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Composition by weight %
Family
Solidus/liquidus
point (°C)
Toxic
Comments
Cu
Zn
Ag
Au
Pd
Pt
Ti
Cr
Mo
W
Mn
Fe
Co
Ni
Cd
Sn
Al
B
Si
P
other
Ag
92.5
Cu
7.3
Li
0.2
Ag–
Cu–Li
760/890
[46]
–
BAg-19, Lithobraze 925, Silver Braze 92.5. Good for precipitation-hardened steel.
Often used for joining skins to honeycomb cores of airframe structures made of
precipitation-hardened steels. For general purpose fluxless furnace brazing of
stainless steels. Not suitable for torch brazing. Requires hydrogen or inert
atmosphere, most often argon. Silver-white color.
[51]
7.3
92.5
Li
0.3
Ag
63
Cu
28.5
Sn
6
Ni
2.5
Ag–Cu
690/800
[41]
691/802
[52]
–
BAg-21, AMS 4774, Braze 630, Nicusiltin 6, Silver Braze 63. For 400-series
stainless steels. Resistant to chloride corrosion and dezincification; withstands
chlorine solutions, salt sprays, etc. Very sluggish, can bridge wide gaps. Tends to
liquate. Combined brazing/heat treatment at above 925 °C improves fluidity of the
alloy. Can be used in protective atmosphere (e.g. hydrogen-nitrogen) or in vacuum
for fluxless brazing. Used in food handling and surgical equipment. Used in joints
requiring higher corrosion resistance than alternative alloys offer. Used in vacuum
applications. White color. High strength, low vapor pressure.
28.5
63
2.5
6
Ag
71.15
Cu
28.1
Ni
0.75
Ag–Cu
780/795
–
Nicusil 3. Better strength and wetting than BAg-8.
28.1
71.15
0.75
Ag
75
Cu
22
Zn
3
Ag–
Cu–Zn
740/790
[46]
–
Braze 750. For silverware. For step brazing. For enameling; low zinc content
causes very little change in brilliance of the enamel. Corrosion-resistant. Remelt
temperature altered by dissolving base metal; increased by silver, decreased by
copper. For iron or nickel alloys. Silver-white color; used in silversmithing due to
color match. Low zinc content minimizes zinc evaporation, especially in controlled
atmospheres during fluxless brazing.
22
3
75
Ag
50
Cu
34
Zn
16
Ag–
Cu–Zn
675/775
[41]
677/774
[53]
–
BAg-6, Braze 501, Braze 502, Braze 503, Silvaloy A50, Silver Braze 50. For
steam turbine blades. For thickly galvanized steel, aluminium and brass tubing.
Widely used in electrical industry. Used in dairy industry. Broad melting range, can
form fillets and bridge large gaps.
34
16
50
Ag
50
Cu
17
Zn
33
Ag–
Cu–Zn
780/870
[41]
–
BAg-6b, BVAg-6b, Braze 502, Braze 503 (VTG grade for vacuum systems, with
reduced volatile impurities). For nonferrous alloys. High electrical and thermal
conductivity. Higher gap-filling capability than corresponding BAg-8. (DUBIOUS,
see the other BAg-6b entry)
17
33
50
Ag
50
Cu
50
Ag–Cu
779/870
[54]
–
BVAg-6b, Braze 503. Vacuum-grade. For electronics where cadmium and zinc
have to be avoided.
50
50
Ag
61.5
Cu
24
In
14.5
Ag–Cu
625/705
[46]
–
BAg-29, BVAg-29, Premabraze 616, Incusil 15. Vacuum grade. For ferrous and
nonferrous alloys in moderate temperature vacuum systems. Slightly sluggish.
Tends to liquate. Can be used without flux in hydrogen, inert gas, or vacuum.
Indium improves wetting of ferrous alloys. Silver-white color. Lowest melting point
from ductile low-vapor pressure alloys.
24
61.5
In
14.5
Ag
63
Cu
27
In
10
Ag–Cu
685/730
[54]
–
Premabraze 631, Incusil 10. Low vapor pressure. For ferrous and nonferrous
alloys.
27
63
In
10
Ag
65
Cu
20
Zn
15
Ag–
Cu–Zn
850/900
[1]
–
PD 103.
20
15
65
Ag
55
Cu
21
Zn
22
Sn
2
Ag–
Cu–Zn
630/660
[1]
–
AG 103, L-Ag55Sn, BrazeTec 5507. For brazing steels, copper and its alloys,
nickel and its alloys. Good alternative to cadmium-containing brazes. Good
wicking. Can be used for induction brazing and flame brazing. Used in
electrotechnics, automotive industry and in toolmaking.
[48]
21
22
55
2
Ag
45
Cu
27.75
Zn
25
Sn
2.25
Ag–
Cu–Zn
640/680
[1][11]
–
AG 104, L-Ag45Sn, Ag 2, BrazeTec 4576. Low-temperature, free-flowing. Used in
plumbing. For brazing steels, copper and its alloys, nickel and its alloys. Good
alternative to cadmium-containing brazes. Good wicking. Can be used for induction
brazing and flame brazing. Used in construction industry, electrotechnics and
automotive industry.
[48]
27.75
25
45
2.25
Ag
45
Cu
27
Zn
25
Sn
3
Ag–
Cu–Zn
640/680
[41]
646/677
[55]
–
BAg-36, Braze 452, Silvaloy A45T, Matti-sil 453, Silver Braze 45T. Low-
temperature, free-flowing. General-purpose. Good substitute of cadmium-
containing alloys. Narrow melt range, suitable for manual or machine feeding to the
joint. Good for narrow gaps. Gap 0.025–0.15 mm. Pale yellow color. Similar to AG
104. Maximum service temperature 204 °C, intermittently 316 °C. For improved
corrosion resistance on stainless steel, use a nickel-containing alloy instead, e.g.
BAg-24.
27
25
45
3
Ag
45
Cu
25
Zn
26.8
Sn
3
Si
0.2
Ag–
Cu–Zn
643/671
[56]
–
Matti-sil 453S. Similar to BAg-36, addition of silicon promotes flow and produces
smoother fillets.
25
26.8
45
3
0.2
Ag
40
Cu
30
Zn
28
Ni
2
Ag–
Cu–Zn
660/780
[37]
–
BAg-4, Braze 403, Argo-braze 40N, Silver Braze 40Ni2. Slow flow. For tungsten
carbides. For stainless steel food handling equipment. Economical alloy for brazing
tungsten carbide tool tips to stainless steels. For brazing stainless steel, mild steel,
cast iron, malleable iron, and many nonferrous alloys. Particularly good for
stainless steel containers and equipment for food handling. Tends to liquate. Gap
0.1–0.25 mm. Light yellow color.
30
28
40
2
Ag
40
Cu
30
Zn
25
Ni
5
Ag–
Cu–Zn
660/860
[37]
–
Braze 404. For tungsten carbides. For stainless steel.
30
25
40
5
Ag
40
Cu
30
Zn
28
Sn
2
Ag–
Cu–Zn
650/710
[1][11][37][57]
–
BAg-28, AG 105, L-Ag40Sn, Ag 3, Braze 402, Silvaloy A40T, Matti-sil 40Sn,
BrazeTec 4076, Silver Braze 40Sn2. Free-flowing. Gap-filling. Often chosen for its
low temperature, good wetting and good flow. Suitable for torch brazing with
manual feed, where heating may be inconsistent. For steel, copper and copper
alloys, nickel and nickel alloys; for joining ferrous, nonferrous and dissimilar alloys
with narrow tolerances. General-purpose, often used in refrigeration work. Used in
plumbing. Best suited for narrow-gap joints. Maximum service temperature 204 °C,
intermittently 316 °C. Gap 0.075–0.2 mm. Pale yellow color. Good alternative to
cadmium-containing brazes. Good wicking. Can be used for induction brazing and
flame brazing. Used in construction industry, electrotechnics and automotive
industry.
[48]
30
28
40
2