Northern Industrial Tools Welding System 164612 User Manual

MIG 175  
Item# 164612  
OPERATOR’S MANUAL  
Read carefully and understand RULES FOR SAFE OPERATION and instructions before  
operating. Failure to follow the safety rules and other basic safety precautions may  
result in serious personal injury.  
MIG175WelderManualCover.indd  
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Operator’s Manual  
Read and save these instructions.  
Do not use your welder before reading this manual.  
INDEX  
1. General Welding Safety  
1.1 Your Welding Environment  
1.2 Your Welder’s Condition  
1.3 Use Of Your Welder  
2
2
2
2
3
4. Welder Specifications  
4.1 Technical Data  
8
8
4.2 Structure Of Welder  
4.3 Illustration Of Complete Assembly  
5. Installation  
8-9  
10  
10  
10  
10  
11  
11  
1.4 Specific Areas of Danger, Caution or  
Warning  
5.1 Electrical Connection  
5.2 Gas Connection  
1.4A Electrical Shock  
3
3
4
1.4B Fumes And Gases  
5.3 Wire Feed System Connection  
5.4 Gun Connection  
1.4C UV & IR Arc Rays  
1.4D Fire Hazards  
5.5 Connection Of The Gun Trigger Leads 11  
And Ground Cable  
1.4E Hot Materials  
4
5
5
5
5
5
6
6
6
6
6
6
7
1.4F Sparks, Flying Debris  
1.4G Electromagnetic Fields  
1.4H Shielding Gas, Cylinders Can Explode  
1.4I Proper Maintenance And Repair  
1.4J Proposition 65  
6. Operation  
11  
12  
12  
12  
12  
13  
13  
14  
15  
16  
16  
16  
17  
6.1 Work piece Cleaning Before Welding  
6.2 Adjustment And Test Before Welding  
6.3 Welding  
6.4 Maintenance And Service  
7. Troubleshooting  
7.1 Troubleshooting  
2. Product Description  
3. Technical Specifications  
3.1 Proper Environment For The Welder  
3.2 Requirement For Power Supply  
3.3 Standards For The Welder  
3.4 MIG Gun Illustration  
7.2 Common Weld Defects  
8. Circuit Chart  
9. Packing List  
10. Transport And Storage  
11. Quality Guarantee  
12. Illustrated Parts List  
3.5 Symbol Explanation  
Dear Owner:  
Thank you for purchasing the MIG 175 wire feed welder. It is designed to provide years of service  
for you.  
This manual is designed to help you safely and effectively operate your welder.  
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1. General Welding Safety  
WARNING!  
*Welding can cause serious injury or death. Only qualified people should operate, repair or install this welder.  
Read this manual before use of the welder.  
WARNING!  
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 prevent it from tipping over or  
falling.  
1.2 Your Welder’s Condition  
-Check all cables, power cord and MIG gun 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  
DANGER  
Do not operate the welder if the MIG gun, wire or wire feed system is wet. Do not immerse gun or wire in water.  
These components and the welder must be completely dry before attempting to use it.  
-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 welding wire 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.  
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-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.  
-Keep hands and fingers away from moving parts and stay away from the drive rolls.  
-Do not point MIG gun at any body part of yourself or anyone else.  
-Always use this welder in the rated duty cycle to prevent excessive heat and failure.  
1.4 Specific Areas of Danger, Caution or Warning  
1.4A Electrical Shock  
Electric arc welders can produce a shock that can cause injury or death. Touching electrically  
live parts can cause fatal shocks and severe burns. While welding, all metal components connected  
to the wire are electrically hot. Poor ground 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 welding wire and the ground or grounded work piece at the same time.  
-Do not use a welder to thaw frozen pipes.  
1.4B 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 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.  
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1.4C UV and IR Arc Rays  
WARNING  
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.  
1.4D Fire Hazards  
WARNING  
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 explosive  
materials.  
-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.  
-To prevent any unintended arcs, cut wire back to ¼" stick out after welding.  
1.4E Hot Materials  
WARNING  
Welded materials are hot and can cause severe burns if handled improperly.  
Do not touch welded materials with bare hands.  
Do not touch MIG gun nozzle after welding until it has had time to cool down.  
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1.4F Sparks/Flying Debris  
WARNING  
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 shield, welder’s hat and  
ear plugs to keep sparks out of ears and hair.  
1.4G Electromagnetic Fields  
WARNING  
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 MIG gun and ground cable together whenever possible.  
-Keep MIG gun and ground cables on the same side of your body.  
1.4H 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.  
-Do not touch cylinder with MIG gun.  
-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.  
-Use protective cylinder cap whenever possible.  
1.4I Proper Care, Maintenance And Repair  
-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 staticproof bag to move or ship.  
Do not put hands or fingers near moving parts such as drive rolls or fan.  
1.4J Proposition 65 Warnings  
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Welding and cutting equipment produces fumes or gases which contain chemicals known to the state of  
California to cause birth defects and, in some cases, cancer. (California Health & Safety code section 25249.5 et  
seq.)  
2. Product Description  
The MIG 175 welder is ready to weld with or without shielding gas. Flux cored arc welding (FCAW) uses a  
welding wire with flux contained on the inside of the wire. MIG or Gas Metal Arc Welding (GMAW) uses an  
external supply (cylinder) of shielding gas to shield the arc puddle from the atmosphere. Gases include CO2 and  
C-25 (75% Argon/25%CO2) for mild steel, a triple mix of Argon, CO2 and Helium for stainless steel and Argon,  
used for aluminum. In the welding process, an arc is created between the welding wire and work piece, melting  
the two materials and joining them together. The welding wire is continuously fed through the gun to the work  
piece, allowing the operator to concentrate on stick out (distance between the end of the wire and the work piece)  
and travel speed. The MIG 175 is designed to weld mild steel materials from 26 gauge to 3/16" and performs  
best using .023", .030" or .035" solid wire with C25 shielding gas or .030" and .035" flux cored or self shielding  
wire. It can weld stainless steel materials from 18 gauge to 11 gauge (1/8") and aluminum materials from 16  
gauge to 11 gauge (1/8").  
Features of the MIG 175 wire feed welder:  
Compact design includes the welder and wire feeder that fit in a small case for easy transport.  
Popular 230 Volt power input for maximum convenience.  
Ready to weld with or without shielding gas. Includes sample spool of flux cored wire to allow operator to  
weld out of the box.  
Low heat affected area when used with C25 and .023" wires for reduced distortion.  
Welds thinner materials (26 gauge) with .023" wire and C25 shielding gas.  
Welds up to 3/16" materials with .035" flux cored wires.  
Tweco style replacement nozzle, contact tips and adaptor for easy access to replacement parts.  
We reserve the right to change specifications without notification.  
3. Technical Specifications  
3.1 Proper Environment for Welder  
* The ambient temperature range: when welding: -14°F–104°F,  
during transport or in storage: -13F–131°F  
* Relative humidity: when at 104°F: 50%,  
when at 68°F: 90%.  
* The dust, acid and erodible materials in the air can not exceed the amount required by the norm (apart from the  
emissions from the welding process). No violent vibrations at the job site.  
* Do not use in the rain or other wet conditions.  
3.2 Required Power Supply  
* Input voltage should not exceed more than ±10% of the rated voltage.  
3.3 Standards for Welder  
MIG 175 is listed according to the following standard:  
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IEC 60974-1: 2000  
Arc welder safety requirement. Chapter 1: Welding Power source  
3.4 MIG Gun Illustration  
The MIG gun is composed of three components: Gun handle, cable and connector.  
Connector is the end that connects into the drive system and interfaces with the wire feeder and gas connection.  
Cable is covered with a nylon tube with a liner in the center of the hollow cable. The center section of the liner  
is where the welding wire is fed through. The space between liner and center of the cable is the passage for  
shielding gas. The wire in the cable carries the electrical current from the drive housing connector point to the  
contact tip.  
The welding gun handle has a curved gooseneck between the handle and the adaptor/nozzle/contact tip. Use  
nozzle gel to prevent buildup of slag on the inside of the nozzle. Do not hit gun nozzle on a solid object to remove  
slag buildup. Remove nozzle and scrape out or use a MIG gun pliers with specially designed tip to scrape out slag.  
The gas flows from the cylinder through the gas valve to the connecting point where the gun is connected with the  
cable to the contact tip. The gas is released through the gas valve when the gun trigger is engaged. The gas  
disperses through the adaptor into the nozzle to cover the molten weld puddle. In windy conditions, user must  
either block the wind or use flux core wire.  
Keep the MIG gun extended as straight as possible. Sharp turns in the gun cable will restrict wire feeding and  
affect the welding performance.  
Warning: * Power must be off when assembling or disassembling the gun to the drive housing or when  
replacing the nozzle, adaptor or contact tip.  
* Contact tips wear because of the wire passing through them and arcing, caused by electrical contact of  
the wire to the contact tip.  
* The liner should be replaced if dirty and causing friction to the wire feeding. If cable has been crushed  
or cut, it must be replaced.  
3.5 Symbol Explanations  
Ground  
Single phase  
DC  
X: Duty Cycle  
I1: Rated Input Current  
I2: Rated Welding Current  
P1: Rated Input Power  
U0: Rated No-Load Voltage  
U1: Rated Input Voltage  
U2: Rated Welding Voltage  
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60Hz: AC, Rated Frequency 60Hz  
V: Voltage (V)  
A: Current (A)  
KVA: Power (KVA)  
%: Continuous Loading Rate  
IP21S: Case Protection Class. ‘IP’ is the code of International Protection. ‘2’ means preventing user’s finger  
from touching dangerous parts; preventing solid material with a diameter no less than 12.5mm into the  
box. ‘1’ means preventing water falling vertically, which is harmless. ‘S’ means waterproof test is  
conducted while the movable parts are stationary.  
4. Welder Specifications  
4.1 Main Technical Data (See Table 1)  
Item  
Input Power  
MIG 175  
V
230 (220~240)  
Frequency  
Hz  
60  
Phase No.  
1
Rated No-Load Voltage  
Rated Input Current  
Rated Input Capacity  
Rated Duty Cycle  
V
A
35  
20  
KVA  
%
2.3  
20  
Rated Output Current/ Voltage  
Output Current Adjustment Range  
Cooling Type  
A/V  
A
130/20.5  
22~175  
Fan-Cooled  
17.3" x 10.2" x 14.4"  
20.5" x 12.2" x 16.1"  
49  
External Dimension: L x W x H  
Carton Dimension: L x W x H  
Inch  
Inch  
Lb.  
Weight  
4.2 Structure of Welder  
The MIG 175 portable wire feed welder case contains all the components of the welder.  
The right side has the wire feed assembly, spool hub, gun trigger connections and polarity connections.  
The left side houses the electrical components: transformer, reactor, current capacitor, cooling fan, controlling  
transformer, PCB, heat radiator and the rectifier bridge.  
The front panel contains the voltage and wire feed speed (amperage) control knobs, on/off switch, opening for the  
gun connection, cooling openings, ground cable and gun trigger connections.  
The back panel consists of the power cord, cooling opening and gas valve connection interface. (See the Chart  
below)  
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Top View  
Front View  
Left View  
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4.3 Illustration Of Complete Assembly  
5. Setup/Assembly  
ATTENTION: The protection class of the MIG 175 Portable Wire Feed Welder is IP21S. Do not insert any  
object that is less than 12.5 mm (especially a metal bar) into the welder. The case is not designed to be stood on  
or to have heavy objects placed on top of it.  
WARNING! Do not switch voltage while welding. Only the operator should adjust the welding parameters.  
WARNING! The welder must be grounded before using. Do not remove the ground earth clamp while welding or  
you may get an electric shock. When multiple welders are using a common grounding device, they must have a  
parallel connection and must not connect in series. The welder’s ground cable sectional area should not be smaller  
than the input power cable.  
Weld only in areas free from dust, chemicals, flammable or explosive gases and other similar substances.  
This welder is designed for use and storage indoors or in a covered area at 10°F–105°F. If used outside, unit  
should not be exposed to rain or high humidity.  
Only weld in a well-ventilated area where smoke and fumes can be avoided. Use a smoke ventilation device  
if necessary.  
5.1 Electrical Power  
* Plug in power cord to a 230 Volt 15 amp circuit..  
5.2 Shielding Gas Connection.  
* Read Gas Bottle Safety Section on proper care and handling of compressed gases.  
* Install regulator to gas bottle and connect the gas line between the regulator and the gas solenoid valve found in  
the back of the welder.  
* Secure gas hose with clamps to ensure there are no leaks.  
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5.3 Installation and Connection for Wire Feeder System (See Chart)  
* Select the proper wire for your welding application (see parameter chart). The wire diameter must match the  
drive roll groove, gun liner and contact tip.  
* Open drive system compartment and load spool of wire on wire spindle with wire coming off the bottom of the  
spool going towards the drive system. The adaptor is used for 8" spools. Remove adaptor and put 4" spools  
directly onto the spindle. Check the spool to see if it turns easily. Spool should freewheel without any binding  
on the shaft. If too tight, apply a small amount of light oil to the spindle to reduce friction.  
* Put the wing nut back on the spindle and tighten so there is a slight drag on the spool. If the screw is too tight, it  
will affect the feeding of the wire. It needs to be just tight enough to stop the spool from turning when the gun  
trigger is released.  
* Release the top drive roll and flip it up to expose the drive roll. Insert the wire into the wire guide tube on the  
drive system, feed the wire across the top of the drive roll into the liner on the gun side of the drive roll. Align  
the wire with proper drive roll groove. Tighten the set screw on the drive roll when it is properly aligned.  
5.4 Connection Between Drive System and Torch  
* Loosen the set screw on top of the connection block, insert the end of the torch into the torch access hole and  
push into the connection block until it is all the way in. Tighten the set screw on the connection block.  
5.5 Connection of the Gun Trigger Leads and Ground Cable  
* Feed the trigger leads through the hole for the ground cable and plug the trigger leads into the trigger receptacle.  
Polarity does not make a difference.  
* Connect the ground clamp cable with the lug on it through the wire access hole on the panel.  
* Polarity: For solid wires the electrode (gun) must be connected to the “+” polarity stud and the ground lead on  
the negative connection. For flux cored wires reverse the polarity and put the electrode (gun) on the negative  
stud and the ground cable on the “+” positive stud.  
6. Operation  
Notice: * Turn off power and close regulator valve when you finish welding or temporarily leave the jobsite.  
* Always wear:  
1) A full helmet to protect your eyes from UV and IR light. The helmet also protects your face and neck  
from sparks and flying debris.  
2) Long sleeve shirt  
3) Full length pants  
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4) Gloves  
5) Socks and shoes  
Protective clothing is available in flame-retardant materials.  
* Use welding screens to protect others from exposure to IR and UV rays  
6.1 Work Piece Cleaning before Welding  
Clean the weld groove and surrounding area of rust, grease, dirt and paint before welding. It is essential to have a  
clean weld area for the MIG process.  
6.2 Adjustment and Test before Welding  
* The cooling fan indicates that the switch is on.  
* The cylinder valve must be open before the gauges will indicate information.  
* To adjust gas flow, open the valve of gas regulator (rotate clockwise), disengage drive roll idle arm, press torch  
trigger and adjust gas flow to meet the welding requirements.  
* Make sure wire is in the correct drive roll groove, tighten idle arm on drive system, adjust wire feed speed to  
#10, remove contact tip, straighten torch, press torch trigger and feed the wire to torch head. WARNING: do not  
look into the end of the torch as wire coming out the end of the gun could damage your eyes or other facial  
features.  
* The wire feed speed should be consistent. If it is not, check the drive roll tension. Proper adjustment will result  
in even flow of wire.  
* When flux-core welding, over-tightening the drive roll arm can cause damage to the wire and affect smooth wire  
feeding.  
6.3 Welding  
* Check parameter chart for initial setting of the voltage and wire feed. Adjustment may be necessary for your  
application and style of welding.  
* Warning: Do not adjust the voltage setting while welding. MIG gun trigger must be released.  
6.4 Maintenance and Service  
* Proper maintenance and service are required to assure proper performance and prolong the life of your welder.  
Normal wear items include: MIG gun components (i.e., contact tips, nozzle, adaptor, liner, drive rolls, gas hose,  
and contactor).  
* If used in a dusty environment, the internal components will need to be cleaned with high-pressure air.  
Cleaning is recommended annually unless used in high dust environments.  
* Only qualified personnel are allowed to repair components that require the removal of the case. When in  
question, call the technical help number listed on the cover of this manual.  
* This welder is designed for use and storage indoors or in a covered area at 10°F–105°F. If used outside it  
should not be exposed to rain or high humidity.  
. * The ambient temperature range: when welding: -14°F–104°F  
during transport or in storage: -13°F–131°F  
* Relative humidity: when at 104°F: 50%,  
when at 68°F: 90%.  
* Not for use in high vibration conditions.  
* Do not use in the rain or other wet environments.  
* Make sure all cable connections are tight to assure proper connections.  
* Check shielding gas system for leaks around connections.  
* If there is abnormal noise from moving parts turn off, unplug and take to a qualified repair center.  
* Keep MIG gun cable as straight as possible when welding to reduce friction when wire is feeding through the  
gun.  
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* Regularly remove the spatter from the inside of the nozzle to prevent a short circuit. Use nozzle gel to  
minimize spatter buildup in the nozzle.  
* Use appropriate wire listed on the parameter chart. Do not use rusty or dirty wire.  
* Clean the dust and metal filings from the liner with compressed air. The dust is accumulated by friction  
between wire and liner, drive rolls and magnetic attraction of the wire to metal debris. If wire feeding is  
uneven this may be the problem.  
* Do not over tighten the drive roll idler are, it will increase resistance, friction and possible deform the wire.  
7. Troubleshooting  
7.1 Troubleshooting (See Table)  
No.  
Problem  
Possible Causes  
Input fuse/breaker blown or tripped  
Power not connected  
Solutions  
Change fuse, reset breaker  
Check and turn on power  
No wire feeding  
function when  
MIG gun trigger is  
depressed.  
1
Change trigger leads and MIG gun  
switch  
MIG gun trigger leads or switch not working  
Potentiometer not set high enough  
Wire stuck in contact tip  
Change potentiometer  
Change contact tip  
Wire feeding  
motor doesn’t  
work  
2
Tighten drive idle arm and check  
to see if the wire is in the proper  
drive roll gear.  
Drive idle arm too loose or wire is not  
in groove.  
Too large or worn contact tip results in unstable  
arc.  
Change contact tip to match the wire  
diameter  
Long light-duty gauge extension cord  
Use 12 gauge or heavier extension  
cord  
Arc is unstable and  
produces excess  
spatter  
3
Too low input voltage  
Check input power for sufficient  
voltage  
Wire feed resistance is too high  
Clean or replace the liner and use the  
MIG gun extended straight  
Ground clamp not connected or damaged  
Connect or replace ground lead  
No Arc  
4
Dirty work piece where ground clamp is  
attached, preventing a proper ground  
Remove rust, paint or other contaminants  
that prevent a good ground connection  
MIG gun O-ring or hose broken  
Replace O-ring or gas hose in gun  
Check gas system  
External gas hose pinched or not connected  
No shielded gas  
Others  
5
6
Solenoid or internal gas line not functioning or  
disconnected  
Replace or secure gas hose connections,  
replace solenoid.  
Call customer service  
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7.2 Common Weld Defects (See Table)  
No.  
Seam defect  
Possible Causes  
Wire and workpiece have excessive oil, rust or water.  
Gas holes  
1
Insufficient shielding gas coverage (low flow); silicon and manganese content are  
insufficient; nozzle is blocked up.  
Wire and work piece have excessive oil, rust and water.  
Current and voltage are not matched well.  
Crackle  
2
Melting depth is excessive; the carbon content of master material’s welding seam is too high.  
The first welding seam is too small when multi-layer welding; the welding sequence is wrong  
and the water content of gas is excessive.  
Arc length is too short and welding speed is too fast.  
Bite side  
3
4
Welding position is not correct; welding current is too low and the impression of pad is too  
deep.  
Welding current and voltage are not matched well.  
Wire and work piece are not clean.  
Excessive spatter  
Contact tip diameter is too little or large, stick out is too long.  
Welding current is too low; wire stick out is too long.  
Poor fit up; angle and gap are too small  
Melting depth is  
too shallow  
5
6
Others  
Contact customer service  
14  
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8. Circuit Chart  
MIG 175 Series Portable Wire Feed Welder Circuit Chart (see below)  
The circuit chart of MIG 175 Series. (Only for reference, no notification will be given if there are any changes.)  
15  
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9. Packing List  
Complete Set Specifications for MIG Series (See Table)  
*
*
*
*
*
*
*
*
*
*
MIG 175 Portable Wire Feed Welder  
1 unit  
Product Certificate  
Warranty Card  
1
1
1
1
Operator’s Manual  
Regulator  
Flux Core and solid wire samples  
MIG Gun  
1
1
1
1
Shielding gas hose  
Ground Cable and Clamp  
Extra Contact Tips  
10. Transport & Storage  
* The welder should not be exposed to rain and snow during transportation and storage. Store in a clean dry  
facility free from corrosive gas, excess dust and high humidity. Temperature range from 10°F–120°F and the  
relative humidity not be more than 90%.  
* 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.)  
11. Quality Guarantee  
Users are advised to operate in compliance with the guidelines in this manual. Proper care and use will ensure  
many years of welding performance. See warranty on back cover.  
16  
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12. Illustrated Parts List  
1
2
Wire Feed Door  
Wire Feeder  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
Diode  
Diode Assembly Board (2)  
Temperature Relay  
Diode  
3
MIG Gun Receptacle  
Front Panel  
4
5
On-off Switch  
Breaker  
6
Wire Feed Potentiometer  
Wire Feed Potentiometer Knob  
Voltage Switch Knob  
Insulating Flange  
MIG Gun  
Waterproof Cable Connector  
Gas Valve Connector  
Gas solenoid Valve DF2-3  
Back Panel  
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
Axle-shaped Fan  
Diode Assembly Board  
Reactor Assembly  
Transformer Assembly  
Spring on Wire Coil  
Plate on Wire Coil  
Wire Coil Locked Cover  
Support for Wire Coil  
Wire Coil Big Cover  
Wing Nut  
Ground Cable  
Voltage Switch  
Electric Capacitor  
Center Baffle  
Small Control Transformer  
Flat-Bottomed Isolated Inset  
Circuit Control Board  
Cover  
Handle  
17  
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Warranty  
Northern Tool + Equipment  
Effective Jan 1, 2007  
Limited Warranty  
This warranty applies to the original purchaser and is subject to the terms and conditions listed below.  
This Limited Warranty is for new equipment sold after the above date, providing coverage for defects  
in material and workmanship at the time it is shipped from the factory.  
Limited to the warranty periods listed below, Northern Tool + Equipment will repair or replace the item  
under warranty that fails due to defects in material and workmanship. Northern Tool + Equipment  
must be notified within 30 days of the failure, so as to provide instructions on how to proceed with the  
repair of your welder and warranty claim processing. Warranty period begins at the time the welder is  
purchased from Northern Tool + Equipment.  
Warranty Periods  
Limited Warranty is divided into four categories: No warranty, 6 months, 1 year, 3 year.  
No Warranty  
Normal wear items, MIG gun parts (contact tips, nozzle, adapter, MIG gun liner), drive roll, contactor,  
plasma torch parts (electrode, shield), TIG torch parts (tungsten, collet, back caps), electrode holder,  
are not covered under warranty.  
6 Months  
Parts and labor performed by authorized repair center with original equipment repair parts  
1Year  
Contactor, MIG gun parts (except those listed under normal wear items), Plasma torch (except those  
listed under normal wear items), TIG torch (except those listed under normal wear items), cables,  
remote amperage controls, regulator.  
3Year  
Includes: transformer, reactor, rectifier, solenoid valve, PC board, switches, controls, gas valve, drive  
motor, drive system.  
MIG175WelderManualCover.indd  
3
4/6/07 2:24:11 PM  
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Northern Tool + Equipment Co.  
2800 Southcross Drive West  
PO Box 1219  
Burnsville MN 55337  
MIG175WelderManualCover.indd  
4
4/6/07 2:24:11 PM  
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