Exaton Ni55 (GTAW)

Exaton Ni55 is a high‑alloy nickel‑chrome‑molybdenum filler metal (Alloy 686) designed for GTAW of nickel alloys and dissimilar joining of stainless steel to nickel alloys. It offers superior corrosion resistance and is ideal for overlay welding in harsh environments such as waste‑to‑energy boilers and petrochemical plants.

Key Features

• Highest alloyed Ni‑Cr‑Mo filler in the Exaton range
• Excellent corrosion resistance in aggressive media
• Suitable for overlay surfacing and dissimilar metal joining
• Consistent chemistry and mechanical properties batch‑to‑batch

Specifications

• Classifications: SFA/AWS A5.14 ERNiCrMo‑14, EN ISO 18274 S Ni 6686 (NiCr21Mo16W4)
• Alloy composition: Ni + 21.5 % Cr + 16 % Mo + 3.5 % W
• Shielding gas: I1, I3 (EN ISO 14175)
• Wire diameter: 2.0 mm (available in 1.6 mm, 2.0 mm, 2.4 mm)
• Tensile (As Welded): Yield 565 MPa, Tensile 815 MPa, Elongation 45 %
• Charpy impact (As Welded): 110 J @ 20 °C, 75 J @ ‑196 °C
• Typical weld metal analysis %: Ni 57.5, Cr 20.5, Mo 15.5, W 3.5, others trace

Applications

• Weld overlay of boiler tubes in waste‑to‑energy plants
• Petrochemical, chemical, oil & gas, marine environments
• Dissimilar joining of stainless steel to nickel alloys
• High‑temperature service up to 1200 °C (thermal stability limited)