Panasonic CS-Z20TKR Service Manual page 78

13.7.7 Selection of brazing material
Use BAg brazing material (silver solder) to increase the welding performance.
JIS
Category Standard
Number Ag
49.0
BAg • 1A
51.0
44.0
BAg • 1
56.0
BAg
34.0
BAg • 2
36.0
48.0
BAg • 3
51.0
BCuP-2
—
4.8
BCuP-3
5.2
BCuP
14.5
BCuP-5
15.5
Caution
BCuP (phosphorus copper wax) is easy to react with sulfur, and makes a brittle compound water soluble, and causes
gas leakage. In hot spring areas, use other brazing materials or paint the surface for protection.
13.7.8 Need of flux
Use flux to protect the base materials.
1. Remove impurity and oxide film on the metal base, and improve the flow of the brazing material.
2. Prevent oxidation of the metal surface in brazing.
3. Reduce the surface tension of the brazing material.
13.7.9 Need of nitrogen gas
In order to prevent oxidation in the pipe, perform the brazing operation in nitrogen gas flow.
3
Flow rate 0.05 m / h, or pressure reducing valve at 0.02 MPa (0.2kgf / cm
Composition of ingredients (%)
Cu Zu Cd
14.5 14.5 17.0
~ ~ ~ ~
16.5 18.5 19.0
14.0 14.0 23.0
~ ~ ~ ~
16.0 18.0 25.0
25.0 19.0 17.0
~ ~ ~ ~
27.0 23.0 19.0
14.5 13.5 15.0
~ ~ ~ ~
16.5 17.5 17.0
remain
— —
~ remain — —
~ remain
— —
Temperature (°C)
Ni P Solidus Liquidus
approx. approx.
— —
625 635
approx. approx.
— —
605 620
approx. approx.
— —
605 700
2.5
approx. approx.
~
—
630 690
3.5
6.8
approx. approx.
~
—
710 785
7.5
5.8
approx. approx.
— ~
645 815
6.7
4.8
approx. approx.
~
—
645 800
5.3
2
78
Tensile strength
(Reference)
Brazing Base
2
Kgf•cm
temp material
635
45.5
~ S20C
760
620
~ 45.5 S20C
760
700
~ 45.5 S20C
845
690 35 SS
~ ~ ~
815 70 SUS
690 21
~ ~ Cu
815 24.5
720 21
~ ~ Cu
815 24.5
705 21
~ ~ Cu
815 24.5
) below.
Characteristics
and
applications
Liquidity is good at
low temperature,
it is preferable to
a small junction of
the gap in the
universal form.
It has similar
performance to the
BAg • 1A, and
suitable for every
base material
except the light
weight metal.
It is a brazing
filler metal in
universal form,
suitable for a
slightly larger gap
junction.
It has good
corrosion
resistance in
stainless
steel-based
brazing, suitable for
brazing tungsten
carbide, aluminum
bronze and copper.
Good liquidity,
suitable for brazing
copper tube.
Suitable for brazing
when the joint
spacing is not
constant
When brazing of
copper and copper,
it is used without a
flux, but not
possible for brazing
basic materials