VEVOR

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This document is the original instruction. Please read all manual instructions carefully before operating. VEVOR reserves the right to interpret its user manual. Product appearance is subject to the received item. VEVOR will not provide further notice for technology or software updates.

MACHINE OPERATING SAFETY

• Do not switch function modes while the machine is operating, as this can cause damage not covered by warranty.
• Disconnect the electrode-holder cable before switching on the machine to avoid arcing if the electrode contacts the workpiece.
• Operators should be trained and qualified.
• ⚡️ Electric shock: It can kill. Touching live electrical parts can cause fatal shocks or severe burns. The electrode and work circuit are live when the output is on. Input power circuits and internal machine circuits are also live when power is on. In MIG/MAG welding, the wire, drive rollers, wire feed housing, and metal parts touching the welding wire are electrically live. Incorrectly installed or improperly grounded equipment is dangerous.
• Connect the primary input cable according to America standards and regulations.
• Avoid contact with live electrical parts, electrodes, and wires with bare hands.
• The operator must wear dry welding gloves during welding/cutting tasks.
• Keep the work piece insulated from the operator.
• Keep cords dry, free of oil and grease, and protected from hot metal and sparks.
• Frequently inspect the input power cable for wear and tear. Replace damaged cables immediately; bare wiring is dangerous and can kill.
• Do not use damaged, undersized, or badly joined cables.
• Do not drape cables over your body.
• ? Fumes and gases are dangerous. Smoke and gas generated during welding or cutting can be harmful to health. Do not breathe smoke and gas; keep your head out of the fumes.
• Keep the working area well ventilated; use fume extraction or ventilation.
• In confined or heavy fume environments, wear an approved air-supplied respirator.
• Welding/cutting fumes and gases can displace air and lower oxygen levels, causing injury or death. Ensure breathing air is safe.
• Do not weld/cut near de-greasing, cleaning, or spraying operations, as heat and arc rays can react with vapors to form toxic gases.
• Avoid welding/cutting materials like galvanized, lead, or cadmium plated steel unless the area is well-ventilated or an air-supplied respirator is worn, as these materials can give off toxic fumes.
• ? Arc rays: harmful to people's eyes and skin. Arc rays produce visible and invisible ultraviolet and infrared rays that can burn eyes and skin. Always wear a welding helmet with the correct shade of filter lens and suitable protective clothing, including welding gloves.
• Take measures to protect people in or near the working area. Use protective screens or barriers to shield others from flash, glare, and sparks; warn others not to watch the arc.
• ? Fire hazard. Welding/cutting on closed containers (tanks, drums, pipes) can cause explosions. Flying sparks, hot work pieces, and hot equipment can cause fires and burns. Accidental contact of the electrode to metal objects can cause sparks, explosion, overheating, or fire. Ensure the area is safe before welding/cutting.
• Welding/cutting sparks and spatter may cause fire; remove flammable materials from the working area. Cover flammable materials and containers if they cannot be moved.
• Do not weld/cut on closed containers unless properly prepared according to safety standards to remove flammable or toxic vapors. Vent hollow castings or containers before heating, cutting, or welding.
• Do not weld/cut where the atmosphere may contain flammable dust, gas, or liquid vapors (e.g., petrol).
• Have a fire extinguisher nearby and know how to use it. Be aware that sparks and hot materials can travel through small cracks. Welding/cutting on ceilings, floors, bulkheads, or partitions can cause fires on hidden sides.
• ⛽️ Gas Cylinders. Shielding gas cylinders contain high-pressure gas. Damaged cylinders can explode. Treat gas cylinders carefully.
• Protect gas cylinders from excessive heat, mechanical shocks, physical damage, slag, open flames, sparks, and arcs.
• Ensure cylinders are held secure and upright.
• Never allow the welding/cutting electrode or earth clamp to touch the gas cylinder; do not drape welding cables over the cylinder.
• Never weld/cut on a pressurized gas cylinder; it can explode and cause death.
• Open the cylinder valve slowly and turn your face away from the outlet valve and gas regulator.
• ? Gas build up. Gas build-up can cause a toxic environment, depleting oxygen content, resulting in death or injury. Many welding/cutting gases are invisible and odorless.
• Shut off shielding gas supply when not in use.
• Always ventilate confined spaces or use an approved air-supplied respirator.
• ? Electronic magnetic fields. MAGNETIC FIELDS can affect Implanted Medical Devices. Wearers of Pacemakers and other Implanted Medical Devices should keep away. Implanted Medical Device wearers should consult their doctor and the device manufacturer before operating near any electric welding, cutting, or heating operation.
• ? Noise can damage hearing. Noise from some processes or equipment can damage hearing. Wear approved ear protection if noise level is high.
• ? Hot parts. Items being welded/cut generate and hold high heat and can cause severe burns. Do not touch hot parts with bare hands. Allow a cooling period before working on the welding/cutting gun. Use insulated welding gloves and clothing to handle hot parts and prevent burns.

CAUTION

1. Working Environment

• The environment must be free of grinding dust, corrosive chemicals, flammable gas or materials, and humidity should not exceed 80%.
• When using outdoors, protect the machine from direct sunlight, rain, and snow. The working environment temperature should be maintained between -10°C to +40°C.
• Keep the equipment 30cm distant from the wall.
• Ensure the working environment is well ventilated.

2. Safety Tips

i. Ventilation

The equipment is small-sized, compact, and offers excellent amperage output. The fan dissipates heat generated during operation. Maintain good ventilation of the louvres; the minimum distance between the equipment and any objects should be 30 cm. Good ventilation is critical for normal performance and service life.

ii. Thermal Overload protection

If the machine is used excessively, in high temperatures, a poorly ventilated area, or if the fan malfunctions, the Thermal Overload Switch will activate, and the machine will cease to operate. Leave the machine switched on to allow the built-in fan to cool it down. The machine will be ready for use again when the internal temperature reaches a safe level.

iii. Over-Voltage Supply

Regarding the power supply voltage range, refer to the "Main parameter" table. This equipment features automatic voltage compensation to maintain voltage within the given range.

In case the input power supply amperage exceeds the stipulated value, it may damage components. Ensure your primary power supply is correct.

Do not come into contact with the output terminals while the machine is in operation, as electric shock may occur.

LOCAL DESCRIPTION

The CT-312 CT-520 is a multifunctional welding and cutting machine developed using advanced inverter technology, offering three functions: argon arc welding, manual arc welding, and plasma cutting.

Inverter arc welding equipment utilizes inverter power theory and devices. The inverter arc welding/cutting power supply converts 50/60Hz power frequency into high frequency (50KHZ or above) using high-power IGBT tubes, then reduces voltage, rectifies it, and outputs a high-power DC source via pulse width modulation (PWM). This technology significantly reduces the weight and volume of the main transformer and increases efficiency by over 30%. Inverter welding machines are considered a revolution in the industry.

VEVOR's welding power supply provides stronger, more concentrated, and more stable arcs. When conducting short circuit droplet transfer, the reaction between the welding rod and the workpiece is faster after a short circuit, allowing for easier design of machines with different dynamic characteristics, adjustable to make the arc softer or harder.

For argon arc welding, the arc is easy to start, concentrated, and features early gas supply, delayed gas off, and a stable arc. As a manual arc welding machine, its external characteristics are oblique, with welding current and thrust current uniformly adjusted by the same potentiometer, ensuring good arc starting and constant power output for optimal weld formation and internal quality.

In plasma cutting, the arc undergoes forced compression by rapidly flowing air, reaching temperatures of 10000-15000 ℃ in an ionized state, forming a strong plasma arc. This process allows for rapid metal cutting with concentrated heat and energy, producing an extremely smooth cutting surface convenient for subsequent processing.

The CT-312 and CT-520 are widely used for welding and cutting carbon steel, stainless steel, alloy steel, copper, and other non-ferrous metals. They are compact, lightweight, efficient, energy-saving, stable, and reliable, with a conversion rate exceeding 85%. VEVOR welcomes user suggestions to perfect its products and services.

TECHNICAL PARAMETER TABLE

INSTALLATION INSTRUCTIONS

1. Tighten the copper gas nozzle with sealing tape around the IN and OUT ends.
2. Wrap sealing tape around the meter head and tighten it in the installation position.
3. Fix the connecting frame with nuts at the installation position of the pressure reducing valve behind the welding machine.
4. Unscrew the rubber nut and fix the pressure reducing valve on the connecting frame.
5. Turn on the air valve switch, lift the pressure regulating knob upwards, and adjust the air pressure. Rotate the knob towards "+" to increase pressure and towards "-" to decrease it, then press the knob to lower it.
6. The indicated position on the meter head scale (shown in the figure) is 4 kilograms of air pressure.
7. When there is too much water in the filter cylinder, open the water valve to drain it.

Connection and Operation

The welding machine is equipped with a power supply voltage compensation device, allowing operation within ±10% of the rated voltage.

When using longer cables, choose cables with a larger cross-section to reduce voltage drop, as excessively long cables can impact arcing performance. Use the recommended configuration length.

1. Confirm that the welding machine vent is not covered or blocked to prevent cooling system failure.
2. Connect the casing to a reliable grounding device using a conductor with a cross-sectional area of at least 6 square millimeters, or confirm the power socket's grounding terminal is reliably grounded. Both methods can be used simultaneously for safety.
3. Using manual arc welding (ARC) function:
   1. Ensure the cable is reliably connected to the welding pliers and quick plug. Insert the quick plug into the quick socket with polarity "-" on the welding machine and tighten clockwise.
   2. Insert the circuit cable's quick plug into the welding machine panel's quick socket with polarity "+argon arc/manual" and tighten clockwise. Clamp the ground wire at the other end to the workpiece.
   3. Pay attention to wiring polarity. DC welding machines typically use direct connection (welding handle to negative, workpiece to positive) or reverse connection (workpiece to negative, welding handle to positive).
4. Using argon welding (TIG) function:
   1. Connect the protective gas source properly, including gas cylinders, argon pressure reducing flow meters, and gas pipes. Secure pipe connections with clamps to prevent leakage.
   2. Install the gas-electric integrated connector of the welding gun onto the machine panel interface and tighten clockwise with a wrench. Insert the aviation plug on the welding gun into its corresponding interface and tighten screws.
   3. Insert the circuit cable's quick plug into the welding machine panel's quick socket with polarity "+argon arc/manual" and tighten clockwise. Clamp the ground wire at the other end to the workpiece.
5. Using the Cut function:
   1. Connect the gas inlet and compressed air source behind the cutting machine using a pressure-resistant gas pipe, securing the interface with a clamp. The air source must provide appropriate pressure, sufficient flow rate, and be dry. Consider a separate air compressor and gas pressure reducer if your current source is insufficient.
   2. Install the joint of the gas-electric integrated cutting gun onto the machine panel interface and tighten clockwise with a wrench. Connect the aviation plug on the cutting gun to its corresponding interface and tighten screws.
   3. Insert the circuit cable's quick plug into the quick socket with polarity "+cutting" on the machine panel and tighten clockwise. Clamp the ground wire at the other end to the workpiece.
   4. The current regulation range for CT 416GD is 20-40.
   5. Connect the power cord to the corresponding voltage level distribution box, ensuring the correct voltage is used and the power supply voltage error is within the allowable range.

After completing installation, the welding machine is ready for operation.

Related device specification sheet

DIGITAL PANEL OPERATION INSTRUCTION

The digital panel features the following controls and indicators:

• 1. Overheat protection indication
• 2. CURRENT display
• 3. Current Regulation knobs
• 4. Gas post flow time adjustment
• 5. TIG/CUT/MMA mode selection switch
• 6. On/Off power switch
• 7. Straight polarity terminal
• 8. Burden terminal
• 9. Gas electric integrated quick connector
• 10. Arc terminal
• 11. Aviation switch
• 12. Ground clamp

OPERATING INSTRUCTIONS

1. Use argon welding function:

1. Turn the power switch on the front panel to "ON". The power indicator light will illuminate, and the internal fan will start rotating.
2. Turn on the argon switch and adjust the gas flow rate to the rated standard.
3. Press the switch on the welding torch. The solenoid valve will activate, producing a high-frequency spark discharge sound inside the machine. Argon gas will flow from the welding torch nozzle. For first-time use, hold the switch for a few seconds until all air is discharged before welding. After stopping, argon gas will continue to flow for a few seconds to protect the welding point during cooling. Maintain the welding position for a period after the arc is extinguished before removing the welding gun.
4. Set the appropriate welding current based on workpiece thickness and process requirements.
5. Maintain a distance of 1-4mm between the tungsten electrode and the welding workpiece. Press the welding torch control switch; high-frequency discharge will occur between the electrode and workpiece. After ignition and arcing, the high-frequency sparks will disappear, and work can begin.

2. Use manual welding function:

1. Turn on the power switch; the power indicator light will illuminate, and the internal fan will start rotating.
2. Set the welding current and select appropriate welding rods based on workpiece thickness. Clamp the welding rods onto the welding tongs for welding.
3. Attention: When using manual arc welding, unplug the aviation plug.

3. Use cutting function:

1. Turn on the power switch; the power indicator light will illuminate, and the internal fan will start rotating.
2. Open the air valve or switch controlling air, and adjust pressure and air flow rate to the rated standard.
3. Press the switch on the cutting gun. The solenoid valve will activate, producing a high-frequency spark discharge sound inside the machine, and gas will flow from the cutting torch nozzle.
4. Set the cutting current based on the cutting thickness of the workpiece.
5. Contact the cutting gun nozzle with the cutting workpiece and press the button on the gun to create an arc. The high-frequency arc discharge sound will disappear, and cutting can begin. Maintain a distance of approximately 1mm between the nozzle and the workpiece during and after cutting to protect the nozzle.

TROUBLE SHOOTING

MAINTENANCE

Regularly remove dust with clean, compressed air. If the welding machine operates in smoky or heavily polluted conditions, remove accumulated dust daily. Compressed air pressure should be maintained at 2-4 bar to avoid damaging small internal parts.

Regularly check the internal systems of the welder and the correctness and reliability of connections (especially equipment and parts). If rust or loose connections are found, remove rust or oxide coating with sandpaper, then reconnect and tighten.

Avoid situations where water or steam can enter the device. If the welder gets wet, dry it thoroughly and check the insulation of the device (including between joints and contacts). Once everything is confirmed to be OK, normal operation can resume.