Northern Industrial Tools ST80i User Manual

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Northern Industrial Welding

Operating Instructions and Parts Manual ST80i

Please read and save these instructions. Read through this owner’s manual carefully before
using product. Protect yourself and others by observing all safety information, warnings, and
cautions. Failure to comply with instructions could result in personal injury and/or damage to
product or property. Please retain instructions for future reference.

Welding

Description

ST80i portable DC inverter arc
welder ，AC single phase 120V (110­120V), 60HZ . 20 amp time delayed
fuse or circuit breaker is recommended,
Overload protection. An ideal stick unit
to weld all sorts of carbon steel,
stainless steel and DIY jobs.Tig torch
option available

Unpacking

1.1 Remove cartons, bags or
Styrofoam containing the welder and accessories.

1.2 Check the contents with the packing list below.

1.3 After unpacking unit, inspect carefully for any damage that may have
occurred during transit. Check for loose, missing, or damaged parts. Shipping
damage claim must be filed with carrier.

Portable Arc Welder 1 unit
Welding cable with electrode holder 1pc
Grounding cable with earth clamp 1pc
Operator’s Manual 1set
Sample electrodes 1 bag
Carry strap 1pc

ITEM QTY.

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Northern Industrial Welding

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Operating Instructions and Parts Manual

ST80i

Specifications and Dimension

MODEL ST80i

Power supply (v) 1ph-120V-60HZ
No-load voltage (v) 75V
Output Range (A) 20-75A 90A Peak
Duty cycle (%) 20% @75A
Suggested electrode E6013,E7014,E7018, Stainless steel
Electrode Diameter (Inch)

Dimensions
Length x Width x Height
Weight (Ibs) 4.5Kgs 9.9Lbs

Know your Welder

Power Indicating light

1/16”, 5/64”, 3/32”（1.6mm，2.0mm，2.4mm）
300x120x240MM / 12x5x9 inches

Thermal protection
Indicatin

light

Strap

Current adjustment

Welding cable and

electrode holder

Output“-”connector

Output“+”connector

Ground Cable

and clam

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.

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.

2

MAX/MIN
Switch

Thermal Indi

Ground Ca

Northern Industrial Welding

Operating Instructions and Parts Manual

ST80i

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

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Northern Industrial Welding

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.

-Always keep a fire extinguisher

accessible to your welding
environment.

-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.

1.3 Use of Your Welder

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.

ST80i

-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.

-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

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

4

Electrical Shock

Electric arc welders can
produce a shock that
can cause injury or

Northern Industrial Welding

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.

-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.

-The fumes emitted from some

metals when heated are extremely

ST80i

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

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

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