Metal de adição para brasagem à base de níquel

The nickel-based brazing alloy BrazeLet BNi1 provides high strength joints with excellent oxidation resistance suitable for brazing stainless steels and nickel-based superalloys. It is suitable for brazing in vacuum or protective atmospheres (dry hydrogen or argon). Joint properties can be further improved by employing a diffusion hold after brazing. The brazing alloy is typically used for joining parts subjected to high stresses and temperatures such as turbine components.

The nickel-based brazing alloy BrazeLet BNi1A provides high strength joints with excellent oxidation resistance suitable for brazing stainless steels and nickel-based superalloys. It is suitable for brazing in vacuum or protective atmospheres (dry hydrogen or argon). The alloy is similar to BrazeLet BNi1, but has low carbon content. Joint properties can be further improved by employing a diffusion hold after brazing. The brazing alloy is typically used for joining parts subjected to high stresses and temperatures such as turbine components and diamond tools.

A liga de brasagem à base de níquel BrazeLet^® BNi2 proporciona alta resistência quando é feita a brasagem de material de aço inoxidável a vácuo ou em atmosfera protetora. A liga de brasagem é tipicamente usada para a brasagem de trocadores de calor, tais como resfrigeradores EGR em aplicações automotivas ou para água encanada de uso doméstico ou industrial, onde não é necessário haver uma alta resistência à corrosão.

O BrazeLet BNi2 contém boro como agente redutor do ponto de fusão e pode, portanto, ser usado em temperaturas relativamente baixas.

Composição

ISO 3677, B-Ni82CrSiBFe-970/1000
ISO 17672, Ni 620
ANSI/AWS A5.8, BNi-2
UNS N99620

Faixa de fusão

970-1000°C

Temperatura mín. de brasagem

1050°C

The nickel-based brazing alloy BrazeLet BNi2 provides high strength when brazing stainless steel material in vacuum or protective atmospheres (hydrogen or argon). It provides excellent high temperature strength and oxidation resistance. Joint properties can be further improved by employing a diffusion hold after brazing. It is a versatile brazing filler metal used in aerospace, automotive and industrial applications such as heat exchangers and turbines.

The brazing paste BrazeLet Ni2DW-9201 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel positions without the need of pre-drying but is easily removed using water. The paste formulation offers the highest metal content of our standard dispensing pastes.

BrazeLet Ni2DW-9201 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. For best performance, it is recommended to first stir the paste.

The nickel-based brazing alloy BrazeLet BNi3 provides high strength joints when brazing in vacuum or protective atmospheres (hydrogen or argon). As it is Cr-free it is less sensitive to marginal furnace atmospheres. The brazing alloy is typically used for brazing nickel-based superalloys and stainless steel components where high elevated temperature strength is important, such as turbine vanes or honeycomb seals. The alloy also has good oxidation resistance. Joint properties can be further improved by employing a diffusion hold after brazing.

The nickel-based brazing alloy BrazeLet BNi4 provides high strength joints when brazing in vacuum or protective atmospheres (hydrogen or argon). As it is Cr-free it is less sensitive to marginal furnace atmospheres. The brazing alloy is typically used for brazing nickel-based superalloys and stainless steel components where high elevated temperature strength is important, such as turbine vanes and honeycomb seals. The alloy also has good oxidation resistance. Joint properties can be further improved by employing a diffusion hold after brazing. Compared to the similar BrazeLet BNi3, BrazeLet BNi4 has better gap filling ability and provides more ductile joints.

O BrazeLet^® BNi5 é uma liga de brasagem à base de níquel com um bom comportamento de molhabilidade sobre materiais de aço inoxidável, em situações de brasagem a vácuo ou em atmosfera protetora. 

O alto teor de cromo na liga resulta em uma boa resistência à corrosão ácida e em gás quente. A elevada faixa de fusão do BrazeLet BNi5 o torna adequado para aplicações sob temperaturas muito elevadas como, por exemplo, em refrigeradores EGR para caminhões e em conversores catalíticos automotivos de metal.

Composição

ISO 3677, B-Ni71CrSi-1080/1135
ISO 17672, Ni 650
ANSI/AWS A5.8, BNi-5
UNS N99650

Faixa de fusão

1080-1135°C

Temperatura mín. de brasagem

1150°C

The nickel-based brazing alloy BrazeLet BNi5 has good wetting behaviour on stainless steels and nickel-based superalloys and is suitable for brazing in vacuum or protective atmospheres (hydrogen or argon). The high level of alloyed chromium results in a good hot gas and acid corrosion resistance. The high melting range of BrazeLet BNi5 makes it suitable for applications working at very high temperatures, for instance EGR coolers for trucks, automotive metal catalytic converters and turbine vanes. It is also a commonly used filler material for industrial heat exchangers. Joint properties can be further improved by employing a diffusion hold after brazing.

The brazing paste BrazeLet Ni5DW-9201 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel positions without the need of pre-drying but is easily removed using water. The paste formulation offers the highest metal content of our standard dispensing pastes.

BrazeLet Ni5DW-9201 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. For best performance, it is recommended to first stir the paste.

The nickel-based brazing alloy BrazeLet BNi6 is a free-flowing material suitable for brazing low-carbon steels and stainless steels. It is suitable for brazing in vacuum or protective atmospheres (dry hydrogen, nitrogen/hydrogen mixtures or argon) and is also suitable for marginal furnace atmospheres. It allows brazing at lower temperatures than any of the other nickel-based brazing alloys. It is particularly suitable for brazing deep narrow joints as it maintains the excellent flowability with limited P diffusion into most base materials. It is recommended that gaps do not exceed 30 µm as wider gaps risk the formation of a crack-sensitive brittle centre line.

O BrazeLet^® BNi7 é uma liga de brasagem à base de níquel que fornece alta resistência ao realizar a brasagem de material em aço inoxidável a vácuo ou em atmosfera protetora. Aplicações típicas para esta liga de brasagem são trocadores de calor que não exigem alta resistência à corrosão, tais como os refrigeradores EGR automotivos, bem como aplicações de água encanada domésticas ou industriais.

O BrazeLet BNi7 contém fósforo como agente redutor do ponto de fusão e pode, portanto, ser usado em temperaturas relativamente baixas.

Composição

ISO 3677, B-Ni76CrP-890
ISO 17672, Ni 710
ANSI/AWS A5.8, BNi-7
UNS N99710

Temperatura de fusão

890°C

Temperatura mín. de brasagem

980°C

The nickel-based brazing alloy BrazeLet BNi7 is a free-flowing material suitable for brazing stainless steels. It is suitable for brazing in vacuum or protective atmospheres (dry hydrogen or argon). It allows brazing at lower temperatures than most of the other nickel-based brazing alloys. It is particularly suitable for brazing deep narrow joints as it maintains the excellent flowability with limited P diffusion into most base materials. It is recommended that gaps do not exceed 30 µm as wider gaps risk the formation of a crack-sensitive brittle centre line. Typical applications for this brazing alloy include thin-walled components such as honeycomb seals, industrial heat exchangers and tubular heating elements for drinking water applications.

The brazing paste BrazeLet Ni7DW-9201 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel positions without the need of pre-drying but is easily removed using water. The paste formulation offers the highest metal content of our standard dispensing pastes.

BrazeLet Ni7DW-9201 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatization as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. For best performance, it is recommended to first stir the paste.

The nickel-based brazing alloy BrazeLet Ni613, features a best in class wetting behaviour on stainless steel material in vacuum or protective atmosphere (dry hydrogen or argon). Its high level of alloyed chromium results in a superior hot gas and acid corrosion resistance. The brazing alloy is best suited for brazing heat exchangers such as exhaust gas recirculation (EGR) coolers in automotive or drinking water applications. Compared to most of the standard nickel-based brazing alloys, BrazeLet Ni613 is able to fill larger gaps without brittle phase lines or cracks. The resulting micro hardness in the brazed joint microstructure is less than half when compared to BrazeLet BNi5. This leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet Ni613D-9004 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel and vertical positions without the need of pre-drying but is easily removed using aliphatic solvents.

BrazeLet Ni613D-9004 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. It has no settlements. However, when opening a can from stock it is always recommended to stir the paste.

The nickel-based brazing alloy BrazeLet Ni613, features a best in class wetting behaviour on stainless steel material in vacuum or protective atmosphere (dry hydrogen or argon). Its high level of alloyed chromium results in a superior hot gas and acid corrosion resistance. The brazing alloy is best suited for brazing heat exchangers such as exhaust gas recirculation (EGR) coolers in automotive or drinking water applications. Compared to most of the standard nickel-based brazing alloys, BrazeLet Ni613 is able to fill larger gaps without brittle phase lines or cracks. The resulting micro hardness in the brazed joint microstructure is less than half when compared to BrazeLet BNi5. This leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The water-based brazing paste BrazeLet Ni613DW-9003 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel and vertical positions without the need of pre-drying but is easily removed using water.

BrazeLet Ni613DW-9003 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. For best performance, it is recommended to first stir it.

The nickel-based brazing alloy BrazeLet Ni613, features a best in class wetting behaviour on stainless steel material in vacuum or protective atmosphere (dry hydrogen or argon). Its high level of alloyed chromium results in a superior hot gas and acid corrosion resistance. The brazing alloy is best suited for brazing heat exchangers such as exhaust gas recirculation (EGR) coolers in automotive or drinking water applications. Compared to most of the standard nickel-based brazing alloys, BrazeLet Ni613 is able to fill larger gaps without brittle phase lines or cracks. The resulting micro hardness in the brazed joint microstructure is less than half when compared to BrazeLet BNi5. This leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet Ni613DW-9201 can be used for dispensing applications, typically found on heat exchanger inlet and outlet tubes, housing to core joints and hole plate to tube joints. It can be dispensed by using standard air pressure dispensing units. For better precision, screw dispense units are recommended. The paste sticks on all bevel positions without the need of pre-drying but is easily removed using water. The paste formulation offers the highest metal content of our standard dispensing pastes.

BrazeLet Ni613DW-9201 properties allow reliable application in a wide speed range as a result of the dispensing equipment / automatisation as well as the needle diameter. The paste can be delivered in cartridges for use in automated applications or different sized cans for refilling of smaller cartridges for manual applications. For best performance, it is recommended to first stir the paste.

The nickel-based brazing alloy BrazeLet Ni613, features a best in class wetting behaviour on stainless steel material in vacuum or protective atmosphere (dry hydrogen or argon). Its high level of alloyed chromium results in a superior hot gas and acid corrosion resistance. The brazing alloy is best suited for brazing heat exchangers such as exhaust gas recirculation (EGR) coolers in automotive or drinking water applications. Compared to most of the standard nickel-based brazing alloys, BrazeLet Ni613 is able to fill larger gaps without brittle phase lines or cracks. The resulting micro hardness in the brazed joint microstructure is less than half when compared to BrazeLet BNi5. This leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet Ni613P-9012 is typically in use for printing thick paste layers of about 0.2 to 0.6 mm on flat parts or on top of structured parts by use of screens or stencils. A typical application is printing of paste on hole plates of tube bundled heat exchangers. The use of rubber squeegees is recommended. Reliable printing requires precise positioning fixture tool by use of vacuum table or clamping device. Typical printing speed is 100 mm/s. Thin printing lines should at least have a width twice the printing thickness and the small dots diameter should be three times the printing thickness or greater. Printing accuracy is very precise as the paste maintains its shape during drying.
 
The solvent based BrazeLet Ni613P-9012 increases productivity wherever drying of the paste is an issue. It has no settlement, and no stirring is needed in the equipment. However, when opening a can from stock it is always recommended to stir the paste. The printed parts can be dried with standard drying process (hot air) at 120 – 170 °C. Here, the drying time needs to be established as it varies depending on thermal mass, parts design and the used furnace. After drying, the paste has excellent adhesion to the metal sheet.

The nickel-based brazing alloy BrazeLet Ni613, features a best in class wetting behaviour on stainless steel material in vacuum or protective atmosphere (dry hydrogen or argon). Its high level of alloyed chromium results in a superior hot gas and acid corrosion resistance. The brazing alloy is best suited for brazing heat exchangers such as exhaust gas recirculation (EGR) coolers in automotive or drinking water applications. Compared to most of the standard nickel-based brazing alloys, BrazeLet Ni613 is able to fill larger gaps without brittle phase lines or cracks. The resulting micro hardness in the brazed joint microstructure is less than half when compared to BrazeLet BNi5. This leads to a more reliable and safe brazing as well as more flexibility in part tolerances.

The brazing paste BrazeLet Ni613R-9003 can be used for roller coating fins or structured plates, typically found in flat heat exchanger designs. Depending on type of roller used the paste can be applied with thin layers either on top or on the side of the fin tips. Gap size between the paste roll and the scraper of 0.08 – 0.12 mm is recommended. The amount of paste is controlled by weight and is a function of the fins or structured plate design. BrazeLet Ni613R-9003 properties allow reliable application in a wide range of coating speeds, tested with good results from 3 m/min up to 20 m/min. The oil-based paste ensures reliable coating over time without drying on the roll. BrazeLet Ni613R-9003 has higher metal content and lower binder content compared to standard roller coating pastes, which decreases packaging and transportation needs for the same amount of brazing filler metal.

The coated fins can be dried with standard drying process (hot air) at 120 – 170 °C. The drying time depends on thermal mass, parts design and the used furnace and thus needs to be established. When dried, the paste has excellent adhesion to the metal sheet.

Höganäs’ unique and patented nickel-based brazing alloy BrazeLet Ni623 is a high temperature brazing alloy suitable to use where both base material and the brazed joints require superior corrosion resistance. The alloy is developed and particularly suitable for brazing high-alloyed austenitic and super-austenitic stainless steels which require special heat treatments and rapid cooling from temperatures around 1100 °C to avoid precipitation of deleterious intermetallic phases.