| Silvaloy
A-40T (BAg-28) |
 |
| Nominal Composition: |
|
|
| Silver |
|
40.0
± 1.0% |
| Copper |
|
30.0 ± 1.0% |
| Zinc
|
|
28.0
± 2.0 % |
| Tin |
|
2.0
± 0.5 % |
| Total
Other Elements |
|
0.15%
Max. |
| Physical Constants: |
|
|
| Solidus |
|
1200°F
(649°C) |
| Liquidus |
|
1310°F
(710°C) |
| Brazing
Range |
|
1310-1550°F
(618-760°C) |
| Specific
Gravity |
|
9.03 |
| Density
(T.oz./cu.in.) |
|
4.76 |
| Electrical
Conductivity (% IACS) |
|
18.0 |
| Electrical
Resistivity (Microhm-cm) |
|
9.60 |
| Color |
|
Pale
Yellow |
DESCRIPTION:
Silvaloy A-40T is a good general purpose, low melting, cadmium-free
alloy, often selected for its low temperature, wetting and good
flow. Silvaloy A-40T has a lower brazing temperature with a relatively
narrower melting range than other cadmium-free classifications
with similar silver content. This alloy is particularly useful
for joining steel, copper and copper alloys. It has proven most
suitable for torch brazing with manual feeding into a joint where
heating may not be consistent. It is also suitable for preplacing
as a ring or punching. It does not liquidate excessively if heated
slowly through its melting range.
PROPERTIES
OF BRAZED JOINTS:
Generally, the joint strength using Silvaloy A-40T will surpass
the strengths of the base metals being joined, type of joint,
design of joint, joint clearances and brazing procedures. The
recommended maximum operating temperature for Silvaloy A-40T is
up to 400°F in continuous service and up to 600°F in intermittent
service. Where improved corrosion resistance is needed, Silvaloy
50N and Silvaloy A-40N2 are recommended over silver base filler
metals not containing nickel.
APPLICATIONS:
Typical applications are the joining of ferrous, nonferrous and
dissimilar metals and alloys with close joint clearances.
| SPECIFICATIONS: |
|
AWS
A5.8
|
BAg-28 |
SAFETY INFORMATION:
It is essential that adequate ventilation be provided so that
personnel will not inhale gases and fumes while brazing. The operation
and maintenance of brazing equipment or facility should conform
to the provisions 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 A-40T.
AVAILABLE
FORMS:
Standard forms of Silvaloy A-40T are wire and preforms.
|
