ASME SFA 5.15
High nickel alloy bare wire for TIG or MIG cast iron welding. Nickel 99T and 99Mare the TIG (99T) or MIG (99M) equivalents to Nickel 99 electrode. It is developed primarily for automatic and semi-automatic welding of ductile, malleable or gray cast iron to itself or dissimilar metals such as low alloy and carbon steel, stainless steel, iron, copper Monel®, etc. Nickel 99T and 99Mare excellent for the buildup of worn parts, repairing machining errors or detective castings where maximum machineability of the deposit is required. Nickel 99T and 99M can be used in any position. Produces high quality welds with a minimal amount of effort. Weld deposits are strong, dense and fully machinable. Color will match that of cast iron.
PROCEDURES: Clean the joint area. Bevel heavy sections. Preheating is requiredas itis useful in relieving stresses and to increase machinability of the weld deposit in parts greater than 1/2” thick. 600°F is an acceptable preheat temperature. Use DC-(straight polarity) in TIG applications, with the oscillating technique and DC+ (reverse polarity) in MIG applications, with the stringer bead technique. The oscillating technique will produce the lowest weld metal dilution. When using the stringer bead technique, be sure to strike the arc on the edge of previously deposited weld metal. This will reduce dilution. Do not let the part become too hot during welding. Gradual cooling of the weld metal is recommended.
TYPICAL WIRE CHEMISTRY (%)
Typical mechanical properties of weld metal (C02 shielding gas)
Yield strength (psi)
Ultimate tensile strength (psi)
Elongation in 2" (%)
Reduction of Area