2. FILLER METAL OF COBALT BASED ALLOYS

2.1 - Chemical composition of cobalt based weld wire
Table 2.1 - Chemical composition requirements for cobalt filler metals
2.1.1 - 5385
2.1.2 - 5789
2.1.3 - 5796
2.1.4 - 5801

2.1 Chemical composition of cobalt based weld wire. ñ Top

Table 2.1 gives chemical composition for filler metals of cobalt based alloys.

Table 2.1 - Chemical composition requirements for cobalt filler metals ñ Top

Weight Percent Œ
LAC STOCK # C Mn Si P S Cr Ni Mo B Fe W La
5385 0.20 to 0.30 1.00 1.00 0.040 0.040 25.00 to 29.00 1.75 to 3.75 5.00 to 6.00 0.007 3.00 - -
5789 0.45 to 0.55 1.00 1.00 0.040 0.040 24.50 to 26.50 9.50 to 11.50 - - 2.00 7.00 to 8.00 -
5796 0.05 to 0.15 1.00 to 2.00 1.00 0.040 0.030 19.00 to 21.00 9.00 to 11.00 - - 3.00 14.00 to 16.00 -
5801 0.05 to 0.15 1.25 0.20 to 0.50 0.020 0.015 20.00 to 24.00 20.00 to 24.00 - 0.015 3.00 13.00 to 16.00 0.02 to 0.12

ΠSingle values are maximum.

2.1.1 5385ñ Top

Although there is no AMS weld wire specification for this alloy, filler metal of 5385 is to be used for welding and repair of casting parts with similar composition.

2.1.2 5789ñ Top

Due to its very good stress-rupture and creep properties this filler metal is recommended for welding cobalt-based parts of gas turbines, and jet engines.

2.1.3 5796ñ Top

This filler metal is used in jet engine components, including turbine blades, combustion chambers, rings and afterburner parts exclusively because of its good corrosion resistance, and resistance to oxidation up to 1900°F.

2.1.4 5801ñ Top

Due to the addition of a small amount of lanthanum, this alloy, besides its excellent high temperature strength, has extraordinary resistance to oxidation up to 2100°F that allows it to be used successfully for gas turbines, airframe, chemical and nuclear applications.

© Lancaster Alloys Co.