VEVOR MMA-140 Stick Welder User Manual

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Models

MMA-140

MMA-180

MMA-200

SAFETY

Welding is dangerous and may cause damage to grandmothers,stake good protection when welding. Please refer to the manufacturer’ safety guidelines for accident prevention

| Professional training is needed before operating the machine.

• Use labor protection welding supplies authorized by the national security supervision department.
• Operators should have valid work permits for metal welding/cutting operations.
• Cut off power before maintenance or repair.

---|---
| Electric shock may lead to serious injury or even death.

• Install earthing devices according to the user’s specification.
• Never touch the live parts with bare skin or while wearing wet gloves/clothes.
• Make sure that you are insulated from the ground and work piece.
• Make sure that your working position is safe.

| Smoke & gas may be harmful to health.

• Keep your head away from smoke and gas to avoid inhalation of exhaust gas during welding.
• Keep the working environment well ventilated with exhaust or ventilation equipment when welding.

| Arc radiation may damage eyes or burn skin.

• Wear suitable welding masks and protective clothing to protect your eyes and body.
• Use suitable masks or screens to protect spectators from harm.

| Improper operation may cause fire or explosion.

• Welding sparks may result in a fire, so please check that no combustible materials are nearby and pay attention to fire hazards.
• A fire extinguisher should be kept nearby, and it should be used by a trained person.
• Do not weld in a confined space.
• Do not use this machine for pipe thawing.

| Hot work piece may cause severe scalding.

• Do not touch hot work piece with bare hands.
• Cooling is needed during continuous use of the welding torch.

| Magnetic fields affect cardiac pacemaker.

• Pacemaker users should stay be away from the welding area before medical consultation.

| **Please seek professional help when encountering machine failure.**

• Refer to the relevant contents of this manual if you encounter any difficulties in installation and operation.
• Contact the service center of your supplier to seek professional help if you do not fully understand the manual or solve a problem according to the manual.

BRIEF INTRODUCTION OF THE PRINCIPLE

The welding machine uses an advanced inverter technology designed rectifier. The emergence of inverter arc welding equipment is due to the emergence of inverter power theory and devices. Inverter arc welding power supply is the use of a high-power device MOSFET field effect tube/IGBT single tube/module 50/60Hz power frequency electricity is converted to high frequency (18-100KHZ above), and then step-down rectifier, through the pulse width modulation technology (PWM) output high-power DC source, the weight of the main transformer, the volume is greatly reduced, the efficiency is increased by more than 30%. The advent of the inverter welding machine is praised by experts as a revolution in the welding industry.
Hand arc welding machine can provide a stronger, more concentrated, more stable arc in the short circuit droplet transition. The electrode and the workpiece react rapidly after the short circuit. In addition, this type of power supply can be equipped with an arc adjustment device, which means that the welding machine can be designed with different dynamic characteristics. The dynamic characteristics can be adjusted to make the arc softer or harder.
Hand arc welding machine series are characterized by: high efficiency, energy saving, light, good dynamic characteristics, arc stability, and easy control of solution pools. High no-load voltage and better energy thrust compensation are widely used. Can weld stainless steel, alloy steel, carbon steel, copper, and other non-ferrous metals. The welding machine can use a variety of different specifications and materials of an electrode, including acid, alkaline, and cellulose electrode can be used for aerial work, fieldwork, and indoor and outdoor decoration. Compared with similar products at home and abroad, it has the characteristics of small size, lightweight, simple installation, easy operation, and so on.

INSTALLATION

Main paramter

110V:30-120A220V:30-200A
Duty Cycle (%)| 15%/40℃| 30%/40℃| 30%/40℃
Hot Start| YES| YES| YES
Arc Force| YES| YES| YES
VRD| YES| YES| YES
lift-TIG| NO| YES| YES
Hot Stapler| YES| YES| YES
 Accessory| Adapter1 ,Stick Electrode Holder1,Ground clamp1, Welding Rod 1, Hot Staple Gun*1, *Heating Repair Pin100PCS**

Functional Diagram

SITE SELECTION

BE SURE TO OPERATE THE WELDER ACCORDING TO THE FOLLOWING GUIDELINES:

• In areas free from moisture and dust;
• In areas with an ambient temperature between 14℉to104℉;
• In areas free from oil, steam, and corrosive gases. ● In areas not subjected to abnormal vibration or shock;
• In areas not exposed to direct sunlight or rain;
• Place at a distance of 12″ or more from walls or similar obstructionsthat could restrict natural airflow for cooling.

Power Source Connection
Make sure that the ON/OFF SWITCH is OFF before you make any electrical connection. The power supply voltage and frequency available at the site are those stated in the rating label of your welder. The main power supply voltage should be within ±10% of the rated main power supply voltage. Too low a power supply voltage may cause poor welding performance. Too high a power supply voltage will cause components to overheat and possibly fail. The welder outlet must be:

• Correctly installed, if necessary, by a qualified electrician.
• Correctly grounded (electrically) under national and local regulations.
• Connected to an electric circuit that is rated for sufficient amperage per the rating label of your welder.

If you are unsure of any of the above, have your outlet inspected by a qualified electrician before using the welder.

NOTE:

• Periodically inspect the INPUT POWER CABLE for any cracks or exposed wires. If it is not in good condition, have it repaired by a Service Center.
• Do not cut off the grounding prong or alter the plug in any way, and do not use any adapters between the welder’s INPUT POWER CABLE and the power source receptacle.
• Do not violently pull the INPUT POWER CABLE to disconnect it from the power outlet.
• Do not lay material or tools on the INPUT POWER CABLE. The INPUT POWER CABLE may be damaged and result in electrical shock.
• Keep the INPUT POWER CABLE away from heat sources, oils, solvents, or sharp edges.
• Do not use this welder on a circuit with a Ground Fault Circuit Interrupter(GFCI) on it. GFCls are tripped by welding arcs and your weldingoperations will be interrupted regularly.

Generators
This welder can be operated from an AC generator. Ensure that the generator can supply a minimum of 5,000 watts of continuous output. The generator must not have an auto-idle fuel-saving feature, and must have the option to turn the auto-idle off. The generator must run at full speed at all times while your welder is plugged into it, or you risk damaging your welder. Any other power draws on the generator or anything that reduces the generator RPM may damage your welder.

Extension Cords
For optimum welder performance, an extension cord should not be used unless absolutely necessary. If necessary, care must be taken in selecting an extension cord appropriate for use with your specific welder. Select a properly grounded extension cord that will connect directly with the AC power source receptacle and the welder INPUT POWER CABLE without the use of adapters. Make certain that the extension cord is properly wired and in good electrical condition. Extension cords must fit the following wire size guidelines:

• 12 AWG or larger wire

• Do not use an extension cord over 25 ft. in length.

Ventilation
Since the inhalation of welding fumes can be harmful, ensure that the welding area is effectively ventilated.

Additional Warnings
FOR YOUR SAFETY,BEFORE CONNECTING THE POWER SOURCE TO THE LINE CLOSELY FOLLOW THESE INSTRUCTIONS:

• An adequate two-pole breaker must be inserted before the main outlet. This breaker must be equipped with time-delay fuses.
• When working in a confined space, the welder must be kept outside the welding area and the ground cable should be fixed to the workpiece. Never work in a damp or wet confined space.
• Do not use damaged INPUT POWER CABLE or welding cables.
• The welding torch/electrode should never be pointed at the operator or other people.
• The welder must never be operated without its panels attached. This could cause serious injury to the operator and could damage the equipment.

OPERATION

Performance Data Plate and Duty Cycle
On the machine, there is a plate that includes all the operating specifications for your new unit. The serial number of the product is also found on this plate. The duty cycle rating of a welder defines how long the operator can weld and how long the welder must rest and be cooled. The duty cycle is expressed as a percentage of 10 minutes and represents a maximum welding time limit. The balance of a 10-minute cycle is required for cooling. For example, a welder has a duty cycle rating of 30% at the rated output of 90A. This means with that machine can weld at 90 A output for three (3) minutes cut of 10 with the remaining seven (7) minutes required for cooling. The duty cycle of your new welder can be found on the data plate affixed to the machine.

Internal Thermal Protection
The thermal protection system will engage, shutting off all welder output if you exceed the duty cycle of the welder. After cooling, the thermal protector will automatically reset, and the welding functions will resume. This is normal and automatic behavior from the machine. No user action is required during this phase. However, you should wait at least ten minutes after the thermal protector engages before resuming welding. You must do this even if the thermal protector resets itself before the ten minutes is up, or you may experience less than specified duty cycle performance.

CAUTION:DO NOT REGULARLY EXCEED THE DUTY CYCLE OR DAMAGE TO THE WELDER CAN RESULT

Welding Preparation
An important factor in making a satisfactory weld is preparation. This includes studying the process and equipment and practicing welding before attempting to weld finished product. An organized, safe, ergonomic, comfortable, and well-lit work area should be prepared for the operator. The work area should especially be free of all flammables, and a fire extinguisher and a bucket of sand should be available. To properly prepare for welding with your new welder, it is necessary to:

• Read the safety precautions at the front of this manual.
• Prepare an organized, well-lit work area. Provide protection for the eyes and skin of the operator and bystanders.
• Attach the ground clamp to the bare metal to be welded, ensuring good contact. Plug the machine into a suitable outlet.
• Completely open the gas cylinder valve. Adjust the gas pressure regulator to the correct flow rate.

MMA function:Select MMA by up and down button.

1. Under MMA: The Current/Hot Start / Arc Force can be selected. After selecting, adjust the knob directly to adjust each function parameter; after adjusting, press the knob once to save and enter the next function parameter adjustment. After adjustment, 5S automatically save and exit to Current.
   

2. Current: @110V, 30-120A adjustable; @220V, 30-140A adjustable Hot start: Superimposed current value (not exceeding the maximum current), 0-100A Arc Force: superimposed current value (not exceeding the maximum current), 0-100A

3. Under MMA, press and hold the knob for 5S to switch Vrd.

4. Anti-stick: automatic, no need to operate 5. Acid welding rod: positive electrode connection welding pliers / negative grounding wire clamps Alkaline welding rod : Negative welding pliers / positive grounding clamps

Electric arc welding

1. Welding rod grade and diameter. It mainly depends on the nature of the material, the thickness of the weld, the form of the joint weld position, weld parameters, and other factors. The relationship between the diameter of the welding electrode and the thickness of the plate is asfollows.
   Thickness of Welded Parts（㎜）| ＜4| 4 ～ 8| ＞ 8 ～ 12| ＞ 12
   ---|---|---|---|---
   Diameter of Welding Electrode（ф㎜）| ≤ 3.5| ф3 ～ 4| ф4 ～ 5| ф5 ～ 6
2. . Welding Current: The welding current depends on the electrode, electrode diameter, thickness of the welded parts, and joint type weld position. Other factors to consider are the structural steel welding electrode flat welding positions, and the welding current based on the following empirical formula to primary selection.
   K =Id |–Welding Current ~K–Empirical Coefficient d–Diameter of Welding Electrode
   Relationship between the empirical coefficient of welding current and the diameter of the welding electrode. Diameter of Welding Electrode （㎜）| ф1.6| ф2 ～ 2.5| ф3 ～ 4| ф4 ～ 6
   ---|---|---|---|---
   Empirical Coefficient（A/mm）| 20 ～ 25| 25 ～ 30| 30 ～ 40| 40 ～ 50

The current of vertical welding, horizontal welding, and over-head welding should be 10 ~ 20% less than that of flat welding. The current of fillet welding should be 10 ~ 20% larger than that of flat welding. For alloy steel electrodes, stainless steel electrodes, due to the high thermal expansion coefficient of resistance, if the current is high, the welding rod is prone to reddening during the welding process and cause the flux skin to fall off, affecting the quality of welding.

3. Connection method of welding output The DC reverse connection method should be used for alkaline electrode welding. Acid electrode welding should use a DC positive connection method.

Hot Stapler

1. Select “Hot stapler” via the up and down button. In “Hot Stapler” mode, the Vrd light will be on automatically, and all other functions are not adjustable except “Current”.
2. Adjust the gear of the plastic welding through the knob, and select the corresponding 1 or 2 gears according to the thickness of the welding material.
3. Press the switch button on the grip and hold for about 3 seconds until the pin is hot enough to weld. Then press the pin gently against the desired repair location.

WHEN THE HEATING REPAIR PIN IS PRESSED TOO HARD, IT MAY PENETRATE THE OBJECT. PLEASE PRESS LIGHTLY.

4. When the pin is taken halfway to the repairing part, release the switch button on the grip, then wait for a few seconds until the repair part becomes firm. After that, draw the pin out of the grip.
5. When a repairing part reaches long and wide, please repeat the procedure 5 ~ 7 at intervals of 1 ~ 3cm.
6. Cut off the pin using pliers.
7. Grind off the excess of the pins using a sander. Apply putty and paint if you wish to finish the surface more finely.
   

WARNING! Once a pin is set to a switch grip and switch is turned on, the temperature of a pin will become 100°C – 200°C. If poor handling occurs, it may cause burns, blindness, and a fire.

• Before setting the pin, make sure that the tip of the switch grip is cold.
• Do not touch the heating repair pin with bare hands when it is set in the switch grip.
• Do not use near combustible materials.
• Since it reaches a high temperature, let people around you know it is dangerous.
• Do not use with wet hands.
• Do not soak this product in water.
• Do not use in wet locations.
• When you are finished working and leave the worksite, turn off the switch and make sure that the tip of the switch grip is fully cool.
• Repairing objects reach high temperatures. Please be aware of burning by melted plastic.

MAINTENANCE & SERVICING

General Maintenance
This welder has been engineered to need minimal service, providing that a few simple steps are taken for proper maintenance.

1. Replace the INPUT POWER CABLE , ground cable, ground clamp, or torch/electrode cable when damaged or worn.

2. Avoid directing grinding particles toward the welder. These conductive particles can build up inside the machine and cause severe damage.

3. Periodically clean dust, dirt, and grease from your welder. Every six months or as necessary, remove the side panels from the welder and use compressed air to blow out any dust and dirt that may have accumulated inside the welder.
   WARNING:DISCONNECT FROM POWER SOURCE WHEN CARRYING OUT THIS OPERATION.

4. Check all cables periodically.They must be in good condition and not cracked.

WARNING:ELECTRIC SHOCK CAN KILL! Be aware of the ON/OFF SWITCH. The OFF switch does not remove power from all internal circuitry in the welder. To reduce the risk of electric shock, always unplug the welder from its AC power source and wait several minutes for electrical energy to discharge before removing the side panels.

TROUBLESHOOTING

The following is a troubleshooting table provided to help you determine a possible remedy when you are having a problem with your welder. This table does not provide all possible solutions, only those possibilities considered likely to be common faults.

Ground clamp,ground cable,and/or welding cable get hot.     Bad ground or loose ground connection.   Frequent circuit breaker trips.Machine is not the only piece of electrical equipment on the circuit.      Poor quality welds. Insufficient gas at weld area.Difficult        arc start.Amperage is too low.Arc is wandering(TIG).Tungsten is too large.

No input power present.

| Make sure machine is plugged in.Verify that circuit breaker has not been tripped.Reset if needed.Verify output power from the outlet.Do not use the machine on a GFI outlet.
INDICATORLEDS are illuminated and there is no output power from the welder.|

Exceeded duty cycle;thermal protectorengaged.

| Allow welder to cool at least 10 minutes with machine ON (observe and maintain proper duty cycle).FAULT/THERMAL OVERLOAD INDICATORLED should turn off after the machine has cooled
Insufficient air flow causing machine tooverheat before reaching duty cycle.| Check for obstructions blocking air flow and ensure that there are 12 inches of clearance between any obstacles and the vents on allsides of the machine.
Incorrect voltage supplied to welder.| Check the voltage of your outlet. If it is 10% more or less than 120V, call a qualifiedelectrician.
Low output or non-penetrating weld.| Too long or improper extension cord.| Use a proper extension cord(#12 AWG wire or heavier,no longer than 25 ft.)
Poor ground connection or torch/electrode connection.| Reposition clamp and check cable to clamp connection. Check connection of ground cable,torch or electrodeholder

Input power too low.

| Have a qualified electrician verify the voltage at your outlet. If the voltage is appropriate, verify that the circuit wiring is sufficient for40A.
Check connection of ground cable,torch or electrode holder.Check connection of the ground cable to the ground clamp.Tighten cable connection to ground clamp if needed.Ensure the connection between the ground clamp and workpiece is good and on clean,bare(not painted orrusted) metal.
Make sure the welder is on a dedicated circuit or is the only thing plugged on a circuit.
Circuit breaker is incorrect/insufficient for use with this machine.| Verify that the circuit breaker for the circuit is a slow-blow breaker.If it is not,have a qualified electrician install the proper breakers.
Check that the gas is not being blown away by drafts and, if so, move to a more sheltered weld area. If not,check gascylinder contents,gauge,regulator setting,and operation of gas valve.
Rusty,painted,oily or greasyworkpiece.| Ensure workpiece is cleanand dry.
Poor ground connection or torch/electrode connection.| Check ground clamp/workpiece connection and allconnections to the machine.
Increase amperage setting.
Use a smaller tungsten.

Manufacturer: Foshan Sangiao Welding industrial Co., Ltd
Address No.60, Dongyu Industrial District, Lianan Avenue, Foshan city, Guangdong province, China

Made In China

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References

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