MMA electrode with a basic flux system on a nearly matching core wire designed to give radiographically sound weld metal. It is optimised for DC+ welding in all positions including pipework in the ASME 5G/6G positions. Recovery is about 110% with respect to the core wire, and 65% with respect to the whole electrode.
Applications
Nimrod 657 (formerly 50.50.Nb) was developed in conjunction with Inco to match their proprietary cast alloy IN-657 produced by licenced foundries worldwide. It is also suitable to weld the Ti-bearing wrought version IN-671. Alloy 657 with its high chromium content has exceptional resistance to hot corrosion (800-950°C) by fuel ash containing vanadium pentoxide and alkali metal sulphates arising from the combustion of low-grade heavy fuel oils. IN-657 castings are used in a wide range of components in oil-fired furnaces and boilers such as tube sheets, tube hangers, supports and spacers in ships, power stations, refineries, and petrochemical plants.
Specification
AWS A5.11: ENiCrFe-2
BS EN 14172: E Ni6133
DIN 1736: EL-NiCr15MoNb (2.4625)