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FAQ

  • Q Why Is My MIG Welding Torch Not Feeding Wire Properly?

    A
    A MIG welding torch may fail to feed wire properly due to several common causes, including worn drive rolls, a clogged liner, incorrect drive roll tension, a damaged contact tip, or poor-quality welding wire. Dirt, rust, and debris inside the wire feeding system can also create resistance and interrupt smooth wire delivery.
     
    To troubleshoot MIG wire feed problems, inspect the wire spool for tangles, check that the drive rolls match the wire size, clean or replace the torch liner, and ensure the contact tip is not blocked or worn. Regular maintenance of the MIG welding torch and wire feeder system helps prevent feeding issues, improves arc stability, and ensures consistent weld quality.
     
    If wire feeding problems persist, replacing worn consumables such as contact tips, liners, and drive rolls is often the most effective solution.

  • Q What thickness can a plasma cutter cut?

    A
    Cut capacity depends on the machine's amperage. As a rough guide: a 45 A system cuts up to ~1/2 in (12 mm), a 65 A system up to ~3/4 in (20 mm), and 85–105 A systems cut 1 in (25 mm) and thicker. Manufacturers list both a rated (quality) cut and a thicker sever cut — use the rated capacity for clean, production-quality edges.
     

  • Q What causes too much dross on plasma cuts?

    A
    Excessive dross is usually caused by cutting too fast or too slow, a worn nozzle, incorrect amperage, or too much standoff height. High-speed dross (thin, hard top spatter) means speed is too high; low-speed dross (heavy bottom beads) means speed is too low. Dial in the speed/amperage from your cut chart and replace worn consumables to get a clean, dross-free edge.

  • Q Why won't my plasma torch cut all the way through the metal?

    A
    If your plasma torch won't cut through, the most common causes are worn consumables, amperage too low for the thickness, cutting speed too fast, or insufficient air pressure. Confirm the material thickness is within your machine's rated cut capacity, install fresh consumables, slow your travel speed, and verify gas pressure at the recommended setting.

  • Q When should I replace my plasma cutter electrode and nozzle?

    A
    Replace the electrode when the center pit (the small hafnium divot) reaches about 1/16 in (1.5 mm) deep. Replace the nozzle when the orifice becomes oval, oversized, or burnt instead of round. Worn consumables are the #1 cause of poor cut quality and expensive torch failures, so inspect them whenever cut angle, dross, or arc stability changes.

  • Q How long do plasma torch consumables last?

    A
    A set of plasma torch consumables typically lasts 1 to 3 hours of arc-on time for mechanized cutting around 100–120 A, or roughly several hundred to a few thousand pierces for hand cutting. Real life depends on material thickness, amperage, pierce height, and gas quality. Electrodes are usually the first part to wear out, followed by nozzles.

  • Q Why does my TIG torch overheat?

    A
    A TIG torch overheats when it is run beyond its amperage/duty-cycle rating, has loose consumable connections, or lacks adequate cooling. Loose collets, collet bodies, or gas caps create resistance heating. Tighten all connections, stay within the torch's rated amperage, and switch to a water-cooled torch for high-amperage or long-duration welding to prevent overheating.

  • Q What shielding gas and flow rate should I use for TIG welding?

    A
    TIG welding uses 100% argon for most steels and aluminum, typically flowing at 15–25 CFH (cubic feet per hour). Too little gas causes contamination and porosity; too much creates turbulence that pulls in air. Use adequate pre-flow and post-flow to protect the tungsten and weld, and increase flow slightly in drafty conditions.
     

  • Q What size tungsten do I need for TIG welding?

    A
    Match the tungsten diameter to your amperage and material thickness. As a general guide: 1/16 in (1.6 mm) for roughly 20–90 A, 3/32 in (2.4 mm) for about 60–150 A, and 1/8 in (3.2 mm) for around 130–250 A. Too large a tungsten for low amperage causes an unstable arc; too small overheats and spits tungsten into the weld.
     

  • Q When should I use a water-cooled vs. air-cooled TIG torch?

    A
    Use an air-cooled TIG torch for light to medium work, typically up to ~150–200 A and intermittent welding. Choose a water-cooled torch for high-amperage (200 A+), long-duration, or production welding where an air-cooled torch would overheat. Water-cooled torches run cooler and lighter in the hand but require a coolant system, so match the torch to your amperage and duty cycle.
     

  • Q What angle should I grind my TIG tungsten?

    A
    Grind the tungsten to a taper length of about 2 to 2.5 times the electrode diameter, which generally falls in the 20–35° point range. A sharper point gives easier arc starts and a tighter arc for thin metal; a blunter point handles higher amperage and lasts longer. Always grind lengthwise so the scratches run parallel to the electrode for a stable arc.

  • Q Why does my TIG tungsten keep getting contaminated?

    A
    Tungsten contamination usually happens when the electrode touches the weld pool or filler rod, gas coverage is inadequate, or amperage is too low for the tungsten size. The result is a black, dirty weld and an erratic arc. Maintain proper arc length, ensure correct shielding-gas flow and pre/post-flow, and re-grind the tungsten on a dedicated wheel to restore a clean, stable arc.

  • Q Why is my MIG weld producing too much spatter?

    A
    Excessive spatter usually points to incorrect voltage or wire feed speed, wrong gas or gas flow, a worn contact tip, or poor work-clamp ground. Re-balance your voltage and wire feed settings, verify shielding gas type and flow rate, replace worn consumables, and ensure a clean ground connection for a cleaner, lower-spatter weld.
     

  • Q How do I choose the right contact tip size for my MIG wire?

    A
    Match the contact tip to the exact wire diameter marked on it (e.g., a 0.035 in tip for 0.035 in wire). Using a tip that is too large causes erratic arc and poor current transfer; too small causes feeding resistance and burnback. Always confirm the wire size and select the correct corresponding tip and liner.

  • Q Why is my MIG wire not feeding smoothly?

    A
    Erratic or stuttering wire feed usually comes from a dirty or worn liner, incorrect drive-roll tension, a worn contact tip, or a kinked/too-tightly-coiled gun cable. Debris in the liner is one of the most common causes. Clean or replace the liner, set proper tension, match the tip and rolls to the wire size, and keep the gun cable as straight as possible.

  • Q What causes burnback on a MIG gun?

    A
    Burnback (the wire fusing to the contact tip) is most often caused by wire feed speed too low, the contact tip too close to the work, excessive heat, or a worn/wrong-sized tip. The arc burns back up the wire into the tip. Increase wire feed speed, set the correct stickout, and use the right contact tip to prevent it.

  • Q Why does my MIG wire keep birdnesting?

    A
    Birdnesting (wire tangling at the drive rolls) is usually caused by too much or too little drive-roll tension, a wrong-sized or dirty liner, the wrong drive rolls for the wire, or a blocked contact tip. The wire jams downstream and piles up at the feeder. Fix it by setting correct tension, matching liner and drive rolls to the wire size, cleaning the liner, and replacing a clogged tip.

  • Q How often should I change my MIG contact tip?

    A
    Replace your MIG contact tip when the bore becomes oblong or oversized instead of round, when you notice erratic arc, increased spatter, or porosity. For most production work that means every few hours to once per shift, though heavy or high-amperage welding wears tips faster. A worn contact tip causes poor electrical transfer and inconsistent welds, so inspect it regularly rather than running it to failure.

  • Q Are Welding Fumes Dangerous?

    A

    Yes. Welding fumes can be hazardous to health, particularly when workers are exposed repeatedly or at high concentrations. Depending on the welding process and materials, fumes may contain fine particles and substances such as manganese, chromium, nickel, and other contaminants that can affect the respiratory system and contribute to occupational health risks.

  • Q Are Welding Fumes Carcinogenic?

    A

    Welding fumes are classified as carcinogenic to humans by the International Agency for Research on Cancer (IARC). The composition of welding fumes varies significantly, so the specific hazards depend on the welding process, materials, coatings, and contaminants involved.

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