Silver Alloy 50Ni3
AWS: BAg-3
Silver Alloy 50Ni3 is recommended for use on stainless steels subject to chloride corrosion, such as marine hardware, fishing tackle, and come dairy equipment cleaned with bleaching solutions and other equipment exposed to chlorinated water. While Silver Alloy 50Ni3 is used successfully on many stainless steel assemblies where corrosion in service is not severe, it is better and safer to use Silver Alloy 50Ni3 for all stainless steel joints where the end use is not known. Silver Alloy 50Ni3 should not be used where the joints are exposed to direct contact with food, because of its cadmium content. Silver Alloy 50Ni3 is used extensively in brazing tungsten carbide inserts for wood and metal cutting, and for mining tools. It is also recommended for the brazing of aluminum bronze to steel as the nickel content offsets the harmful effect of diffusion of aluminum into the brazing alloy.
Available Forms
Wire, strip, engineered preforms, specialty preforms per customer specification, powder and paste.
Characteristics
Silver Alloy 50Ni3 differs from most other silver brazing filler metals in that it is rather sluggish even at temperatures above its flow point. For this reason it will fill larger gaps that more fluid alloys and may be used where clearances between joint surfaces cannot be kept within the tolerance normally recommended. This characteristic makes it easier to produce large fillets where fillets are required for appearance or affecting the distribution of stresses in an assembly. Silver Alloy 50Ni3 has a tendency liquate (separate into low and high melting constituents) and is preferably used where the assembly is to be heated rapidly through the melting range of the filler metal. It is not a good alloy for furnace brazing where it can be pre-placed internally in the joint area in the form of shims or rings, and where heating is rapid.
Properties
The properties of a brazed joint are dependent upon numerous factors including base metal properties, joint design, metallurgical interaction between the base metal and the filler metal.
Specs
American Welding Society (AWS)
BAg-3
Solidus
1170 F / 632 C
Liquidus
1270 F / 688 C
Disclaimer
The information and recommendations contained in this publication have been provided without charge & compiled from sources believed to be reliable and to represent the best information available on the subject at the time of issue. No warranty, guarantee, or representation is made by the Prince and Izant Company, Inc. as to the absolute correctness or sufficiency of any representation contained in this and other publications; Prince and Izant Company, Inc. assumes no responsibility in connection therewith; nor can it be assumed that all acceptable safety measures are contained in this (and other publications, or that other or additional measures may not be required under particular or exceptional conditions or circumstances.
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