|
Of all
brazing processes, the most variables are presented when
brazing in atmosphere or vacuum. Among these are the type
of base and filler metal used, type of atmosphere, dew point,
temperature, and even furnace construction. Most furnace
brazing pastes are supplied without flux, consisting only
of atomized filler metal and a neutral binder.
Fusion
offers a full line of controlled atmosphere brazing pastes
for various base metals and filler metals. The filler metals
include copper and copper based alloys, including copper/phosphorous
based systems, silver brazing alloys, and aluminum based
filler metals.
|
|
EXO
- Typically
first choice for copper brazing in exo/endo atmospheres
- Minimal
to no residue under broad range of part cleanliness and
atmosphere conditions
- Not
recommended for H2:N2
atmospheres
- No
hot or cold slump
- Non-spattering
- Compatible
with wide range of metal concentrations
- Easily
dispensed through "squeeze bottles"
- Adheres
to part after drying
- Good
water washable cleaning properties
CCL
- Leaves
minimal to no residue
- No
hot or cold slump; non-spattering
- Suitable
for exo/endo atmospheres, H2:N2
atmospheres, and vacuum
- Compatible
with wide range of metal concentrations
- Easily
dispensed through "squeeze bottles"
- Adheres
to part after drying
- Ideal
for vertical or "upside down" joints
CDW
- Similar
to CBL with improved/reduced stringiness and less hot/cold
slump
- Cleaning
properties with water better than CBL, but not as water
washable as EXO and CCL
- Adheres
to part after drying
- Ideal
for extremely low dew point hydrogen atmosphere
|
CNT, CNG,
CKW
- Suitable
for either atmosphere or vacuum brazing
- Low
ash value
- Leaves
minimal to no residue where low dew points (minimum 20°
or below) and high temperatures (1800° or above) are
maintained.
CBL, CBC,
CFW
- Non-drying,
neutral binders for atmosphere brazing
- Restrictive
flow and slump properties permit use on most vertical
joints
- Flow
properties may be modified with additives depending on
the application
PNP
- Recommended
where dew points are marginal and furnace temperatures
are in the lower (silver brazing) range
- Not
recommended for use on vertical joints due to pronounced
slump in both hot and cold stages
CAP
- Suitable
for use in H2:N2
and dissociated ammonia atmospheres with with low dew
points (0 to -30°F)
- Leaves
no residue under these conditions
- Also
suitable for use in vacuum furnaces
|
