BVAg-32 / PAL 25 Technical Data
BVAg-32 / PAL 25 can be used on any of the common ferrous and non-ferrous alloys. Due to its low vapor pressure compared to standard silver base filler metals, BVAg-32 / PAL 25 is suitable for use in all vacuum applications such as electronic valve construction and vacuum tube construction in the electronics industry. BVAg-32 / PAL 25 offer slow penetration of the substrates; therefore it is often recommended in brazing of thin wall assemblies such as honeycomb structures and heat exchangers. This alloy is often use in brazing of compressor stator assemblies.
The palladium content in BVAg-32 / PAL 25 inhibits the potential of stress corrosion cracking in iron-nickel base metals in comparison to standard silver-copper alloys. BVAg-32 / PAL 25 exhibits high corrosion and oxidation resistance.
Properties of Brazed Joints
The properties of a brazed joint are dependent upon the base metal, joint design and brazing technique. For controlled atmosphere brazing or vacuum brazing the recommended radial joint clearance for silver base alloys falls within 0.000in – 0.002in (0.00mm – 0.05mm) range.
BVAg-32 / PAL 25 conforms to American Welding Society (AWS) A5.8/A5.8M BVAg-32 Grade 1 & 2
Wire, strip, engineered preforms, specialty preforms per customer specification, powder and paste.
- AWS: BVAg-32
- Lucas: Premabraze 540
- UNS: P07547
- Brazing Temperature Range High: 1840 F / 1004 C
- Brazing Temperature Range Low: 1790 F / 977 C
- Liquidus: 1740 F / 949 C
- Solidus: 1650 F / 899 C
- Ag: 54%
- Pd: 25%
- Cu: 21%
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