JASIC NB-250 (N214II) MIG Gas Protected Welder Instruction Manual

1. Introduction

The JASIC NB-250 (N214II) is a versatile multi-process welding machine designed for MIG (Gas Metal Arc Welding), TIG (Gas Tungsten Arc Welding), and MMA (Manual Metal Arc Welding) applications. This gas-protected welder offers robust performance and reliability for various welding tasks. This manual provides essential information for the safe and effective operation, setup, and maintenance of your welding machine.

2. Safety Information

Always prioritize safety when operating welding equipment. Failure to follow safety precautions can result in serious injury or death.

• Eye and Face Protection: Always wear a welding helmet with appropriate shade lenses to protect against arc flash and sparks.
• Respiratory Protection: Ensure adequate ventilation or use a respirator to avoid inhaling welding fumes.
• Fire Hazards: Keep flammable materials away from the welding area. Have a fire extinguisher readily available.
• Electrical Safety: Ensure the machine is properly grounded. Do not operate in wet conditions. Inspect cables for damage before use.
• Protective Clothing: Wear flame-resistant clothing, gloves, and closed-toe shoes to protect against burns and electrical shock.
• Work Area: Keep the work area clean and free of clutter. Ensure stable footing.

3. Setup

Follow these steps to set up your JASIC NB-250 welder:

1. Unpacking and Inspection: Carefully unpack the welder and all accessories. Inspect for any shipping damage. Ensure all components listed in the packing list are present.
2. Power Connection: Connect the welder to a single-phase AC220V ± 15% power supply. Ensure the power outlet is properly grounded and can handle the rated input capacity of 7.7 kVA.
3. Ground Clamp Connection: Securely attach the ground clamp to a clean, bare metal section of your workpiece or welding table. A good ground connection is crucial for stable arc and safe operation.
4. Welding Torch/Electrode Holder Connection:
   • For MIG Welding: Connect the MIG torch to the appropriate connector on the front panel.
   • For TIG Welding: Connect the TIG torch to its designated port.
   • For MMA Welding: Connect the electrode holder to the positive (+) terminal and the ground clamp to the negative (-) terminal for most electrodes, or vice-versa depending on electrode type.
5. Gas Connection (for MIG/TIG): If performing MIG or TIG welding, connect your shielding gas cylinder (e.g., Argon, CO2, or a mix) to a gas regulator. Attach the gas hose from the regulator to the gas inlet on the rear of the welding machine. Ensure all connections are tight to prevent leaks.
6. Wire Feed Setup (for MIG): Open the side panel to access the wire feeder mechanism. Load the appropriate welding wire spool, thread the wire through the drive rollers, and into the MIG torch liner. Adjust the wire tension according to the wire diameter and material.

4. Operating Instructions

The JASIC NB-250 features a user-friendly control panel for selecting welding modes and adjusting parameters.

4.1. Control Panel Overview

The front panel (Figure 4.1) typically includes:

• Mode Selector: To switch between MIG, TIG, and MMA welding processes.
• Digital Displays: For showing welding current (A) and voltage (V).
• Adjustment Knobs: For fine-tuning welding current, voltage, and wire feed speed (for MIG).

4.2. MIG Welding (Gas Metal Arc Welding)

MIG welding is ideal for fast and efficient welding of various metals.

1. Select 'MIG' mode on the control panel.
2. Set the desired welding current between 50A and 200A.
3. Adjust the welding voltage between 13V and 26V.
4. Set the wire feed speed within the range of 2 m/min to 24 m/min.
5. Ensure the shielding gas flow is active and set to the appropriate rate for your material and wire.
6. Begin welding, maintaining a consistent travel speed and arc length.

4.3. TIG Welding (Gas Tungsten Arc Welding)

TIG welding provides high-quality, precise welds, especially for thinner materials.

1. Select 'TIG' mode on the control panel.
2. Set the desired welding current between 50A and 200A.
3. The arc initiation mode for this machine is Contact Arc Initiation. Gently touch the tungsten electrode to the workpiece to initiate the arc, then lift slightly to establish the arc.
4. Ensure the shielding gas (typically Argon) flow is active.
5. Feed filler rod manually into the weld puddle as needed.

4.4. MMA Welding (Manual Metal Arc Welding)

MMA welding, also known as Stick welding, is versatile for outdoor use and thicker materials.

1. Select 'MMA' mode on the control panel.
2. Set the desired welding current between 50A and 160A, based on the electrode type and diameter.
3. Strike the electrode against the workpiece to initiate the arc, then maintain a consistent arc length and travel speed.

5. Maintenance

Regular maintenance ensures the longevity and optimal performance of your welding machine.

• Cleaning: Periodically clean the internal components of the welder using compressed air to remove dust and metal particles. Ensure the machine is unplugged before cleaning.
• Cable Inspection: Regularly inspect all welding cables, ground clamps, and torch connections for wear, cuts, or damage. Replace damaged components immediately.
• Consumables: For MIG, regularly check and replace worn contact tips, nozzles, and liners. For TIG, inspect and sharpen tungsten electrodes and replace gas lenses/collets as needed. For MMA, ensure electrodes are stored in dry conditions.
• Wire Feeder (MIG): Clean the drive rollers and ensure they are free of debris. Check and adjust wire tension as necessary.
• Storage: Store the welder in a clean, dry environment, protected from dust and moisture, when not in use.

6. Troubleshooting

Here are some common issues and their potential solutions:

• No Arc:
  • Check power supply and ensure the machine is turned on.
  • Verify ground clamp connection is secure and on bare metal.
  • Inspect welding cables and torch for damage.
  • Ensure correct welding mode is selected.
• Poor Weld Quality:
  • MIG/TIG: Check gas flow, gas leaks, and correct gas type. Ensure consumables (contact tip, nozzle, tungsten) are in good condition.
  • All modes: Adjust welding current/voltage settings. Ensure workpiece is clean.
• Wire Feeding Problems (MIG):
  • Check wire spool for tangles or bird-nesting.
  • Adjust drive roller tension (too loose or too tight).
  • Inspect contact tip and liner for blockages or wear.
• Overheating: Allow the machine to cool down. Ensure adequate ventilation around the welder. Check the duty cycle limits.

7. Specifications

Detailed technical specifications for the JASIC NB-250 (N214II) welding machine:

8. User Tips

Enhance your welding experience with these practical tips:

• Practice on Scrap: Before working on your main project, practice on similar scrap material to fine-tune your settings and technique.
• Material Preparation: Always ensure your workpiece is clean and free of rust, paint, or grease for optimal weld penetration and quality.
• Understand Duty Cycle: Be aware of the machine's duty cycle (30% at 40℃). This indicates how long the machine can weld continuously within a 10-minute period before needing to cool down.
• Gas Flow Rate: For MIG/TIG, adjust your gas flow rate based on the environment (e.g., higher flow in drafty areas) and material thickness to ensure proper shielding.
• Consumable Matching: Always match your welding wire/electrode type and diameter to the material you are welding and the machine's capabilities.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your authorized JASIC dealer or the seller directly. Keep your purchase receipt as proof of purchase. For general inquiries, you may also reach out via the contact information provided by the seller.