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Summary of Contents for Cornwell Tools MMWM142i
- Page 1 MMWM142i OWNER’S MANUAL 5/2019 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.
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Page 2: Limited Warranty
WELDER WARRANTY CORNWELL QUALITY TOOLS EFFECTIVE JANUARY 1, 2015 LIMITED WARRANTY This warranty applies to the original purchaser and is subject to the terms and conditions listed below. This Limited Warrant y 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. -
Page 3: General Safety Rules
GENERAL SAFETY RULES WARNING: Read and understand all instructions. Failure to follow all instructions listed below may result in serious injury. CAUTION: Do not allow persons to operate or assemble this welder until they have read this manual and have developed a thorough understanding of how the welder works. WARNING: The warnings, cautions, and instructions discussed in this instruction manual cannot cover all possible conditions or situations that could occur. - Page 4 -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.
- Page 5 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.
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Page 6: Technical Specifications
-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. Shielding Gas Cylinders Can Explode High pressure cylinders can explode if damaged, so treat them carefully. - Page 7 It features infinite wire feed speed control and voltage control giving you total control to tune in the arc you want. The MMWM142i also features a cooling fan, power, thermal overload protection (alarm), and work lights to help protect your investment. The Inverter Technology is evident from the moment you take this unit out of the box.
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Page 8: Installation
Power Indicator When the unit is plugged in and the power switch on the back panel is in the “On” position, the power indicator light will come on indicating power has been applied to the unit. Alarm Indicator If the duty cycle of the welder has exceeded the internal temperature or will exceed safe temperatures, the machine will shut down. - Page 9 2. EXTENSION CORD - We do not recommend an extension cord because of the voltage drop they produce. This drop in voltage can affect the performance of the welder. If you need to use an extension cord, it must be a size #12 or larger. Check with a qualified electrician and your local electrical codes for your specific area.
- Page 10 4. INSTALL THE WIRE 4.1 Select welding wire - We recommend the usage of .030 Wire on this unit. However, .023 - .035 wire may be used. Both four-inch and eight-inch wire spools can be used on this welder. NOTE: - Metal thinner than 24 gauge cannot be welded with this machine.
- Page 11 4.2.5 The welder can use either 4 or 8 inch spools. See the following figure for additional reference. The wing nut controls the tension on the spool. 8 Inch 4 Inch 4.2.6 Setting the wire spool tension. a) Turn the spool of wire with one hand. b) Increase the spool tension by tightening (turn clockwise) the wing nut while turning the spool.
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Page 12: Gas Installation
the voltage setting recommended for the gauge metal that is to be welded. Refer to the set-up chart on the back side of the drive compartment door. -The welding wire is electrically hot when the power is on and the torch trigger is activated. 4.2.16 Set the WIRE SPEED control to the middle of the wire speed range. - Page 13 6.1.2 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.
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Page 14: Operation
OPERATION High voltage danger from power source! Consult a qualified electrician for proper installation of receptacle at the power source. This welder must be grounded while in use to protect the operator from electrical shock. If you are not sure if your outlet is properly grounded, have it checked by a qualified electrician. -
Page 15: Welding Techniques
6. DISTANCE FROM THE WORK PIECE - If the nozzle is held off the work piece, the distance between the nozzle and the work piece should be kept constant and should not exceed 1/4 inch or the arc may begin sputtering, signaling a loss in welding performance. 7. - Page 16 ELECTRIC SHOCK CAN KILL! To prevent ELECTRIC SHOCK, do not perform any welding while standing, kneeling, or lying directly on the grounded workpiece. 8.1 Moving the torch Torch travel refers to the movement of the torch along the weld joint and is broken into two elements: Direction and Speed.
- Page 17 8.3 Welding position FLAT POSITION is 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. HORIZONTAL POSITION Is performed very much the same as the flat weld except that angle B (see HOLDING THE TORCH) is such that the wire, directed more toward the metal above the weld joint is to help prevent the weld puddle from running downward while still allowing slow enough travel speed.
- Page 18 OVERHEAD POSITION Is the most difficult welding position. Angle A (see HOLDING THE TORCH) should be maintained at 60 degrees. Maintaining this angle will reduce the chances of molten metal falling into the nozzle. Angle B should be held at zero degrees so that the wire is aiming directly into the weld joint.
- Page 19 8.5 Spot welding There are three methods of spot welding: Burn-Through, Punch and Fill, and Lap. Each has advantages and disadvantages depending on the specific application as well as personal preference. 8.5.1. The BURN-THROUGH METHOD welds two overlapped pieces of metal together by burning through the top piece and into the bottom piece.
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Page 20: Maintenance
MAINTENANCE • Maintain your welder. It is recommended that the general condition of any welder be examined before it is used. Keep your welder in good repair by adopting a program of conscientious repair and maintenance. Have necessary repairs made by qualified service personnel. •... -
Page 21: Diagram & Parts List
DIAGRAM & PARTS LIST Page of 23... - Page 22 REFERENCE PART NUMBER DESCRIPTION HANDLE 105200228 155200007 ENCLOSURE 155200006 NEED HELP LABEL 105200041 MIG WARNING LABEL 105800002 POWERCORD 105200045 GAS VALVE CONNECTOR 105200046 POWER SWITCH 105200230 REAR BEZEL 105200232 BACK PANEL 125200077 105200234 MAIN PCB SUPPORT 105200447 MAIN PCB 155200086 BASE PLATE 105500033 FEET...
- Page 23 Distributed by CORNWELL QUALITY TOOLS 667 SEVILLE RD WADSWORTH OH 44281 www.conwelltools.com Made in China Page of 23...
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