Brazing/Soldering Materials and Alloys

Solder Joint Design Calculations

Brazing and Soldering filler materials engineering and chemical composistion, specification and uses. Braze Filler temperature operation range.

AWS
Classification
Nominal Composition [%]
Brazing Range [°F]
Uses
Ag
Cu
Al
Ni
Other
BAlSi-2
-
-
92.5
-
Si, 7.5
1110 - 1150
For joining aluminum alloys and cast alloys. All of these filler metals are suitable for furnace and dip brazing. BAlSi-3 and BAlSi-5 are suitable for torch brazing.
BAlSi-3
-
4
86
-
Si, 10
1060 - 1120
BAlSi-5
-
-
90
-
Si, 10
1090 - 1120
BAlSi-6
-
-
90
-
Si, 7.5
Mg, 2.5
1125 - 1150
Vacuum brazing filler metals. Magnesium is present as an O2 getter.
BAlSi-8
-
-
86.5
-
Si, 12
Mg, 1.5
1080 - 1120
BAlSi-10
-
-
86.5
-
Si, 11
Mg, 2.5
1080 - 1120
BAlSi-11
-
-
88.4
-
Si, 10
Mg, 1.5
Bi, 0.1
1090 - 1120
BCuP-1
-
95
-
-
P, 5
1450 - 1700
For joining copper and its alloys with some limited use on silver, tungsten and molybdenum. Not for use on ferrous or nickel-base alloys. Are used for cupro-nickels but caution should be exercised when nickel content is greater than 30 per cent. Suitable for all brazing processes. Lap joints are recommended but butt joints may be used.
BCuP-3
5
89
-
-
P, 6
1300 - 1500
BCuP-5
15
80
-
-
P, 5
1300 - 1500
BCuP-7
5
88
-
-
P, 6.8
1300 - 1500

 

AWS
Classification
Nominal Composition [%]
Brazing Range [°F]
Uses
Ag
Cu
Zn
Al
Ni
Other
BAg-1
45
15
16
-
-
Cd, 24
1145 - 1400
For joining most ferrous and nonferrous metals except aluminum and magnesium. These filler materials have good brazing properties and are suitable for placement in the joint or for manual feeding into the joint. All methods of heating may be used. Lap joints are generally used; however, butt joints may be used.
BAg-2
35
26
21
-
-
Cd, 18
1295 - 1550
BAg-4
40
30
28
-
2
-
1435 - 1650
BAg-6
50
34
16
-
-
-
1425 - 1600
BAg-8
72
28
-
-
-
-
1435 - 1650
BAg-13
54
40
5
-
1
-
1575 - 1775
BAg-18
60
30
-
-
-
Sn, 10
1325 - 1550
BAg-20
30
38
32
-
-
-
1410 - 1600
BAg-22
49
16
23
-
4.5
Mn, 7.5
1290 - 1525
BAg-24
50
20
28
-
2
-
1305 - 1550
BAg-26
25
38
33
-
2
Mn, 2
1475 - 1600
BAg-28
40
30
28
-
-
Sn, 2
1310 - 1550
AWS
Classification
Nominal Composition [%] Brazing Range [°F] Uses
Ni Cu Cr B Si Other

BCu-1

-

100

-

-

-

-

2000 - 2100

For joining various ferrous and nonferrous metals. They can also be used with various brazing processes. Avoid overheating the Cu-Zn alloys. Lap and butt joints are commonly used.

BCu-2

-

86.5

-

-

-

O, 13.5

2000 - 2100

RBCuZn-A

-

59

-

-

-

Zn, 41

1670 - 1750

RBCuZn-C

-

58

-

-

0.1

Zn, 40
Fe, 0.7
Mn, 0.3
Sn, 1

1670 - 1750

RBCuZn-D

10

48

-

-

0.2

Zn, 42

1720 - 1800

BCuZn-E

-

50

-

-

-

Zn, 50

1610 - 1725

BCuZn-F

-

50

-

-

-

Zn, 46.5
Sn, 3.5

1580 - 1700

BCuZn-G

-

70

-

-

-

Zn, 30

1750 - 1850

BCuZn-H

-

80

-

-

-

Zn, 20

1830 - 1950

BAu-1

-

63

-

-

-

Au, 37

1860 - 2000

For brazing of iron, nickel, and cobalt-base metals where resistance to oxidation or corrosion is required. Low rate of interaction with base metal facilitates use on thin base metals. Used with induction, furnace, or resistance heating in a reducing atmosphere or in a vacuum and with no flux. For other applications, a borax-boric acid flux is used.

BAu-2

-

20.5

-

-

-

Au, 79.5

1635 - 1850

BAu-4

18.5

-

-

-

-

Au, 81.5

1740 - 1840

BAu-6

22

-

-

-

-

Au, 70
Pd, 8

1915 - 2050

BCo-1

17

-

-

-

8

Cr, 19
W, 4
B, 0.8
C, 0.4
Co, 59

2100 - 2250

Generally used for high temperature properties and compatibility with cobalt-base metals.

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