Argo-braze™ Filler Metals

Argo-braze™ 502 Tri-foil is a composite material with the brazing filler metal on either side of a central copper core. Argo-braze™ 502 Tri-foil is ideal for brazing large carbide pieces of more than 20mm in any dimension. Tri-foil is designed to artificially thicken a joint, relieving stress and reducing the incidence of cracking. The absence of manganese in this filler metal gives it a preferable appearance when compared to Argo-braze™ 49 LM and allows the tungsten carbide to float more easily during positioning.

Argo-braze™ 49 LM Tri-foil is a composite material with the brazing filler metal on either side of a central copper core. Argo-braze™ 49 LM Tri-foil is ideal for brazing large carbide pieces of more than 20mm in any dimension. Tri-foil is designed to artificially thicken a joint, relieving stress and reducing the incidence of cracking. The addition of manganese improves wetting on difficult to wet grades of carbide.

Argo-braze™ 40 Tri-foil can be used for the brazing of tungsten carbide provided that the higher liquidus of 780˚C can be tolerated without causing post braze cracking. Argo-braze™ 40 has a longer melting range than Argo-braze™ 502 and Argo-braze™ 49 LM so it is not as free flowing, however, the lower silver content makes it a more economical option.

Argo-braze™ 56 was formulated to overcome potential problems of interfacial corrosion on stainless steel components exposed to wet conditions in service. It contains nickel, which has been found to promote resistance to this type of corrosion whilst excluding zinc, which may promote it. Argo-braze™ 56 contains indium, which reduces the melting temperature making it somewhat easier to use than Argo-braze™ 632. It has a long melting range and poor flow characteristics giving rise to large fillets around the joints.

Argo-braze™ 632 was formulated to overcome potential problems of interfacial corrosion on stainless steel components exposed to wet conditions in service. It contains nickel, which has been found to promote resistance to this type of corrosion whilst excluding zinc, which may promote it. It has a long melting range and poor flow characteristics giving rise to large fillets around the joints. The relatively high brazing temperature and poor flow make it more difficult to use than conventional silver brazing filler metals.
AMS/AWS A5.8
4774, BAg-21

Argo-braze™ 72NiV is a modified version of the silver-copper brazing filler metal Argo-braze™ 72V. It has a nominal 0.5% addition of nickel that improves the filler metal's wetting characteristics on ferrous and nickel based parent metals and somewhat reduces the alloy's flow properties making it more sluggish.

Like Argo-braze™ 72V this filler metal can be manufactured to meet vacuum tube grade requirements with low and controlled levels of volatile impurities. Consequently it can be used on vacuum tube devices that operate at moderate temperatures, and where the presence of volatile elements might otherwise be detrimental to the performance of the component.

Where ceramics are being brazed to a low expansion nickel alloy care should be taken (nickel plating / stress relieving) to prevent inter-granular penetration (liquid metal stress cracking) of the nickel alloy.

Argo-braze™ 72V is a silver-copper brazing filler metal with a eutectic composition, and has a melting point of 778°C unlike most other brazing filler metals that have a melting range.

It is manufactured to meet vacuum tube grade requirements with low and controlled levels of volatile impurities. Consequently it can be used on vacuum tube devices that operate at moderate temperatures and where volatile elements might be detrimental to the performance of the component.

Having a single melting temperature of 778˚C makes the alloy very free flowing and able to penetrate narrow joint gaps. On silver and copper parent materials the flow of the alloy is reduced and the re-melt temperature is increased due to the filler metal taking silver or copper into solution when molten. Exercising careful control of the brazing cycle brazing temperatures and time at temperature can reduce this effect.

Argo-braze™ 72V shows only limited wetting on iron and nickel base metals and on cemented tungsten carbides.

Where ceramics are being brazed to a low expansion nickel alloy, care should be taken (nickel plating / stress relieving) to prevent inter-granular penetration (liquid metal stress cracking) of the nickel alloy.

Argo-braze™ 72V is supplied as standard as EN 1044 vacuum grade V1, but it can also be supplied in the vacuum grade V2, both of which are suitable for vacuum tube applications. The alloy can also be supplied as the non-vacuum tube grade material EN 1044 AG401.

Argo-braze™ 72V was formerly known as Silver-Copper Eutectic™.
AMS/AWS A5.8
BAg-8

EN1044:1999
AG401

Argo-braze™ 63V is a silver-copper-indium brazing filler metal. It is manufactured only as a vacuum tube grade material with low and controlled levels of volatile impurities. The indium content of this filler metal reduces the alloy's melting temperature and gives it improved wetting on ferrous parent metals over the straight silver-copper filler metal Argo-braze™ 72V.

The alloy is intended for use in fluxless atmosphere (reducing or inert gas) or vacuum brazing applications. Argo-braze™ 63V is, however, prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible.

This filler metal is typically used for brazing vacuum tube type components and for the brazing of metallised ceramics in vacuum tube devices or in the production of ceramic to metal seals. Where ceramics are being brazed to a low expansion nickel alloy care should be taken (nickel plating / stress relieving) to prevent inter-granular penetration (liquid metal stress cracking) of the nickel alloy.

Argo-braze™ 63V can be used as the last stage in a multi-step, sequential brazing operation with high melting point filler metals like Argo-braze™ 72V, Pallabraze™ 810 etc.

Formerly this filler metal was called IN10.

Argo-braze™ 61V is a silver-copper-indium brazing filler metal. It is manufactured only as a vacuum tube grade material with low and controlled levels of volatile impurities. The indium content of this filler metal reduces the alloy's melting temperature and gives it improved wetting on ferrous parent metals over the straight silver-copper filler metal Argo-braze™ 72V.

Argo-braze™ 61V is intended for use in fluxless atmosphere (reducing or inert gas) or vacuum brazing applications, however, it is prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible.

This filler metal is typically used for brazing vacuum tube type components and for the brazing of metalised ceramics in vacuum tube devices or in the production of ceramic to metal seals. Where ceramics are being brazed to a low expansion nickel alloy care should be taken (nickel plating / stress relieving) to prevent intergranular penetration (liquid metal stress cracking) of the nickel alloy.

Argo-braze™ 61V can be used as the last stage in a multi-step, sequential brazing operation with high melting point filler metals like Argo-braze™ 72V, Pallabraze™ 810 etc.

This filler metal was formerly called IN15.

Argo-braze™ 60 is a specialised cadmium free and zinc free silver brazing filler metal which makes it suitable for flux-less brazing in reducing or inert gas atmospheres as well as vacuum.

Argo-braze™ 60 is also available as vacuum tube grade material with low and controlled levels of volatile impurities.

Being zinc free the alloy is suitable for the brazing of components in applications where dezincification of zinc containing filler metals might occur, such as exposure to salt water.

The tin content of this filler metal depresses the melting temperature and improves its wetting on ferrous parent metals over the silver-copper filler metal Argo-braze™ 72V. It is, however, prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible.

Joint gaps should be between 0.075mm and 0.2mm at brazing temperature.

This filler metal was formerly called RTSN™.
AMS/AWS A5.8
4773,BAg-18

EN1044:1999
AG402

Argo-braze™ 85 is a highly specialised free flowing silver-manganese brazing filler metal. The product is suitable for brazing joints that will continuously operate at temperatures up to 260°C or in applications involving short time exposure to service temperatures of 425°C.

Being a copper free filler metal it is also suitable for use in applications involving contact with ammonia, such as the brazing of steel pipe joints in refrigeration systems.

It can be used to braze a wide range of materials - carbon steels, stainless steel, nickel alloys, cobalt based hard / wear resistant metals and tungsten carbide. It should be noted that joints produced by the alloy on stainless steel may not be resistant to attack by interfacial corrosion.
AMS/AWS A5.8
4766, BAg-23

EN1044:1999
AG501

Argo-braze™ 562 is a specialised, cadmium free, zinc free silver brazing filler metal. Thus it has been used for furnace brazing operations where the evolution of zinc fume would not be acceptable. Its principle use is for the fluxless brazing of stainless steel in dry, high hydrogen content reducing atmospheres. Joints brazed with Argo-braze™ 562 exhibit good elevated temperature properties up to 425°C.

Argo-braze™ 562 has a long and high melting range and produces large fillets. It is consequently prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible.
AMS/AWS A5.8
4765,BAg-13a

Argo-braze™ 54 is a specialised cadmium free silver brazing filler metal. It is mainly used for brazing austenitic stainless steel joints that will be required to work at elevated temperatures, such as jet engine components.

It can be used to join both ferrous and non-ferrous metals and due to its low zinc content can be used in furnace brazing applications.

It has a long melting range and is useful as a gap-filling alloy producing large fillets. It is, however, prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible.

The long melting range of the filler metal can prove useful when faced with joints having large and variable joint clearances as the very sluggish flow properties of the filler metal facilitate the bridging of the large gaps.

Argo-braze™ 54 will fill joint gaps of between 0.1mm and 0.25mm at brazing temperature.
AMS/AWS A5.8
4772, BAg-13

Argo-braze™ 25DHE is a cadmium free silver brazing filler metal. It has a long melting range and is useful as a gap filling filler metal producing large fillets. It is, however, prone to liquate (separate into low and high melting constituents) if it is heated slowly through its melting range. For this reason rapid heating methods should be employed wherever possible.