Table 1b. Brazing Filler Metals, Based on Specifications and Appendix of American Welding Society AWS A5.8–1981 AWS Classification a Nominal Composition, b Percent Temperature, Degrees F Standard Form c Uses Ni Cu Cr B Si Other Solidus Liquidus Brazing Range BNi-1 74 … 14 3.5 4 Fe, 4.5 1790 1900 1950–2200 1, 2, 3, 4, 8
For brazing AISI 300 and 400 series stainless steels, and nickel- and cobalt-base alloys. Particularly suited to vacuum systems and vacuum tube applications because of their very low vapor pressure. The limiting element is chromium in those alloys in which it is employed. Special brazing procedures required with filler metal containing manganese.
BNi-2 BNi-3 BNi-4 BNi-5 BNi-6 BNi-7 BNi-8 BCu-1 BCu-1a BCu-2
82.5 … 7
3
4.5 Fe, 3 4.5 Fe, 1.5
1780 1800 1800 1975 1610 1630 1800 1980 1980 1980 1630 1690 1595 1570 1680 1770
1830 1900 1950 2075 1610 1630 1850 1980 1980 1980 1650 1630 1715 1610 1580 1750 1830 1100 1860 1635 1885 1740 2130 1915 2100
1850–2150 1, 2, 3, 4, 8 1850–2150 1, 2, 3, 4, 8 1850–2150 1, 2, 3, 4, 8 2100–2200 1, 2, 3, 4, 8 1700–1875 1, 2, 3, 4, 8 1700–1900 1, 2, 3, 4, 8 1850–2000 1, 2, 3, 4, 8
91
… … 3
93.5 … … 1.5 3.5 Fe, 1.5
71 89 77
… 19
… 10 …
… … … … P, 11
… 13
… … P, 10
65.5 4.5
… … 7
Mn, 23
… 100 … … … …
2000–2100 2000–2100 2000–2100 1670–1750 1670–1750 1720–1800
1, 2
… 99
… … … Ot, 1
4 6
… 86.5 … … … O, 13.5 … … … Zn, 41
RBCuZn-A … 59 RBCuZn-C … 58 RBCuZn-D 10 BCuZn-E … 50 48 BCuZn-F … 50 BCuZn-G … 70 BCuZn-H … 80
1, 2, 3
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.
… … 0.1 Zn, 40; Fe, 0.7; Mn, 0.3; Sn, 1 1590
2
… … 0.2 Zn, 42 … … … Zn, 50 … … … Zn, 46.5; Sn, 3.5 … … … Zn, 30 … … … Zn, 20
1, 2, 3
1610–1725 1, 2, 3, 4, 5 1580–1700 1, 2, 3, 4, 5 1750–1850 1, 2, 3, 4, 5 1830–1950 1, 2, 3, 4, 5
BMg-1 is used for joining AZ10A, K1A, and M1A magnesium-base metals. 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. Generally used for high temperature properties and compatability with cobalt-base metals.
830
1120–1160 1860–2000 1635–1850 1885–1995 1740–1840 2130–2250 1915–2050
2, 3
BMg-1 BAu-1 BAu-2 BAu-3 BAu-4 BAu-5 BAu-6
… … … … …
d
… 63
… … … Au, 37
1815 1635 1785 1740 1845 2050
1, 2, 4 1, 2, 4 1, 2, 4 1, 2, 4 1, 2, 4 1, 2, 4
… 20.5 … … … Au, 79.5 62.5 … … … Au, 34.5 18.5 … … … … Au, 81.5 3
36 22 17
… … … … Au, 30; Pd, 34 2075 … … … … Au, 70; Pd, 8
Cr, 19; W, 4; B, 0.8; C, 0.4; Co, 59
BCo-1
… … … 8
2100–2250 1, 3, 4, 8
a Al, 9; Zn, 2; Mg, 89.
Made with FlippingBook - Share PDF online