Silver-flo™ Filler Metals
Silver-flo™ products can be used to join the common engineering metals such as copper, copper alloys (brass, bronze, nickel silver, aluminium bronze, copper nickel), nickel alloys, steel, stainless steel and tungsten carbide.
Silver-flo™ 55 and 56 are general-purpose cadmium-free filler metals combining low brazing temperatures with short melting ranges. Both are free flowing, produce neat joints and are easy to use. They are used as replacements for cadmium-containing filler metals. Silver-flo™ 40 is a popular general-purpose product with medium melt and flow characteristics. Silver-flo™ 302 is a higher- and longer-melting filler metal and a useful gap-filling alloy.
Ag
55
Cu
21
Zn
22
Sn
2
ISO 17672
Ag 155
Melting Range
630 - 660°C
Silver-flo™ 55 is an easy to use, general purpose silver brazing filler metal. It has a low brazing temperature, short melting range and is free flowing when molten, producing neat joints with small fillets.
Silver-flo™ 55 is a cadmium-free replacement for the high silver (38-50%) cadmium containing filler metals. It can be used on most common engineering metals.EN1044:1999
AG103
Silver-flo™ 55 is a cadmium-free replacement for the high silver (38-50%) cadmium containing filler metals. It can be used on most common engineering metals.EN1044:1999
AG103
Ag
56
Cu
22
Zn
17
Sn
5
ISO 17672
Ag 156
Melting Range
618 - 652°C
Silver-flo™ 56 has very similar properties to Silver-flo™ 55. It has a low brazing temperature, short melting range and is free flowing when molten, producing neat joints with small fillets. Originally conforming to the US standard AWS A5.8 BAg-7, it can be used as a cadmium-free replacement for the high silver (38-50%) cadmium containing filler metals.
AMS/AWS A5.8
AMS 4763, AWS Bag-7
EN1044:1999
AG102
AMS/AWS A5.8
AMS 4763, AWS Bag-7
EN1044:1999
AG102
Ag
45
Cu
27
Zn
25.5
Sn
2.5
ISO 17672
Ag 145
Melting Range
640 - 680°C
Silver-flo™ 452 is a general purpose filler metal with 45% silver bridging the gap in properties and cost between high silver 55/56% filler metals and the medium silver 38/40% filler metals. It has the lowest silver content to braze PCD segments below 750˚C without degrading the diamond layer. It has good flow properties, but a slightly higher brazing temperature than the high silver content filler metals.
EN1044:1999
AG104
EN1044:1999
AG104
Ag
40
Cu
30
Zn
28
Sn
2
ISO 17672
Ag 140
Melting Range
650 - 710°C
Silver-flo™ 40 offers a good combination of properties. It has a medium brazing temperature, melting range, flow characteristics and silver content. Silver-flo™ 40 is widely used as a general purpose silver brazing filler metal as well as for joining copper and its alloys to steel in HVAC&R applications. AMS/AWS A5.8
BAg-28
EN1044:1999
AG105
BAg-28
EN1044:1999
AG105
Ag
38
Cu
31
Zn
29
Sn
2
ISO 17672
Ag 138
Melting Range
660 - 720°C
Silver-flo™ 38 has similar properties to Silver-flo™ 40. It has a medium brazing temperature, melting range, flow characteristics and silver content. Silver-flo™ 38 is favoured in different global regions to Silver-flo™ 40 where it is also used in general purpose and HVAC&R applications.
Ag
30
Cu
36
Zn
32
Sn
2
ISO 17672
Ag 130
Melting Range
665 - 755°C
Silver-flo™ 302 has a long melting range and poor flow characteristics, which make it an ideal choice for applications where fillet build ups are required or close tolerance joint gaps are not present. It is used for brazing steel, copper and copper alloy tubes and fittings in HVAC&R and automotive applications. It is a popular choice as a flux coated rod for site work.
EN1044:1999
AG107
EN1044:1999
AG107
Ag
25
Cu
40
Zn
33
Sn
2
ISO 17672
Ag 125
Melting Range
680 - 760°C
Silver-flo™ 252 has a long melting range and poor flow characteristics, which make it an ideal choice for applications where fillet build ups are required or close tolerance joint gaps are not present. Like Silver-flo™ 302 it may be used for brazing steel, copper and copper alloy tubes and fittings in HVAC&R and automotive applications.
EN1044:1999
AG108
EN1044:1999
AG108
Ag
60
Cu
26
Zn
14
-
-
Melting Range
695 - 730°C
Silver-flo™ 60 is a filler metal specified for use on copper nickel and nickel alloys (in particular 70:30 copper nickel). It has a brazing temperature above the stress relieving temperature of many of these types of metals thus preventing liquid metal stress cracking as a result of inter-granular penetration. It is resistant to dezincification.
Ag
56
Cu
22
Zn
16.75
Sn
5
Si
0.25
-
-
Melting Range
618 - 652°C
Silver-flo™ 56S is a Johnson Matthey proprietary filler metal which has a small addition of silicon, is very free flowing and produces smooth neat joints with small fillets. It is not recommended on carbon steel components that are subject to high impact or fatigue stress in service.
Ag
45
Cu
25
Zn
26.8
Sn
3
Si
0.2
-
-
Melting Range
640 - 680°C
Silver-flo™ 453S has a small addition of silicon and produces smooth neat joints with small fillets making it popular for hand torch brazing of decorative brass components. Like other high silver content silicon containing filler metals it is not recommended for use on carbon steel components that are subject to high impact or fatigue stress in service.
Ag
44
Cu
30
Zn
26
ISO 17672
Ag 244
Melting Range
675 - 735°C
Silver-flo™ 44 has a medium brazing temperature, melting range, flow and silver content. Although it is not preferred to the more common Silver-flo™ 40 or 38 it has found use in marine applications because it is resistant to dezincification. It is also used as a medium temperature filler metal for copper alloy tubes where joint gaps are variable and a fillet is desirable.
EN1044:1999
AG203
EN1044:1999
AG203
Ag
43
Cu
37
Zn
20
-
-
Melting Range
690 - 775°C
Silver-flo™ 43 has a medium brazing temperature, long melting range, and poor flow characteristics. It is not commonly used but has found use in the shipbuilding industry and in marine applications because it is the lowest silver content filler metal, which is resistant to dezincification. It is a good fillet forming and gap filling filler metal.
Ag
24
Cu
43
Zn
33
-
-
Melting Range
740 - 800°C
Silver-flo™ 24 has been incorporated into aviation / aerospace industry standards and is consequently used in the manufacture of components for applications in this field. It is also used as the first alloy in a two-step silver brazing operation, where the second joint is made with Silver-flo™ 55.
Ag
20
Cu
44
Zn
35.85
Si
0.15
-
-
Melting Range
776 - 815°C
Silver-flo™ 20 is a high melting point silver brazing filler metal that has a comparatively narrow melting range providing reasonable flow properties when molten. It can be used when colour matching to brass is required.
Ag
45
Cu
25
Zn
30
-
-
Melting Range
680 - 700°C
Silver-flo™ 45 is a cadmium free silver brazing alloy originally developed and manufactured to a Johnson Matthey specification. Today this alloy has been largely superseded by Silver-flo™ 452, and is generally only offered where it is included in an old specification.
Silver-flo™ 45 combines a low brazing temperature with a short melting range. It is very free flowing and produces smooth neat joints with small fillets. The alloy is tin and silicon free. The optimum joint gap at brazing temperature is normally 0.05-0.15mm.
Silver-flo™ 45 combines a low brazing temperature with a short melting range. It is very free flowing and produces smooth neat joints with small fillets. The alloy is tin and silicon free. The optimum joint gap at brazing temperature is normally 0.05-0.15mm.
Ag
34
Cu
36
Zn
27.5
Sn
2.5
ISO 17672
Ag 134
Melting Range
630 - 730°C
Silver-flo™ 34 is a cadmium free silver brazing filler metal. It exhibits poor / sluggish flow characteristics melting over a 100°C temperature range. Because of these characteristics Silver-flo™ 34 is not widely used today.
Silver-flo™ 34 has an ability to fill gaps that cannot be tightly controlled and to build fillets. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
EN1044:1999
AG106
Silver-flo™ 34 has an ability to fill gaps that cannot be tightly controlled and to build fillets. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
EN1044:1999
AG106
Ag
33
Cu
33.5
Zn
33.5
-
-
Melting Range
700 - 740°C
Silver-flo™ 33 is a cadmium free silver brazing filler metal. It shows free flowing characteristics melting over a short, but comparatively high, temperature range (700-740°C). It is a good brazing filler metal that has been used as the second filler metal in a three step sequential brazing process along with Silver-flo™ 16 and Silver-flo™ 55.
Silver-flo™ 33 is not widely used today. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
Silver-flo™ 33 is not widely used today. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
Ag
30
Cu
38
Zn
32
ISO 17672
Ag 230
Melting Range
695 - 770°C
Silver-flo™ 30 is a cadmium free silver brazing filler metal that has been adopted for a thermal spray coating process used in the aerospace industry. It is supplied as a wire on plastic reels suitable for feeding into a thermal spray gun.
The filler metal itself has a long and high melting range and poor flow characteristics hence it is not used as a brazing filler metal to any extent. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
EN1044:1999
AG204
The filler metal itself has a long and high melting range and poor flow characteristics hence it is not used as a brazing filler metal to any extent. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
EN1044:1999
AG204
Ag
25
Cu
40
Zn
35
ISO 17672
Ag 225
Melting Range
700 - 790°C
Silver-flo™ 25 is a high melting point cadmium free silver brazing filler metal. It has a high melting temperature(700 to 790°C) with a quoted melting range of 90°C. This melting range suggests medium to sluggish flow properties when molten. The high brazing temperature of the filler metal makes it less easy to use than the high silver content alloys.
Optimum joint gaps at brazing temperature are 0.075-0.2mm.
EN1044:1999
AG205
Optimum joint gaps at brazing temperature are 0.075-0.2mm.
EN1044:1999
AG205
Ag
18
Cu
45.75
Zn
36
Si
0.25
-
-
Melting Range
784 - 816°C
Silver-flo™ 18 is a high melting point cadmium free silver brazing filler metal. It has a high melting temperature(784 to 816°C) but a narrow melting range of only 32°C providing good flow properties when molten. The high brazing temperature of the filler metal makes it less easy to use than the high silver content alloys. Consequently it is not widely used. This product is a relatively inexpensive filler metal to purchase. However the cost per brazed joint of actually using the alloy may not be favourable in comparison to lower melting point, higher silver content filler metals. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
Ag
16
Cu
50
Zn
34
-
-
Melting Range
790 - 830°C
Silver-flo™ 16 is a high melting point cadmium free silver brazing filler metal. It has a high melting temperature(790 to 830°C) but a narrow melting range of only 40°C providing good flow properties when molten.The high brazing temperature of the filler metal makes it less easy to use than the high silver content alloys. Consequently it is not widely used. This product is a relatively inexpensive filler metal to purchase. However the cost per brazed joint of actually using the alloy may not be favourable in comparison to lower melting point, higher silver content filler metals. Optimum joint gaps at brazing temperature are 0.075-0.2mm.
Johnson Matthey & Brandenberger AG - Tel.-Nr. +41 44 307 1930 - Email: gerneral_request@jmmetaljoining.com
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