TOKO Welding Consumables Overview

TOKO 2535Nb NiCr Alloy Welding Rods

Premium nickel-chromium-based Welding rods | designed for specialized welding applications requiring exceptional resistance to high temperatures, oxidation, and corrosion. These rods are engineered for joining and repairing nickel-chromium alloys, particularly in demanding environments such as power plants, petrochemical facilities, and high-temperature industrial equipment.
TOKO 2535Nb Alloy Welding Rods

Key Features & Composition

  • Chemical Composition:
  • Nickel (Ni): Primary base metal (~25-35%), providing ductility and corrosion resistance.
  • Chromium (Cr): Enhances oxidation and scaling resistance at elevated temperatures (~20-25%).
  • Niobium (Nb): Added as a stabilizing element to prevent carbide precipitation and improve creep resistance.
  • Minor elements like manganese (Mn), silicon (Si), and molybdenum (Mo) may be included to refine weld properties.
  • Mechanical Properties:
    • Excellent high-temperature strength (up to ~1000°C/1832°F).
    • Superior resistance to thermal fatigue, sulfidation, and carburization.
    • Good toughness and ductility in both as-welded and heat-treated conditions.
  • Welding Characteristics:
    • Arc Stability: Smooth arc transfer with minimal spatter.
    • Slag Detachability: Self-lifting slag for easy removal.
    • Positional Welding: Suitable for flat and horizontal positions (typical for SMAW electrodes).
    TOKO 2535Nb MIG Welding Wire

    Applications

    • Repairing or welding nickel-chromium alloy components exposed to extreme heat (e.g., furnace parts, reformer tubes, heat exchangers).
    • Joining dissimilar metals where thermal expansion mismatch is a concern.
    • Used in industries such as:
      • Power generation (boilers, turbines).
      • Petrochemical (reactors, catalytic crackers).
      • Aerospace and thermal processing equipment.

    Welding Parameters & Handling

    • Preheat/Interpass Temperature: Typically 150–250°C (302–482°F) to avoid cracking.
    • Post-Weld Heat Treatment (PWHT): Optional, depending on application requirements (e.g., stress relieving).
    • Storage: Keep in dry conditions to prevent moisture absorption (use a rod oven if required).

    Compliance & Safety

    • Meets international standards such as AWS A5.11 (for nickel-alloy electrodes).
    • Safety Precautions: Use adequate ventilation to avoid inhalation of fumes containing nickel and chromium compounds.

    Why Choose TOKO 2535Nb Welding Rods?

    TOKO’s expertise in high-performance welding consumables ensures these rods deliver reliable, crack-free welds in critical high-temperature applications. Their balanced composition and controlled arc behavior make them ideal for maintaining structural integrity in aggressive environments.