AWS/ASME classification for a nickel-based welding electrode (like Inconel 625 filler) known for exceptional strength and corrosion resistance, used for welding nickel-chromium-molybdenum alloys, dissimilar metals (nickel to steel), and for cladding, offering performance from cryogenic to high temperatures (up to 1000F/540C) in severe environments like chemical processing, marine, and power generation. Its weld metal composition includes high levels of Nickel (Ni), Chromium (Cr), Molybdenum (Mo), and Niobium (Nb), providing superior resistance to pitting, crevice corrosion, and stress cracking in chloride-rich media.
Key Characteristics:
Composition: High Ni, Cr, Mo, with Nb (e.g., ~60Ni, 22Cr, 9Mo, 3.5Nb+Ta).
Performance: High strength, excellent toughness, and superior resistance to corrosion (pitting, crevice, stress corrosion cracking).
Temperature Range: Effective from cryogenic temperatures up to around 1000F (540C).
Weldability: Low-hydrogen coating, good operability, suitable for all-position welding, stable arc.
Common Applications:
Joining: Inconel 625, 825, Alloy 20, and dissimilar joints between nickel alloys, stainless steels, and carbon steels.
Surfacing/Cladding: Overlaying steel for corrosion protection in heat exchangers, marine components, and chemical equipment.
Industries: Chemical processing, power generation, petrochemical, nuclear, and marine.