Table 1a. Brazing Filler Metals, Based on Specifications and Appendix of American Welding Society AWS A5.8–1981 AWS Classifica tion a Nominal Composition, b Percent Temperature, Degrees F Standard Form c Uses Ag Cu Zn Al Ni Other Soli dus Liq uidus Brazing Range BAlSi-2 … … … 92.5 … Si, 7.5 1070 1135 1110–1150 7
For joining the following aluminum alloys: 1060, EC, 1100, 3003, 3004, 5005, 5050, 6053, 6061, 6062, 6063, 6951 and cast alloys A612 and C612. All of these filler metals are suitable for furnace and dip brazing. BAlSi-3, -4 and -5 are suitable for torch brazing. Used with lap and tee joints rather than butt joints. Joint clearances run from .006 to .025 inch.
BAlSi-3 … 4 … 86 … Si, 10 BAlSi-4 … … … 88 … Si, 12 BAlSi-5 … … … 90 … Si, 10
970 1085 1160–1120 2, 3, 5 1070 1080 1080–1120 2, 3, 4, 5
1070 1095 1090–1120 7 BAlSi-6 … … … 90 … Si, 7.5; Mg. 2.5 1038 1125 1110–1150 7
BAlSi-7 … … … 88.5 … Si, 10; Mg, 1.5 BAlSi-8 … … … 86.5 … Si, 12; Mg, 1.5 BAlSi-9 … … … 87 … Si, 12; Mg, 0.3 BAlSi-10 … … … 86.5 … Si, 11; Mg, 2.5 BCuP-2 … 93 … … … P, 7 BCuP-3 5 89 … … … P, 6 BCuP-4 6 87 … … … P, 7 BCuP-5 15 80 … … … P, 5 BCuP-6 2 91 … … … P, 7 BCuP-7 5 88 … … … P, 6.8 BAg-1 45 15 16 … … Cd, 24 BAg-1a 50 15.5 16.5 … … Cd, 18 BAg-2 35 26 21 … … Cd, 18
1038 1105 1090–1120
7
1038 1075 1080–1120
2, 7
BAlSi-6 through -11 are vacuum brazing filler metals. Magnesium is present as an O 2 getter. When used in vacuum, solidus & liquidus temperatures are different from those shown.
1044 1080 1080–1120
7
1038 1086 1080–1120 2 BAlSi-11 … … … 88.4 … Si, 10; Mg, 1.5; Bi, 0.1 1038 1105 1090–1120 7 BCuP-1 … 95 … … … P, 5 1310 1695 1450–1700 1
1310 1460 1350–1550 2, 3, 4 1190 1485 1300–1500 2, 3, 4 1190 1335 1300–1450 2, 3, 4 1190 1475 1300–1500 1, 2, 3, 4 1190 1450 1350–1500 2, 3, 4 1190 1420 1300–1500 2, 3, 4 1125 1145 1145–1400 1, 2, 4 1160 1175 1175–1400 1, 2, 4 1125 1295 1295–1550 1, 2, 4, 7
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 percent. Suitable for all brazing processes. Lap joints recommended but butt joints may be used. Clearances used range from .001 to .005 inch. For joining most ferrous and nonferrous metals except aluminum and magnesium. These filler metals have good brazing properties and are suitable for preplacement 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. Joint clearances of .002 to .005 inch are recommended. Flux is generally required.
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