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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Specifications and Dimension
MODEL
ST80i
Power supply (v)
1ph-120V-60HZ
No-load voltage (v)
Output Range (A)
Duty cycle (%)
75V
20-75A 90A Peak
20% @75A
Suggested electrode
Electrode Diameter (Inch)
E6013,E7014,E7018, Stainless steel
1/16”, 5/64”, 3/32”（1.6mm，2.0mm，2.4mm）
Dimensions
Length x Width x Height
300x120x240MM / 12x5x9 inches
Weight (Ibs)
4.5Kgs
9.9Lbs
Thermal protection
Indicating light
Know your Welder
MAX/MIN
Switch
Power Indicating light
Strap
Current adjustment
Welding cable and
electrode holder
Output“-”connector
Output“+”connector
Ground Cable
and clamp
Indicating Light（Power, Thermal Protection）
There are two indicating lights : power indicator and thermal indicator. When the
machine is turned on, the power indicator will be on to show it. When the thermal
indictor is on, it shows the machine is overloaded working and the internal
temperature is too high. The machine will turn off automatically but the fan will
still be working. When the internal temperature is decreased, the machine will
turn on automatically.
Thermal Indic
Ground Cab
Current Adjustment
Current adjustment is on the front panel of machine. It is an infinite current output
adjustment
Output “+“Connector
This is the connector for welding cable most often when STICK welding. When
this machine is used for TIG welding, this connector is for the grounding cable.
Ground Cable and Clamp
The ground cable and clamp is attached to the work piece to complete the flow of
current needed to weld.
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Welding Cable and Electrode Holder
One end of cable is connected to output connectors of the machine. The
electrode is clamped in the electrode holder for welding.
Output “-” Connector
This is the connector for grounding cable when STICK welding. When this
machine is used for TIG welding, this connector is for the TIG torch
Power Cord
The power cord connects the welder to the 110-120v volt power supply.
Plug the 15 amp plug into a 115 volt/20 amp receptable to supply power
to the welder
Wiring Diagrams
3
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
General Safety Information
1.1 Your Welding Environment
-Keep the environment you will be
welding in free from flammable
materials.
-Follow the instructions in this manual.
-Keep welder in the off position when
not in use.
-Connect ground lead as close to the
area being welded as possible to
ensure a good ground.
-Always keep a fire extinguisher
accessible to your welding
environment.
-Do not allow any body part to come
in contact with the electrode if you are
in contact with the material being
welded, ground or electrode from
another welder.
-Do not weld if you are in an awkward
position. Always have a secure
stance while welding to prevent
accidents. Wear a safety harness if
working above ground.
-Do not drape cables over or around
your body.
-Wear a full coverage helmet with
shade (see ANSI Z87.1 safety
standard) and safety glasses while
welding.
-Wear proper gloves and protective
clothing to prevent your skin from
being exposed to hot metals, UV and
IR rays.
-Do not overuse or overheat your
welder. Allow proper cooling time
between duty cycles.
-Always use this welder in the rated
duty cycle to prevent excessive heat
and failure.
1.4 Specific Areas of Danger, Caution or
Warning
-Always have a qualified person
install and operate this equipment.
-Make sure the area is clean, dry and
ventilated. Do not operate the welder
in humid, wet or poorly ventilated
areas.
-Always have your welder maintained
by a qualified technician in
accordance with local, state and
national codes.
-Always be aware of your work
environment. Be sure to keep other
people, especially children, away
from you while welding.
-Keep harmful arc rays shielded from
the view of others.
-Mount the welder on a secure bench
or cart that will keep the welder
secure and prevent it from tipping
over or falling.
1.2 Your Welder’s Condition
-Check all cables, power cord and
welding cable to be sure the
insulation is not damaged. Always
replace or repair damaged
components before using the welder.
-Check all components to ensure they
are clean and in good operating
condition before use.
Electrical Shock
1.3 Use of Your Welder
Electric arc welders can
produce a shock that
can cause injury or
Do not operate the welder if the
output cable, electrode, or any part
of the system is wet. Do not immerse
them in water. These components
and the welder must be completely
dry before attempting to use it.
death. Touching electrically live parts
can cause fatal shocks and severe
burns. While welding, all metal
components connected to the unit are
electrically hot. Poor ground
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
connections are a hazard, so secure
the ground lead before welding.
-Wear dry protective apparel: coat,
shirt, gloves and insulated footwear.
-Insulate yourself from the work piece.
Avoid contacting the work piece or
ground.
- Do not attempt to repair or maintain
the welder while the power is on.
-Inspect all cables and cords for any
exposed wire and replace
immediately.
-Use recommended replacement
cables and cords.
-Always attach ground clamp to the
work piece work table as close to the
weld area as possible.
-Do not touch the electrode and the
ground or grounded work piece at the
same time.
toxic. Refer to the material safety
data sheet for the manufacturer’s
instructions.
-Do not weld near materials that will
emit toxic fumes when heated.
Vapors from cleaners, sprays and
degreasers can be highly toxic when
heated.
UV and IR Arc Rays
The welding arc
produces ultraviolet (UV)
and infrared (IR) rays
that can cause injury to your eyes
and skin. Do not look at the welding
arc without proper eye protection.
-Always use a helmet that covers
your full face from the neck to top of
head and to the back of each ear.
-Use a lens that meets ANSI
standards and safety glasses. For
welders under 160 Amps output, use
a shade 10 lens; for above 160 Amps,
use a shade 12. Refer to the ANSI
standard Z87.1 for more information.
-Cover all bare skin areas exposed to
the arc with protective clothing and
shoes. Flame-retardant cloth or
leather shirts, coats, pants or
-Do not use a welder to thaw frozen
pipes.
Fumes and Gases
-Fumes emitted from the
welding process displace
clean air and can result in
injury or death.
-Do not breathe in fumes emitted by
the welding process. Make sure your
breathing air is clean and safe.
-Work only in a well-ventilated area or
use a ventilation device to remove
welding fumes from the environment
where you will be working.
-Do not weld on coated materials
(galvanized, cadmium plated or
containing zinc, mercury or barium).
They will emit harmful fumes that are
dangerous to breathe. If necessary
use a ventilator, respirator with air
supply or remove the coating from the
material in the weld area.
coveralls are available for protection.
-Use screens or other barriers to
protect other people from the arc rays
emitted from your welding.
-Warn people in your welding area
when you are going to strike an arc
so they can protect themselves.
Fire Hazards
Do not weld on containers
or pipes that contain or
have had flammable,
gaseous or liquid
combustibles in
them. Welding creates sparks and
heat that can ignite flammable and
-The fumes emitted from some
metals when heated are extremely
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
explosive materials.
shield, welder’s hat and ear plugs to
keep sparks out of ears and hair.
Electromagnetic Field
-Do not operate any electric arc
welder in areas where flammable or
explosive materials are present.
-Remove all flammable materials
within 35 feet of the welding arc. If
removal is not possible, tightly cover
them with fireproof covers.
-Take precautions to ensure that
flying sparks do not cause fires or
explosions in hidden areas, cracks or
areas you cannot see.
-Keep a fire extinguisher close in the
case of fire.
-Wear garments that are oil-free with
no pockets or cuffs that will collect
sparks.
-Do not have on your person any
items that are combustible, such as
lighters or matches.
-Keep work lead connected as close
to the weld area as possible to
prevent any unknown, unintended
paths of electrical current from
causing electrical shock and fire
hazards.
-Electromagnetic fields
can interfere with various
electrical and electronic
devices such as pacemakers.
-Consult your doctor before using any
electric arc welder or cutting device
-Keep people with pacemakers away
from your welding area when welding.
-Do not wrap cable around your body
while welding.
-Wrap welding cable and ground
cable together whenever possible.
-Keep welding cable and ground
cables on the same side of your body.
Shielding Gas Cylinders
Can Explode
High pressure cylinders can explode
if damaged, so treat them carefully.
-Never expose cylinders to high heat,
sparks, open flames, mechanical
shocks or arcs.
Hot Materials
-Do not touch cylinder with welding
cable.
-Do not weld on the cylinder.
-Always secure cylinder upright to a
cart or stationary object.
-Keep cylinders away from welding or
electrical circuits.
-Use the proper regulators, gas hose
and fittings for the specific application.
-Do not look into the valve when
opening it.
Welded materials are hot
and can cause severe
burns if handled
improperly.
-Do not touch welded materials with
bare hands.
-Do not touch electrode holder after
welding until it has had time to cool
down.
Sparks/Flying Debris
-Use protective cylinder cap
whenever possible.
1.5 Proper Care, Maintenance And
Repair
Welding creates hot
sparks that can cause
injury. Chipping slag off
welds creates flying debris.
-Wear protective apparel at all times:
ANSI-approved safety glasses or
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
-Always have power disconnected
when working on internal
components.
- Do not touch or handle PC board
without being properly grounded
with a wrist strap. Put PC board in
static proof bag to move or ship.
-Do not put hands or fingers near
moving parts such as fan.
extension cord it must be a #12
gauge cord at the smallest.
-Do not use an extension cord over
25 ft. in length.
Assembly
This unit is assembled when out of
factory.
3. Setting up the work piece
3.1 Welding positions
Installation
1. Power requirement
There are two basic positions, for
welding: Flat and Horizontal. Flat
welding is generally easier, faster,
and allows for better penetration. If
possible, the work piece should be
positioned so that the bead will run on
a flat surface.
AC single phase 120v (110-120V),
60HZ fused with a 20amp time
delayed fuse or circuit breaker is
required. DO NOT OPERATE THIS
UNIT if the ACTUAL power source
voltage is less than 105 volts ac or
greater than 132 volts ac.
3.2 Preparing the Joint
Before welding, the surface of work
piece needs to be free of dirt, rust,
scale, oil or paint. Or it will create
brittle and porous weld. If the base
metal pieces to be joined are thick or
heavy, it may be necessary to bevel
the edges with a metal grinder. The
correct bevel should be around 60
degrees. See following
• High voltage danger from power
source! Consult a qualified
electrician for proper installation of
receptacle. This welder must be
grounded while in use to protect
the operator from electrical shock.
• Do not remove grounding prong
or alter the plug in any way. Do
not use any adapters between the
welder’s power cord and the power
source receptacle. Make sure the
POWER switch is OFF when
picture:
connecting your welder’s power
cord to a properly grounded
120Vac, 60Hz, single phase, 20
amp power source.
2. Extension cord
During normal use an extension cord
is not necessary. It is strongly
Based on different welding position,
there are different welding joint, see
following images for more information
recommended that an extension cord
should not be used because of the
voltage drop they produce. This drop
in voltage can affect the performance
of the welder. If you need to use an
7
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Used for out of position and tacking.
6. Selecting the proper electrode
There is no golden rule that
determine the exact rod or heat
setting required for every situation.
The type and thickness of metal and
the position of the work piece
determine the electrode type and the
amount of heat needed in the welding
process. Heavier and thicker metals
required more amperage. It is best to
practice your welds on scrap metal
which matches the metal you intend
to work with to determine correct heat
setting and electrode choice. See
following some helpful trouble
shooting tips to determine if you are
using a correct electrode
4. Ground clamp connection
Clear any dirt, rust, scale, oil or paint
on the ground clamp. Make certain
you have a good solid ground
connection. A poor connection at the
ground clamp will waste power and
heat. Make sure the ground clamp
touches the metal.
1. When proper rod is used:
a. The bead will lay smoothly over
the work without ragged edges
b. The base metal puddle will be as
deep as the bead that rises
above it
c. The welding operation will make
a crackling sound similar to the
sound of eggs frying
2. When a rod too small is used：
a. The bead will be high and
irregular
b. The arc will be difficult to
maintain
5. Electrode
The welding electrode is a rod coated
with a layer of flux. When welding,
electrical current flows between the
electrode (rod) and the grounded
metal work piece. The intense heat of
the arc between the rod and the
grounded metal melts the electrode
and the flux. The most popular
electrodes are:
-E6011 60,000 PSI tensile strength
deep penetrating applications.
-E6013 60,000 PSI tensile strength
used for poor fit up applications
-E7014 70,000 PSI tensile strength
used for high deposition and fast
travel speeds with light penetration
-E7018 70,000 PSI tensile strength,
3. When the rod is too large：
a. The arc will burn through light
metals
b. The bead will undercut the work
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
c. The bead will be flat and porous
d. Rod may be freeze or stick to
work piece
Note: Rate of travel over the work
also affects the weld. To ensure
proper penetration and enough
deposit of rod, the arc must be moved
slowly and evenly along the weld
seam.
necessary to hold the electrode
perpendicular to the work piece.
Once the arc is started the angle of
the electrode in relation to the work
piece should be between 10 and 30
degrees. This will allow for good
penetration, with minimal spatter.
2.2 Striking the arc
Operation
EXPOSURE TO A WELDING ARC
IS EXTREMELY HARMFUL TO THE
EYES AND SKIN.
• Never strike an arc or begin
welding until you have adequate
protection.
• Wear flameproof welding gloves,
heavy long-sleeved shirt, cuffless
trousers, high-topped shoes and a
welding helmet or shield.
Scratch the work piece with the end
of electrode to start arc and then
raise it quickly about 1/8 inch gap
between the rod and the work piece.
See following picture：
1. Setting the amperage control
The welder has an infinite output
current control. It is capable of
welding with 1/16" and 5/64" and
3/32" electrodes.
There is no golden rule that
determines the exact amperage
required for every situation. It is best
to practice your welds on scrap metal
which matches the metals you intend
to work with to determine correct
setting for your job. The electrode
type and the thickness of the work
piece metal determine the amount of
heat needed in the welding process.
Heavier and thicker metals require
more voltage (amperage), whereas
lighter and thinner metals require less
voltage (amperage).
2. Welding techniques
The best way to teach yourself how to
weld is with short periods of practice
at regular intervals. All practice welds
should be done on scrap metal that
can be discarded. Do not attempt to
make any repairs on valuable
equipment until you have satisfied
yourself that your practice welds are
of good appearance and free of slag
or gas inclusions.
It is important that the gap be
maintained during the welding
process and it should be neither too
wide or too narrow. If too narrow, the
rod will stick to the work piece. If too
wide, the arc will be extinguished.
It needs much practice to maintain
the gap. Beginners may usually get
sticking or arc extinguishing. When
the rod sticks to the work piece,
gently rock it back and forth to make
them separate. If not, the circuit is
short connection, and it will overload
the welder.
2.1 Holding the electrode
The best way to grip the electrode
holder is the way that feels most
comfortable to you. To Position the
Electrode to the work piece when
striking the initial arc it may be
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
A good arc is accompanied by a crisp,
cracking sound. The sound is similar
to that made by eggs frying. To lay a
weld bead, only 2 movements are
required; downward and in the
direction the weld is to be laid, as in
following figure:
Flat position is the easiest of the
welding positions and is most
commonly used. It is best if you can
weld in the flat position if at all
possible as good results are easier to
achieve.
The horizontal position is
performed very much the same as
the flat weld except that the angle is
different such that the electrode, and
therefore the arc force, is directed
more toward the metal above the
weld joint. This more direct angle
helps prevent the weld puddle from
running downward while still allowing
slow enough travel speed to achieve
good penetration. A good starting
point for your electrode angle is about
30 degrees DOWN from being
2.3 Types of weld bead
The following paragraphs discuss the
most commonly used arc welding
beads.
The stringer bead Formed by
traveling with the electrode in a
straight line while keeping it centered
over the weld joint.
perpendicular to the work piece.
The weave bead Used when you
want to deposit metal over a wider
space than would be possible with a
stringer bead. It is made by weaving
from side to side while moving with
the electrode. It is best to hesitate
momentarily at each side before
weaving back the other way to
improve penetration.
2.5 Judge a good weld bead
When the trick of establishing and
holding an arc has been learned, the
next step is learning how to run a
good bead. The first attempts in
practice will probably fall short of
acceptable weld beads. Too long of
an arc will be held or the travel speed
will vary from slow to fast (see
following)
2.4 Welding position
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
and other exposed parts of the
body with protective garments, or
if possible, work with a shield
between the body and the work
piece.
The intense heat produced at the arc
sets up strains in the metal joined by
welding. Peening the weld not only
removes the scale left behind in the
welding but relieves the internal
strains developed by the heating and
cooling process. With the
A. Weld speed is too fast.
B. Weld speed is too slow.
C. Arc is too long.
D. Ideal weld.
A solid weld bead requires that the
electrode be moved slowly and
steadily along the weld seam. Moving
the electrode rapidly or erratically will
prevent proper fusion or create a
lumpy, uneven bead. To prevent
ELECTRIC SHOCK, do not perform
any welding while standing, kneeling,
or lying directly on the grounded work.
2.6 Finish the bead
As the coating on the outside of the
electrode burns off, it forms an
envelope of protective gasses around
the weld. This prevents air from
reaching the molten metal and
creating an undesirable chemical
reaction. The burning coating,
however, forms slag. The slag
formation appears as an
hammer/brush after it is cooled.
Maintenance
The welder needs regular
maintenance as following:
Periodically clean dust, dirt, grease,
etc. from your welder. Every six
months, or as necessary, remove the
cover panel from the welder and air-
blow any dust and dirt that may have
accumulated inside the welder.
Replace power cord, ground cable,
ground clamp, or electrode assembly
when damaged or worn.
MINOR AND ROUTINE
MAINTENANCE
Store in a clean dry
accumulation of dirty metal scale on
the finished weld. Slag should be
removed by striking the weld with a
chipping hammer.
facility free from corrosive gas,
excess dust and high humidity.
Temperature range from 10°F–
120°F and the relative humidity not
more than 90%.
PEENING THE SLAG FROM A
WELD JOINT CAUSES SMALL
CHIPS OF METAL TO FLY
When transporting or storing the
welder after use, it is recommended
to repack the product as it was
received for protection. (Cleaning is
required before storage and you must
seal the plastic bag in the box for
storage
THROUGH THE AIR
• Metallic chips flying through the
air can cause eye injury or injury to
other parts of the head, hands or
exposed portions of the body.
• Wear goggles or eye glasses with
side shields and protect the hands
11
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Trouble shooting Chart
No. Breakdown
Analysis
Solutions
Poor ventilation leads to
over-heat protection
Internal temperature is
too high
Improve ventilation
Will automatically recover
when the temperature
lowers.
Yellow
1
Indicator is
on
Using over the rated
duty-cycle
Will automatically recover
when the temperature
lowers.
The
adjustment
knob on
the front
panel didn’t
work
Potentiometer broken
(current regulation)
Replace the
2
potentiometer.
Switch broken
Replace the switch
Cooling
Fan not
working or
turning
Fan broken
Replace or repair the fan
Check connections
3
4
Wire broken or fallen off
very slowly
Over voltage, under
voltage
See No. 1
See No. 1
No no-load
voltage
Welder getting
overheated
Switch broken
Replace the switch
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Electrode Holder’s
Replace with a higher
Amperage Holder
Electrode
Holder and
Cable
capacity is too small;
Replace it with another
one in conformity with the
requirement
Cable is of small size
Socket loosen
getting
5
hot;“+” “-”
polar
High resistance between
the electrode holder and
the cable
Remove the oxide coating
and tighten it
sockets
becoming
hot
Resume power over a
long period of time
Not a failure. Trip caused
by the main power filter’s
capacity charging. Switch
on the main power
source.
Power
source
tripping
(more than two days)
6
7
In the process of welding Contact us
Contact us
Others
13
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Warranty
LIMITED ONE-YEAR WARRANTY
Should this product fail to perform satisfactorily due to a defect or poor
workmanship within ONE YEAR from the date of purchase, return it to
the place of purchase and it will be replaced, free of charge. Incidental or
consequential damages are excluded from this warranty.
Repair Parts List
Reference
number
Description
Handle
Part number
2.05.08.118
Qty
1
1
2
3
4
5
6
7
8
Enclosure
1.1.01.01.0148
1.1.05.02.0288
2.05.05.701
1
PCB
1
Plastic front panel
Switch (RoHS)
“-“ output cable
“+“ output cable
Front assembly
1
2.07.11.017
1
1.2.08.02.2108
1.2.08.01.1604
1.2.01.01.3645
1
1
1
14
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
Dins connector
(copper)（ROHS）
Thermal protection
9
2.07.57.147
1.2.07.02.3010
1.2.07.02.3011
1.1.03.04.0137
1.1.01.04.0340
1.2.07.02.3008
1.1.05.03.0025
2
1
1
2
1
1
1
10
Indicating light
11
12
13
14
15
Power Indicating light
Output fixed board
Bottom panel
Temperature relay
Driver module
（ROHS）
Intermediate-
frequency transformer
（120V）
16
2.07.25.819
1
Transformer fixed
board
Fan wiring harness
17
18
19
20
21
1.1.02.01.0750
1.2.07.02.0614
2.05.05.702
1
1
1
1
1
（ROHS)
Plastic back panel
Powerline with plug
2.03.05.133
（RoHS）
Wave switch (ROHS)
2.07.80.213
Other Safety and Standards Information
This manual is designed to inform the operator of safety and general use of this
model only. For further information about welding safety refer to the following
standards and comply with them where applicable.
• ANSI Standard Z49.1 — SAFETY IN
WELDING AND CUTTING obtainable
from: American Welding Society 550 NW
Le Jeune Road, Miami, FL 33126
Tel. (800) 443-9353
Fax (305) 443-7559
15
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Northern Industrial Welding
ST80i
Operating Instructions and Parts Manual
• ANSI Standard Z87.1 — SAFE PRACTICE
FOR OCCUPATION AND EDUCATIONAL
EYE AND FACE PROTECTION
Obtainable from: American National
Standards Institute (ANSI) 11 West 42nd
St. New York, NY 10036
Tel. (212) 642-4900
• NFPA Standard 51B — CUTTING AND
WELDING PROCESS obtainable from:
National Fire Protection Association,
1 Batterymarch Park, P.O. Box 9101
Quincy, MA 02269-9101
Tel. (617) 770-3000
• OSHA Standard 29 CFR, Part 1910,
Subpart Q. —WELDING, CUTTING AND
BRAZING obtainable from your state
OSHA office or from: U. S. Dept. of Labor
OSHA, Office of Public Affairs Room
N3647, 200 Constitution Ave. NW
• CSA Standard W117.2 — Code for
SAFETY IN WELDING AND CUTTING
Obtainable from: Canadian Standards
Association, 178 Rexdale Blvd.,
Etobicoke, Ontario M9W 1R3
• American Welding Society Standard A6.0
—WELDING AND CUTTING CONTAINERS
WHICH HAVE HELD COMBUSTIBLES
Obtainable from: American
Welding Society, 550 NW Le Jeune Road
Miami, FL 33126
Tel. (800) 443-9353
Fax (305) 443-7559
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