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MIG 140i 120V Inverter MIG Welder

Owner’s Manual

WARNING:

Read carefully and understand all ASSEMBLY AND OPERATION

INSTRUCTIONS before operating. Failure to follow the safety rules and other basic safety
precautions may result in serious personal injury.

Item #74220

Summary of Contents for MIG 140i

Page 1: ...verter MIG Welder Owner s Manual WARNING Read carefully and understand all ASSEMBLY AND OPERATION INSTRUCTIONS before operating Failure to follow the safety rules and other basic safety precautions may result in serious personal injury Item 74220 ...

Page 2: ...tant that you read the entire manual to become familiar with this product before you begin using it This welder is designed for certain applications only Northern Tool Equipment is not responsible for issues arising from modification or improper use of this product such as an application for which it was not designed We strongly recommend that this product not be modified and or used for any appli...

Page 3: ...ations 4 Important Safety Information 5 Specific Operation Warnings 6 Main Parts of MIG140i 11 Setting Up Equipment 12 Before Each Use 18 Operating Instructions 19 After Each Use 25 Maintenance 25 Troubleshooting 26 Parts Diagram 28 Parts List 28 Replacement Parts 29 Limited Warranty 30 ...

Page 4: ...s where the influence of wind can be controlled to prevent the shielding gas from blowing away MIG welding allows you to weld thinner materials without burn through It also creates a much cleaner weld with less spatter and no slag The result is little post weld cleaning of the weld joint This unit is intended to be used on a 20 amp 120V AC circuit without the use of an extension cord If an extensi...

Page 5: ...be a safer experience and do the job better at the capacity for which it was intended DO NOT use this equipment for a purpose for which it was not intended Industrial or commercial applications must follow OSHA requirements WARNING WORK AREA SAFETY Inspect the work area before each use Keep work area clean dry free of clutter and well lit Cluttered wet or dark work areas can result in injury Using...

Page 6: ...CAUTION WELDER USE AND CARE Do not force the welder Products are safer and do a better job when used in the manner for which they are designed Plan your work and use the correct product for the job Check for damaged parts before each use Carefully check that the product will operate properly and perform its intended function Replace damaged or worn parts immediately Never operate the product with ...

Page 7: ...TION During Operation Do not operate the welder if the output cable electrode torch or any accessories are wet Do not immerse them in water These components and the welder must be completely dry before attempting to use them Follow the instructions in this manual Keep the 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 g...

Page 8: ...mp to the work piece or 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 WARNING Fumes and Gases Do not use the plasma cutter in the presence of gasoline diesel propane or other flammable liquids Sparks created from the cutter may ignite liquids or fumes causing an explosio...

Page 9: ...reens 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 WARNING 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 explosive materi...

Page 10: ...h radio navigation safety services computers and communications equipment Have only qualified persons familiar with electronic equipment perform this installation The user is responsible for having a qualified electrician promptly correct any interference problem resulting from the installation If notified by the FCC about interference stop using the equipment at once Have the installation regular...

Page 11: ...de if damaged treat them carefully Never expose cylinders to high heat sparks open flames mechanical shocks or arcs Do not touch the cylinder with the 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 t...

Page 12: ...k to make certain the correct wire groove is in place to accommodate the size of wire you are using Open the wire feed compartment Adjust the drive roller according to the following steps see the following images regarding the wire feeder structure figure 2 a Open the door to the welder drive compartment b Remove the drive tension by loosening the drive tension adjusting knob 1 and lifting the Dri...

Page 13: ... source before installing wire NOTE Before installing make sure that you have removed any old wire from the torch assembly This will help to prevent the possibility of the wire jamming inside the gun liner NOTE Be very careful when removing the welding nozzle The contact tip on this welder is live whenever the torch trigger is pulled Make certain power is turned OFF i Remove the nozzle and contact...

Page 14: ... The welding wire should always come off the bottom of the spool into the drive mechanism Figure 4 Figure 4 v The welder can use either 4 inches or 8 inch spools See Figure 5 for additional reference The wing nut controls the tension on the spool Figure 5 4 Inch 8 Inch MIG Nozzle Flux Core Nozzle Contact Tip ...

Page 15: ... roller xi Insert the wire into the inlet guide tube and feed it across the drive roller and into the torch assembly about six inches CAUTION Make certain that the welding wire is actually feeding into the torch liner If not the wire will jam up in the mechanism xii Line the wire up with the correct groove in the drive roller Place the drive tension arm back above the drive roller xiii Place the d...

Page 16: ...s To reduce the risk of arc flash make certain that the wire coming out of the end of the torch does not come into contact with the work piece ground clamp or any grounded material during the drive tension setting process or arcing will occur a Press the trigger on the torch b Turn the drive tension adjustment knob clockwise until the wire seems to feed smoothly without slipping 6 GAS INSTALLATION...

Page 17: ...lator 5 Gas Flow Adjuster 6 Gas Hose Connection 7 Gas Cylinder d Open the Gas Bottle Valve on the cylinder of gas e Turn the Gas Flow Adjuster on the regulator so that the gas flow rate is set at approximately 20 CFH Make certain you are reading the correct scale on the gauge NOTE Slowly open the cylinder valve by turning it counter clockwise until the cylinder pressure gauge registers on the firs...

Page 18: ...eld output connection c Electrode Negative for Flux Core Welding The Weld Power Cable should be connected to the negative weld output connection on the front of the machine The ground cable would then be connected to the positive weld output connection Refer to the polarity setting label inside the wire compartment Before Each Use WARNING ELECTRIC SHOCK CAN KILL Touching live electrical parts can ...

Page 19: ...unplug the welder before performing any maintenance 2 HOLDING THE TORCH The best way to hold the welding torch is the way it feels most comfortable to you While practicing using your new welder you can experiment holding the torch in different positions until you find the one that seems to work best for you 3 POSITION OF THE TORCH TO THE WORK PIECE There are two angles of the torch nozzle in relat...

Page 20: ... increasing the wire speed adjustment until you achieve a smooth buzzing sound If the wire seems to pound into the work piece decrease wire speed slightly and try again Use the wire speed control to slightly increase or decrease the heat and penetration for a given voltage setting by increasing or decreasing the wire speed slightly Repeat this tune in procedure if you select a new voltage setting ...

Page 21: ... the slower the travel speed the deeper the penetration will be and the higher and wider the finished weld bead will be b Types of Welding Beads As you become more familiar with your new welder and better at laying some simple weld beads you can begin to try some different weld bead types The STRINGER BEAD is formed by traveling with the torch in a straight line while keeping the wire and nozzle c...

Page 22: ...ny people to pull the torch from top to bottom It can be difficult to prevent the puddle from running downward Pushing the torch from bottom to top may provide better puddle control and allow slower rates of travel speed to achieve deeper penetration When vertical welding angle B see HOLDING THE TORCH is usually always kept at zero but angle A will generally range from 45 to 60 degrees to provide ...

Page 23: ...one bead into the same weld joint is known as a multiple pass weld The illustrations in the following figure show the sequence for laying multiple pass beads into a single V butt joint NOTE WHEN USING SELF SHIELDING FLUX CORE WIRE it is very important to thoroughly chip and brush the slag off each completed weld bead before making another pass or the next pass will be of poor quality Fillet Weld J...

Page 24: ...n is acceptable Always select the HIGH heat setting with the burn through method and tune in the wire speed prior to making a spot weld ii The PUNCH AND FILL METHOD produces a weld with the most finished appearance of the three spot weld methods In this method a hole is punched or drilled into the top piece of metal and the arc is directed through the hole to penetrate the bottom piece The puddle ...

Page 25: ...th bare hands Do not touch the torch nozzle after welding until it has had time to cool down 1 Turn Off the power switch when not using the equipment 2 Turn Off any shielding gases you may have used during the operation of this equipment 3 Inspect all cords and power cables Replace any cords or power cables that are damaged or cracked 4 Disconnect and organize welding cables so they are protected ...

Page 26: ...al operation schedule Maintenance Interval Maintenance Point Before Each Use Inspect all cords and power cables Replace any cords or power cables that are damaged or cracked Every 3 Months Inspect all warning and caution labels affixed to this unit If they are worn torn or otherwise unreadable then replace the warning labels Inspect and clean and tighten all weld power connections Troubleshooting ...

Page 27: ...y install the drive roller Wire feeds inconsistently Torch liner is plugged Clear or replace torch liner Wire diameter may vary on spool of wire causing the wire to catch in the contact tip Increase the contact tip one size Too much or too little wire tension See Installing the Wire section Too much or too little drive roll tension See Setting Drive Roll Tension section Drive roll is worn Replace ...

Page 28: ...etting is incorrect Refer to the label inside the wire compartment door for wire speed setting recommendations Voltage setting is incorrect Refer to the label inside the wire compartment door for voltage setting recommendations For assistance contact the Welder Help Line at 877 304 0294 Parts Diagram Parts List Reference Part Number Part Description Quantity 1 105200445 HANDLE 1 2 105100075 HINGE ...

Page 29: ...PRING 1 19 4 105200013 BOLT 1 19 5 105200014 HOLDER END FIXED 1 20 105500033 FEET 4 21 105200451 BOTTOM 1 22 125200077 FAN 1 23 105300154 STRAIN RELEIF 1 24 105800002 INPUT POWER CABLE 1 25 105200266 GAS CONNECTOR 1 26 105400050 POWER SWITCH 1 27 105200080 DOOR LATCH 1 28 125200073 DOOR 1 125200075 OPERATORS MANUAL MIG 140i 1 105200081 GAS HOSE TO REGULATOR 1 105200082 INERT GAS REGULATOR 1 Item n...

Page 30: ...y claim contact Us at 1 800 222 5381 identify the product by make and model number and follow the claim instructions that will be provided The product and the purchase receipt must be provided to Us in order to process Your warranty claim Any returned product that is replaced or refunded by Us becomes our property You will be responsible for return shipping costs or costs related to Your return vi...

Page 31: ...Page 31 of 31 Distributed by Northern Tool Equipment Company Inc Burnsville Minnesota 55306 www northerntool com Made in China ...

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