CDA 773
AWS: RBCuZn-D
Nickel silver is a low fuming, cadmium free bronze. It is an excellent replacement for high cost silver brazing alloys when higher brazing temperatures are acceptable. The weld deposits of nickel silver have very high tensile strength, good ductility and excellent corrosion resistance. Nickel silver weld deposits are also machinable and work-harden when put into service. Suitable for tubular structures. Nickel silver is available pre-flux coated with the correct amount of flux. No dipping or preparatory work is necessary. Preheating may be desired for some applications. A neutral or slightly oxidizing flame is recommended. Applications Include: • Brazing tungsten carbides, copper alloys, nickel alloys, stainless steels and carbon steels. • Brazing or oxyacetylene welding of steel or cast iron where good color match is desired. • Building-up or overlaying worn parts such as gear teeth, bearings and valve seats
Available Forms
Wire, strip, engineered preforms, specialty preforms per customer specification, powder and paste.
Characteristics
CDA 773 has good wetting characteristics on ferrous and non-ferrous materials particularly steels and coppers. Maximum strength and joint integrity are obtained where joint clearance falls within the range of 0.003in – 0.005in per side. Heating methods include torch, induction and furnace. Unsuitable for brazing in a protective atmosphere.
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)
RBCuZn-D
Solidus
1690 F / 921 C
Liquidus
1715 F / 935 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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