, within a 10-minute period, during
which a given welder can safely produce
a particular welding current. For example,
this 90 amp welder with a 10% duty cycle
caution: Before welding, read and
understand all safety precautions and
warnings listed on pages 2 through 5.
must be rested for at least 9 minutes after
1 minute of continuous welding.
Clamp (33) as close as possible to
1. Securely clamp the Ground Cable
the metal object to be welded, or
to the metal work bench where the
object is mounted and electrically
connected.
Failure to carefully observe
duty cycle limitations can easily over
stress a welder’s power generation
system contributing to premature
welder failure. Many welders do not
have internal protection systems
that prevent this sort of over stress
2. Set the switch on the control panel to
MIN or MAX, as appropriate.
3. Verify that the Power Switch is in the
OFF position, then plug the Welder
plug into a dedicated, 110 VAC, 20
amp line with delayed action type
circuit breaker or fuses.
-- leaving the task to the owner or
operator.
If an extension cord is used, it must
have the following wire size: up to 30
feet, use 12 AWG size wire; 30 to 50
feet, use 10 AWG wire; Over 50 feet,
use 8 AWG wire.
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4. While holding the Torch Cable Clamp
with electrode wire clearly out of the
way of any grounded objects, turn the
Power Switch to the ON position.
speed dependent on the Min. or Max.
current setting.
note: If too much current is drawn from
the Welder, the Thermal Overload
protector will activate, the amber
indicator will light, and the Welder
will turn off until it cools down. If this
happens, turn the Power Switch to
the OFF position and wait about 3 ~ 5
minutes.
5. Momentarily press the Torch switch
to test the wire feed speed. Adjust
the speed by turning the Wire Feed
Speed Knob (9).
6. Orient yourself on the area to be
welded, then place a face shield over
your eyes.
9. When the weld is complete, lift the
electrode wire clearly away from any
grounded object, set the face shield
down, turn toward the Welder, and
turn the Power Switch to the OFF
position.
Warning: never look at the ignited
arc without AnSi-approved,
arc-shaded, eye protection in a
full face shield. Permanent eye
damage or blindness can occur.
Skin burns can occur. never
breathe welding fumes.
10. Unplug the Power Cord from the
electrical outlet.
7. Press (and hold) the Torch button and
stroke the area to be welded with the
electrode wire to ignite the arc.
Never tap the electrode wire into the
welding surface to ignite the arc. This
damages its external coating on the
electrode which prevents oxygen
in the air from coming into contact
with the molten metal, causing it to
oxidize.
8. Once the arc is ignited, tilt the
electrode wire forward at an angle of
approximately 35°.
The wire feeds automatically at a
SKU 94056
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unwind wire t
MAintenAnce
caution: Before performing any
maintenance on the Welder, unplug
the Power Cord from the electrical
outlet.
Wire
Wire
Sheath
1. Periodically remove the Right and
Left side panels (12 and 13), and
using compressed air, blow out all
dust from the interior.
Wire reel
4. Place the new Wire Reel over the
shaft and onto the Reel Spring (24).
The wire on the reel should unwind
counterclockwise so that it comes off
the reel straight into the wire sheath,
as illustrated above.
2. Store in a clean and dry location.
replacing the Wire reel
When the wire on the Feed Reel is
used up, you will need to replace it as
follows.
5. Replace the Reel Locking Knob and
the Wing Nut. Tighten well.
Wire Feed
Arm (36a)
Wire Feed
Knob (37a)
6. Loosen the Wire Feed Knob (37a)
and swing it off the Wire Feed Arm
(36a) to remove tension.
7. If the end of the wire is crimped or
bent, cut it off. Guide at least 12
inches of wire into the Wire Sheath.
8. Swing the Wire Feed Knob (37a)
back onto the Wire Feed Arm (36a)
and tighten it until the spring starts to
compress.
Wire Sheath
1. Press on the Cover Locking Spring
(8), then lift the Cover (31) using
Handle (30) to expose the Wire Feed
Unit (23a).
9. Turn the Torch Handle Nozzle
counterclockwise and pull to remove.
2. Unscrew the Wing Nut (25) and
remove the Reel Locking Knob (26).
10. Turn the Contact Tip
counterclockwise and remove.
3. Remove the empty Wire Reel (27).
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11. Lay the Torch Sheath out in a straight
line so that the wire moves through it
easily.
PleASe reAd tHe
FOllOWing cAreFully
THE MANUFACTURER AND/OR DISTRIBUTOR
HAS PROVIDED THE PARTS DIAGRAM IN
THIS MANUAL AS A REFERENCE TOOL
ONLY. NEITHER THE MANUFACTURER NOR
DISTRIBUTOR MAKES ANY REPRESENTATION
OR WARRANTY OF ANY KIND TO THE BUYER
THAT HE OR SHE IS QUALIFIED TO MAKE
ANY REPAIRS TO THE PRODUCT OR THAT
HE OR SHE IS QUALIFIED TO REPLACE ANY
PARTS OF THE PRODUCT. IN FACT, THE
MANUFACTURER AND/OR DISTRIBUTOR
EXPRESSLY STATES THAT ALL REPAIRS
AND PARTS REPLACEMENTS SHOULD BE
UNDERTAKEN BY CERTIFIED AND LICENSED
TECHNICIANS AND NOT BY THE BUYER. THE
BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO
THE ORIGINAL PRODUCT OR REPLACEMENT
PARTS THERETO, OR ARISING OUT OF HIS OR
HER INSTALLATION OF REPLACEMENT PARTS
THERETO.
Warning: The following steps require
applying power to the welder. Do not
touch anything with the Torch Handle
or an arc may be ignited.
12. Plug the Power Cord into its electrical
outlet, press the Current Switch to
Max., and turn the welder ON.
13. Lift the Torch Handle and continue
pressing the Trigger until the wire
feeds through two inches.
If the wire does not feed, view the
Wire Feed Unit and see if the wire
is being pushed. If it is not, turn the
welder OFF and tighten the Wire
Feed Knob (37a).
14. Turn the welder ON again and press
the Trigger.
15. Once the wire is exposed, turn the
welder OFF and unplug it.
16. Slide the Contact Tip over the wire
and screw it into Torch Handle.
17. Replace the Nozzle and cut off any
excess wire over two inches.
18. Secure the Cover.
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PArtS liSt And diAgrAMS
Parts list
Part
description
Qty.
1
1
1
1
1
1
2
1
Part
description
Qty.
1
1
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
Torch
20 Transformer
Contact Tip
21 Middle Partition Board
22 Overload Indicator Lamp
23a Wire Feed Unit
24 Reel Spring
25 Wing Nut M6
26 Reel Locking Knob
27 Wire Reel
Nozzle
Liner
Fixing Pole (A) for Gun Body
Fixing Pole (B) for Gun Body
Switch
Cover Locking Spring
Knob
1
28 Reel Holder
1
10 Nut
1
1
1
1
1
4
4
4
29 Screw, ST 4.2 x 25
30 Handle
31 Cover
1
1
1
1
1
1
1
1
11 Speed Control Circuit Board
12 Right Side Panel
13 Left Side Panel
14 Base Frame
15 Foot
16 Washer
17 Screw, ST 4.2 x 13
18 Transformer Carriage
19 Thermostat
32 Power Cord
33 Ground Cable
34 Wire Feed Roller
35 Wire Feed Bearing
36a Wire Feed Arm
37a Wire Feed Knob
2
1
1
record Product’s Serial number Here:
note: If product has no serial number, record month and year of purchase instead.
note: Some parts are listed and shown for illustration purposes only, and are not
available individually as replacement parts.
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Assembly diagram
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Welder Assembly Photographs
28
24
23a
20
19
11
36a
37a
35
34
23a
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Wiring Schematic
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of the complaint must accompany the
merchandise. If our inspection verifies
the defect, we will either repair or replace
the product at our election or we may
elect to refund the purchase price if
we cannot readily and quickly provide
you with a replacement. We will return
repaired products at our expense, but if we
determine there is no defect, or that the
defect resulted from causes not within the
scope of our warranty, then you must bear
the cost of returning the product.
liMited 1 yeAr / 90 dAy
WArrAnty
Harbor Freight Tools Co. makes
every effort to assure that its products
meet high quality and durability standards,
and warrants to the original purchaser
that for a period of ninety days from date
of purchase that the torch, liner, wire feed
mechanism (if applicable), welding clamps,
electrode holders, cables and accessories
packed with the welder are free of defects
in materials and workmanship. this
limited 90 day/1 year Warranty shall
not apply to consumable parts such
as tips, welding wire, and gas nozzles.
Harbor Freight Tools also warrants to the
original purchaser, for a period of one year
from date of purchase, that the transformer
and rectifier are free from defects in
This warranty gives you specific legal
rights and you may also have other rights
which vary from state to state.
3491 Mission Oaks Blvd. • PO Box
6009 • Camarillo, CA 93011 • (800)
444-3353
materials and workmanship (90 days if
used by a professional contractor or if
used as rental equipment). This warranty
does not apply to damage due directly or
indirectly to misuse, abuse, negligence or
accidents, repairs or alterations outside
our facilities, normal wear and tear, or to
lack of maintenance. We shall in no event
be liable for death, injuries to persons
or property, or for incidental, contingent,
special or consequential damages arising
from the use of our product. Some states
do not allow the exclusion or limitation
of incidental or consequential damages,
so the above limitation of exclusion may
not apply to you. THIS WARRANTY IS
EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS.
To take advantage of this warranty,
the product or part must be returned to
us with transportation charges prepaid.
Proof of purchase date and an explanation
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