|
| Silvaloy
5 (BCuP-3) |
|
| Nominal Composition: |
|
|
| Silver |
|
5.00
± 0.20% |
| Phosphorus |
|
6.00 ± 0.20% |
| Copper
|
|
Balance |
| Total
Other Elements |
|
0.15%
Max. |
| Physical Constants: |
|
|
| Solidus |
|
1190°F
(643°C) |
| Liquidus |
|
1495°F
(813°C) |
| Brazing
Range |
|
1325-1500°F
(718-816°C) |
| Specific
Gravity |
|
8.13 |
| Density
(lb/cu in) |
|
0.294 |
| Electrical
Conductivity (% IACS) |
|
9.6 |
| Electrical
Resistivity (Michrohm-cm) |
|
18.1 |
| Color |
|
Light
Copper |
DESCRIPTION:
Silvaloy 5 is used for the brazing of copper and copper alloys,
brass, and bronze. It can also be used on silver, tungsten, and
molybdenum. It is primarily used for the joining of copper-to-copper.
Silvaloy 5 should not be used on ferrous metals or copper alloys
containing more than 10% nickel because of phosphorus embrittlement
due to reaction with iron or nickel. Silvaloy 5 has good flow
and wetting properties on copper, brass, and bronze. Its melting
characteristics are such that on the low end of its brazing temperature
range it has “sluggish” flow characteristics which enable it to
fill gaps better, making it ideal for loose-fitting joints. On
the other hand, when brazing at the high end of its brazing temperature
range, it is very fluid, making ideal for tight-fitting joints
requiring deep penetration.
PROPERTIES
OF BRAZED JOINTS:
Generally, the joint strength using Silvaloy 5 will surpass the
strengths of the base metals. Strength is a function of the base
metals being joined, type of joint, design of joint, joint clearance
and brazing procedures. The recommended maximum operating temperature
for Silvaloy 5 are 300°F (continuous service) and 400°F (short-time
service). Corrosion-resistance is satisfactory except when the
joint is in contact with sulfurous atmosphere (especially at elevated
temperatures).
APPLICATIONS:
The phosphorus content of Silvaloy 5 acts as fluxing agent and
no flux is necessary when brazing copper-to-copper joints. However,
when used with a copper alloy or one of the other brazeable metals,
a brazing flux must be used to promote wetting, bonding, and flow
throughout the joint. The flow point of Silvaloy 5 is 1325°F (718°C).
| SPECIFICATIONS: |
|
AWS
A5.8
|
BCuP-3 |
| ASME |
BCuP-3 |
| QQ-B-650
|
BCuP-3 |
SAFETY
INFORMATION:
The operation and maintenance of brazing equipment or facility
should conform to the provision of American National Standard
(ANSI) Z49.1, “Safety in Welding and Cutting.” For more complete
information, refer to the Material Safety Data Sheet for Silvaloy
5.
AVAILABLE
FORMS:
Standard forms of Silvaloy 5 are wire and preforms.
|
|
