Brazing; Characteristics Required For Flux; Types Of Flux; Piping Materials For Brazing And Used Brazing Filler/Flux - Toshiba RAV-GM561ATP-E Service Manual

2. Characteristics required for flux

• Activated temperature of flux coincides with the
brazing temperature.
• Due to a wide effective temperature range, flux is
hard to carbonize.
• It is easy to remove slag after brazing.
• The corrosive action to the treated metal and
brazing filler is minimum.
• It excels in coating performance and is harmless
to the human body.
As the flux works in a complicated manner as
described above, it is necessary to select an
adequate type of flux according to the type and
shape of treated metal, type of brazing filler
and brazing method, etc.

3. Types of flux

• Noncorrosive flux
Generally, it is a compound of borax and boric
acid.
It is effective in case where the brazing
temperature is higher than 800°C.
• Activated flux
Most of fluxes generally used for silver brazing
are this type.
It features an increased oxide film removing
capability due to the addition of compounds such
as potassium fluoride, potassium chloride and
sodium fluoride to the borax-boric acid
compound.
4. Piping materials for brazing and used
brazing filler/flux
Piping material Used brazing filler
Copper - Copper Phosphor copper
Copper - Iron
Iron - Iron
1) Do not enter flux into the refrigeration cycle.
2) When chlorine contained in the flux remains within
the pipe, the lubricating oil deteriorates. Therefore,
use a flux which does not contain chlorine. When
adding water to the flux, use water which does not
3) contain chlorine (e.g. distilled water or ion-
exchange water).
4) Remove the flux after brazing.
Used flux
Do not use
Silver Paste flux
Silver Vapor flux

6-5-3. Brazing

As brazing work requires sophisticated techniques,
experiences based upon a theoretical knowledge, it
must be performed by a person qualified.
In order to prevent the oxide film from occurring in
the pipe interior during brazing, it is effective to
proceed with brazing while letting dry Nitrogen gas
flow.
Never use gas other than Nitrogen gas.
1. Brazing method to prevent oxidation
1) Attach a reducing valve and a flow-meter to the
Nitrogen gas cylinder.
2) Use a copper pipe to direct the piping material,
and attach a flow-meter to the cylinder.
3) Apply a seal onto the clearance between the
piping material and inserted copper pipe for
Nitrogen in order to prevent backflow of the
Nitrogen gas.
4) When the Nitrogen gas is flowing, be sure to
keep the piping end open.
5) Adjust the flow rate of Nitrogen gas so that it is
lower than 0.05 m³/Hr or 0.02 MPa (0.2kgf/cm²)
by means of the reducing valve.
6) After performing the steps above, keep the
Nitrogen gas flowing until the pipe cools down to
a certain extent (temperature at which pipes are
touchable with hands).
7) Remove the flux completely after brazing.
Nitrogen gas
cylinder
Pipe
Fig. 6-5-1 Prevention of oxidation during brazing
- 37 -
FILE NO. SVM-18043
M
Flow meter
Stop valve
From Nitrogen cylinder
Rubber plug
Nitrogen
gas