MMA electrode with a basic flux system made on a 625-core wire. The electrode is designed to combine easy operation with the deposition of high-quality, radiographically sound weld metal and a finished bead of good appearance. Nimrod 625KS is optimised for DC+ welding in all positions including pipework qualified in the ASME 6G position. Recovery is about 120% with respect to the core wire, and 65% with respect to the whole electrode.
Applications
These consumables are designed to match the composition and properties of alloy 625. Originally developed to give high-temperature strength and structural stability, alloy 625 is also widely used for its resistance to general corrosion, pitting, crevice and stress corrosion cracking in severe chloride media. These properties are conferred by high levels of chromium, molybdenum and niobium, which also raise the strength to the highest amongst standard nickel-base alloys. Useful properties from –269°C to above 1000°C are achieved. In addition to matching alloy 625, suitable for welding heat-resisting alloys including Inconel 601 (except severe sulphidising conditions), Incoloy 800/800H (preferred to Nimrod AKS above about 900°C), or combinations of these with other alloys for furnace equipment, petrochemical and power generation plants. Some other applications include: Overmatching corrosion-resistant welds in alloy 825, Hastelloys G and G3, alloy 28, 904L, 6%Mo super-austenitic stainless 254SMo, and also overlays on pumps, valves and shafts, often in offshore and marine environments where high pitting resistance (PRE = 50) and tolerance to weld metal dilution are essential. Welds in high-strength ferrous alloys including cryogenic 9% nickel steels and for reclamation of dies where rapid work-hardening and toughness are required.
Specification
AWS A5.11: ENiCrMo-3
BS EN 14172: E Ni 6625