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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
Al
94.75
Si
5.25
Al
575/630
[1]
–
BAlSi-1, AL 101
94.75
5.25
Al
92.5
Si
7.5
Al
575/615
[1]
–
AL 102cu
92.5
7.5
Al
90
Si
10
Al
575/590
[1]
–
BAlSi-5, AL 103
90
10
Al
88
Si
12
Al
575/585
[1]
577/582
[2]
–
BAlSi-4, AL 104, AL 718, L-ALSi12, BrazeTec L88/12. Free-flowing, most fluid of
aluminium filler metals. General purpose filler metal, can be used with brazeable
aluminiums in all types of brazing. For joining aluminium and its alloys. Can be
used for joining aluminium and titanium to dissimilar metals; the risk of galvanic
corrosion then has to be considered. Excellent corrosion resistance when joining
aluminium metals. Grayish-white color. Usable for both flame and furnace brazing.
88
12
Al
86
Si
10
Cu
4
Al
520/585
[1]
–
BAlSi-3, AL 201, AL 716. General purpose filler metal, can be used with brazeable
aluminiums in all types of brazing. For joining aluminium and its alloys. Good
corrosion resistance. Can be used for joining aluminium and titanium to dissimilar
metals; the risk of galvanic corrosion then has to be considered. Tendency to
liquation, has to be heated rapidly through the melting range. Grayish-white color.
4
86
10
Al
88.75
Si
9.75
Mg
1.5
Al
555/590
[1]
–
AL 301. Suitable for vacuum brazing.
88.75
9.75
Mg
1.5
Al
88.65
Si
9.75
Mg
1.5
Bi
0.1
Al
555/590
[1]
–
AL 302. Suitable for vacuum brazing.
88.65
9.75
Mg
1.5
Bi
0.1
Al
76
Cu
4
Zn
10
Si
10
Al
516/560
[3]
–
AL 719. For joining aluminium and its alloys. Can be used for brazing otherwise
unbrazeable aluminiums, e.g. castings. Used with flux. Unsuitable for vacuum
brazing due to high zinc content. Worse corrosion resistance due to higher alloying.
Tendency to liquation, has to be heated rapidly through the melting range. Grayish-
white color.
4
10
76
10
Zn
98
Al
2
382/392
[4]
–
AL 802. General purpose filler metal for aluminium soldering/brazing with a torch.
Grayish-white color.
98
2
Al
73
Cu
20
Si
5
Ni
2
Bi
0.01
Be
0.01
Sr
0.01
Al–
Cu–Si
515/535
[5]
–
For brazing aluminium. Traces of bismuth and beryllium disrupt the surface
aluminium oxide. Strontium refines grain structure of the brazing alloy, improving
ductility and toughness.
20
2
73
5
Bi,Be,Sr
Al
61.3
Cu
22.5
Zn
9.5
Si
4.5
Ni
1.2
Bi
0.01
Be
0.01
Sr
0.01
Al–
Cu–Si
495/505
[5]
–
For brazing aluminium. Traces of bismuth and beryllium disrupt the surface
aluminium oxide. Strontium refines grain structure of the brazing alloy, improving
ductility and toughness.
22.5
9.5
1.2
61.3
4.5
Bi–Be–Sr
Al
71
Cu
20
Si
7
Sn
2
Al–
Cu–Si
505/525
[5]
–
For brazing aluminium.
20
2
71
7
Al
70
Cu
20
Si
7
Sn
2
Mg
1
Al–
Cu–Si
501/522
[5]
–
For brazing aluminium.
20
2
70
7
Mg
1
Zn
85
Al
15
381/452
[6]
–
AL 815. General purpose filler metal for aluminium soldering/brazing with a torch.
Grayish-white color.
85
15
Zn
78
Al
22
426/482
[7]
–
AL 822. High-strength, low-temperature. For aluminium-to-aluminium and
aluminium-to-copper.
78
22
Ag
72
Zn
28
710/730
[8]
–
Ag72Zn. Ammonia-resistant. For joining ferrous and non-ferrous metals (steel,
copper, brass...). Good flow properties. With stainless steel in humid environments
risk of interfacial corrosion. Copper-free, good where copper presence is not
desired and/or in presence of ammonia. (Ammonia in presence of water rapidly
attacks copper-containing alloys.) Intended especially for brazing tubes in
refrigeration systems using ammonia (R717) as refrigerant.
28
72
Ag
85
Mn
15
960/970
[9]
–
Ag85Mn, BAg-23, AG 501, Ag 485, Silver Braze 85. Ammonia-resistant. For
joining ferrous and non-ferrous metals (steel, stainless steel, copper, bronze,
brass...). Very good flow properties. Good for stainless steel in humid or wet
environments as there is no risk of interfacial corrosion. Copper-free, zinc-free.
Good where copper presence is not desired and/or in presence of ammonia.
(Ammonia in presence of water rapidly attacks copper-containing alloys.) Intended
especially for brazing tubes in refrigeration systems using ammonia (R717) as
refrigerant, or for high-temperature brazing of stainless steels.
85
15
Cu
80
Ag
15
P
5
Cu–
Ag–P
643/802
[10]
645/700
[11]
645/800
[12]
–
BCuP-5, CP 102, CP1, Sil-Fos, Silvaloy 15, Matti-phos 15, SILVERPHOS 15.
Ductile, slow-flowing. Gap-filling. Can resist torsional stresses, shock loads, and
flexing. For copper, copper alloys, brass, bronze. Primarily for copper-to-copper.
Can be used also on silver, tungsten and molybdenum. Low vibration resistance.
Light copper color. Used in plumbing. Frequently used for resistance brazing. Used
where ductility is important and low tolerances are not achievable. Ductile copper-
copper joints. Used on electrical assemblies, e.g. motors or contacts. Used in
refrigeration and air conditioning systems, and brass and copper pipe fitting. More
fluid than BCuP-3 due to higher phosphorus content. Mutually soluble with copper
and copper alloys. Strong tendency to liquate. Available also in strip and sheet
form. Recommended joint clearance 0.051–0.127 mm (0.002-0.005").
[12]
Flow
point 705 °C. Maximum service temperature 149 °C (intermittently 204 °C).
80
15
5
Cu
75.75
Ag
18
P
6.25
Cu–
Ag–P
643/668
[13]
–
Silvaloy 18M, SILVERPHOS 18. Close to eutectic, narrow melting range, suitable
for low heating rates, e.g. in furnace brazing. Very fluid, for tight-fitting joints. For
copper, copper alloys, brass, bronze. Can be used also on silver, tungsten and
molybdenum. Due to low melting point suitable for joining copper to brass, as
dezincification of brass is less pronounced. Light copper color. Maximum service
temperature 204 °C (intermittently 260 °C).
75.75
18
6.25
Cu
45.75
Ag
18
Zn
36
Si
0.25
Ag–
Cu–Zn
784/816
[14]
–
Matti-sil 18Si. Cheaper alternative of high-silver alloys. Suitable for automotive
industry for brazing steel components where higher-temperature bronze alloys can
not be used. Gap 0.075–0.2 mm.
45.75
36
18
0.25