The Century FC-90 welder, a versatile machine, offers capabilities for stick, MIG, and TIG welding.
It’s a popular choice for both beginners and experienced welders seeking a reliable and adaptable tool for various projects.

Overview of the Century FC-90

The Century FC-90 is a multi-process welder designed to handle a wide range of welding applications. It’s known for its user-friendly interface and robust construction, making it suitable for both home workshops and professional environments. This machine excels in stick (SMAW), MIG (GMAW), and TIG (GTAW) welding, offering versatility for diverse metalworking tasks.

Its compact design doesn’t compromise power; the FC-90 delivers sufficient amperage for welding various thicknesses of steel, stainless steel, and aluminum. The welder’s controls are intuitively laid out, allowing for precise adjustments to voltage and amperage. It’s a dependable unit, often favored for automotive repair, fabrication, and general maintenance work, providing a solid foundation for welding endeavors.

Key Features and Specifications

The Century FC-90 boasts several key features, including multi-process capability – stick, MIG, and TIG – within a single unit. Input power is typically 120/240V, offering flexibility for different power sources. Amperage output ranges are generally 70-200 amps, suitable for various material thicknesses. Duty cycle at 200 amps is around 20%, increasing at lower amperages.

It features hot start and arc force control for stick welding, enhancing arc stability. MIG welding benefits from adjustable wire feed speed and voltage control. The unit’s weight is approximately 45 pounds, making it relatively portable. Standard accessories often include a welding cable, electrode holder, ground clamp, and MIG gun. It’s a well-rounded machine designed for practical welding needs.

Safety Precautions

Welding demands strict safety adherence. Always wear proper PPE – helmet, gloves, jacket – and ensure adequate ventilation. Avoid flammable materials and be mindful of electrical hazards.

General Welding Safety

Prioritizing safety is paramount when operating any welding equipment, including the Century FC-90. Always wear a properly fitted welding helmet with the correct shade lens to protect your eyes from intense UV and infrared radiation. Flame-resistant clothing, such as a welding jacket and gloves, is crucial to shield your skin from sparks, heat, and potential burns.

Ensure the work area is well-ventilated to avoid inhaling harmful fumes produced during welding. Remove any flammable materials – paper, wood, liquids – from the vicinity. Be aware of potential electrical hazards; never weld in damp environments or with wet gloves. Inspect all cables and connections for damage before each use. A fire extinguisher should be readily accessible. Finally, never weld on pressurized containers!

Specific Safety Considerations for the FC-90

The Century FC-90, while user-friendly, demands specific safety attention. Due to its multi-process capability, ensure the correct polarity and settings are selected for the chosen welding method (Stick, MIG, or TIG). Incorrect settings can lead to unstable arcs and increased spatter, posing burn risks.

Pay close attention to the duty cycle of the FC-90; exceeding it can cause overheating and potential damage. Allow the welder to cool down appropriately between extended welding sessions. Regularly inspect the gas hose (if using MIG or TIG) for leaks, as gas buildup can be hazardous. Always disconnect the power supply before performing any maintenance or changing consumables. Proper grounding is vital to prevent electric shock.

Setting Up the FC-90 Welder

Proper setup is crucial for safe and effective operation. This involves securely connecting the power cable, establishing a solid ground connection, and configuring gas flow if needed.

Connecting the Power Supply

Before connecting the Century FC-90 to a power source, ensure the welder is switched off. Verify your power supply matches the welder’s voltage requirements – typically 120V or 240V, as indicated on the unit’s label. Use a dedicated circuit to avoid overloading.

Connect the appropriate plug to the receptacle, ensuring a secure fit. Never use adapters or extension cords unless absolutely necessary, and if used, they must be heavy-duty and rated for the welder’s amperage. Inspect the power cord for any damage before each use. A damaged cord presents a serious electrocution hazard and should be replaced immediately by a qualified technician. Always double-check all connections before powering on.

Grounding Procedures

Proper grounding is crucial for safety when operating the Century FC-90 welder. Connect the ground clamp from the welder to a clean, unpainted metal surface of the workpiece. Ensure a solid, metal-to-metal contact for effective grounding. Avoid attaching the clamp to coated surfaces, as they impede electrical flow.

If the workpiece isn’t grounded, connect the ground clamp directly to the welding table or a known good earth ground. Regularly inspect the ground clamp and cable for corrosion or damage, replacing them if necessary. A poor ground connection increases the risk of electric shock and can affect weld quality. Always prioritize a secure and reliable ground path before initiating any welding operation.

Gas Setup (if applicable)

For MIG and TIG welding with the Century FC-90, a shielding gas is essential to protect the weld pool from atmospheric contamination. Connect the gas cylinder regulator to the gas cylinder, ensuring a tight seal. Attach the gas hose to the regulator and the welder’s gas inlet.

Purge the gas line before welding by briefly opening the gas valve to expel any air or contaminants. Set the gas flow rate according to the welding process and material thickness, typically between 15-25 cubic feet per hour (CFH). Regularly check for gas leaks using a soap solution. Always use the correct shielding gas for the specific welding application to achieve optimal results.

Welding Techniques with the FC-90

The Century FC-90 excels in stick, MIG, and TIG welding. Mastering each process requires understanding proper settings, electrode selection, and travel speed for quality welds.

Stick Welding (SMAW) with the FC-90

For stick welding (SMAW) with the Century FC-90, select the appropriate electrode based on the metal type and thickness; Adjust the amperage setting on the control panel; a lower amperage suits thinner materials, while thicker metals require higher settings.

Ensure a proper arc length – typically equal to the electrode diameter – for stable welding. Use a consistent travel speed to create a uniform bead. Practice striking an arc cleanly to avoid sticking the electrode. The FC-90’s adjustable hot start feature can aid in initiating the arc, particularly with difficult-to-start electrodes. Remember to maintain a safe distance from fumes and wear appropriate personal protective equipment, including a welding helmet and gloves.

MIG Welding (GMAW) with the FC-90

MIG welding (GMAW) on the Century FC-90 requires setting the wire feed speed and voltage. Select the correct wire type and diameter for the material being welded. Start with lower settings and gradually increase voltage until a stable arc is achieved.

Maintain a consistent travel speed and work angle for a clean weld bead. The FC-90’s adjustable drive roll tension ensures smooth wire feeding. Proper shielding gas flow is crucial; adjust the gas flow rate according to the material and welding position. Be mindful of potential spatter and ensure adequate ventilation. Always wear a welding helmet, gloves, and appropriate clothing for protection.

TIG Welding (GTAW) with the FC-90

TIG welding (GTAW) with the Century FC-90 demands precision. Select the appropriate tungsten electrode type and diameter, sharpening it to a point. Establish a stable arc by controlling the foot pedal or amperage control. Shielding gas, typically argon, is essential for protecting the weld pool from contamination.

Maintain a short arc length and consistent travel speed. The FC-90 allows for pulse settings, enhancing control and weld quality. Practice proper torch angle and filler metal addition techniques. Always prioritize safety, wearing a welding helmet with a dark shade lens, gloves, and protective clothing. Ensure adequate ventilation due to fumes.

Troubleshooting Common Issues

Addressing problems with the Century FC-90 often involves checking power connections, ground clamps, and gas flow. Consistent arc starts and stable welds are key indicators.

Welder Not Powering On

If the Century FC-90 fails to power on, begin with the most basic checks. Ensure the power cord is securely connected to both the welder and a functioning electrical outlet. Verify the outlet is providing power by testing it with another device.

Next, inspect the welder’s main power switch, located typically on the front or rear panel, confirming it’s in the ‘on’ position. Examine the input voltage selector switch (if equipped) to ensure it matches your supply voltage.

Check the circuit breaker or fuse within the welder; a tripped breaker or blown fuse will prevent operation. Replace any blown fuses with the correct amperage rating. If the issue persists, consult a qualified electrician to rule out electrical supply problems or internal welder faults.

Arc Instability

Arc instability with the Century FC-90 often manifests as sputtering, inconsistent weld beads, or frequent arc outages. First, verify a clean and secure workpiece ground connection – a poor ground is a common culprit. Ensure the electrode (stick welding) or wire (MIG welding) is within the recommended specifications for the material being welded.

Adjust the welding current (amperage) and voltage settings. Too low a current can cause the arc to extinguish, while too high can lead to spatter and instability. For MIG welding, check the wire feed speed and tension.

Inspect the welding cables for damage or corrosion, as these can impede current flow. Finally, ensure proper shielding gas coverage (MIG/TIG) to protect the weld pool from atmospheric contamination.

Burn Back Issues

Burn back, where the welding wire melts back into the contact tip during MIG welding with the Century FC-90, indicates a problem with the welding parameters or setup. A primary cause is often an excessively high voltage setting, forcing too much current through the wire. Reduce the voltage incrementally and test the weld.

Verify the wire feed tension is adequate; insufficient tension allows the wire to buckle and burn back. Ensure the contact tip is the correct size for the wire diameter and is in good condition – replace if worn or damaged.

Check the gas flow rate; inadequate shielding gas can contribute to burn back. Finally, inspect the work clamp connection for proper grounding.

Maintenance and Care

Regular maintenance of your Century FC-90 welder ensures optimal performance and longevity. Cleaning, inspection of cables, and proper storage are crucial steps.

Cleaning the FC-90

Maintaining a clean Century FC-90 welder is paramount for reliable operation and preventing potential issues. After each use, disconnect the power source and allow the unit to cool completely before commencing any cleaning procedures. Use a dry brush or compressed air to remove dust, debris, and metal shavings from the exterior surfaces, focusing on ventilation openings to ensure adequate airflow.

Avoid using solvents or abrasive cleaners, as these can damage the finish or internal components. For stubborn residue, a slightly damp cloth may be used, but ensure it is thoroughly dried afterward. Regularly inspect and clean the welding cable connections, ensuring they are free from corrosion; A clean welder operates more efficiently and extends the lifespan of your valuable equipment.

Inspecting Cables and Connections

Regularly inspecting the cables and connections of your Century FC-90 welder is crucial for safe and efficient operation. Before each use, visually examine the welding cable, ground cable, and electrode holder for any signs of damage, such as cracks, fraying, or exposed wires. Ensure all connections are tight and free from corrosion.

Loose or corroded connections can cause arc instability and pose a safety hazard. Clean any corroded connections with a wire brush or sandpaper, and re-tighten them securely. Replace damaged cables immediately. Pay close attention to the electrode holder, ensuring it’s securely attached and free from excessive wear. Proper cable and connection maintenance ensures a stable arc and minimizes the risk of electrical shock.

Storage Recommendations

Proper storage of your Century FC-90 welder is essential to maintain its performance and longevity. When not in use, store the welder in a clean, dry, and well-ventilated area, protected from dust, moisture, and extreme temperatures. Covering the welder with a protective cover will help prevent dust accumulation and damage.

Avoid storing the welder outdoors or in damp environments, as this can lead to corrosion and electrical hazards. Ensure the cables are neatly coiled and stored separately to prevent tangling and damage. Disconnect the power cord and any gas cylinders before storing the welder. Following these storage recommendations will help ensure your Century FC-90 remains in optimal working condition for years to come.

Parts and Accessories

Genuine Century FC-90 replacement parts and compatible accessories—like welding cables, electrodes, and gas nozzles—are readily available to ensure optimal performance.

Available Replacement Parts

Maintaining your Century FC-90 welder requires access to reliable replacement parts. Commonly needed items include contact tips, nozzles, diffusers, and drive rolls for the MIG gun, ensuring smooth wire feeding. Electrode holders, ground clamps, and welding cables are essential for stick welding operations, and these wear over time. For TIG welding, tungsten electrodes, gas lenses, and ceramic cups are frequently replaced.

Internal components like diodes, rectifiers, and transformers may occasionally need replacement, requiring a qualified technician. Century offers a comprehensive parts catalog, often available online or through authorized distributors, detailing part numbers and compatibility. Utilizing genuine Century parts guarantees proper fit and performance, extending the welder’s lifespan and maintaining warranty validity.

Compatible Accessories

Enhancing the functionality of your Century FC-90 welder is easily achieved with compatible accessories. A welding helmet with auto-darkening features is crucial for eye protection, while welding gloves and a jacket provide essential skin coverage. Various MIG guns, including spool guns for aluminum, expand welding capabilities.

For TIG welding, a foot pedal offers precise amperage control. Welding carts provide mobility, and clamps and pliers aid in workpiece handling. Consider a fume extractor for improved air quality. Century and third-party manufacturers offer a wide range of accessories designed specifically for the FC-90, ensuring seamless integration and optimal performance. Always verify compatibility before purchasing to maximize your welding experience.

Understanding the Control Panel

The FC-90’s control panel features amperage selection, voltage adjustment, and polarity switching. These controls dictate weld characteristics, influencing penetration and bead appearance.

Detailed Explanation of Each Control

Amperage Control: This knob regulates the welding current, directly impacting heat input and weld puddle size. Higher amperage settings are suitable for thicker materials, while lower settings are ideal for thinner metals. Precise adjustment is crucial for optimal results.

Voltage Control (MIG/TIG): Primarily used in MIG and TIG modes, the voltage control adjusts the electrical potential, influencing arc length and weld bead profile. Fine-tuning voltage ensures a stable arc and proper metal deposition.

Polarity Switch: The FC-90 allows switching between DCEN (electrode negative) and DCER (electrode positive) polarity. DCEN is commonly used for stick welding with most electrodes, while DCER is suitable for certain applications like TIG welding with specific tungsten types.

Mode Selector: This switch selects the desired welding process – Stick (SMAW), MIG (GMAW), or TIG (GTAW). Ensure the correct mode is selected before initiating a weld.

Adjusting Welding Parameters

Material Thickness: Select amperage based on the metal’s thickness. Thicker materials require higher amperage for adequate penetration. Consult welding charts for specific recommendations.

Electrode Type (Stick): Different electrodes demand varying amperage settings. Refer to the electrode manufacturer’s guidelines for optimal performance. Adjust polarity accordingly – typically DCEN for most stick electrodes.

Wire Feed Speed (MIG): In MIG welding, synchronize wire feed speed with voltage. Higher speeds necessitate increased voltage for a stable arc. Experiment to find the sweet spot for your material and wire type.

Gas Flow Rate (TIG/MIG): Proper shielding gas coverage is vital. Adjust flow rates based on the welding environment and joint configuration. Insufficient gas leads to porosity, while excessive gas can cause turbulence.