JM Bronze™ filler metals are a range of special products designed for high temperature
brazing of steel and carbide components. The JM Bronze products which contain nickel
and or manganese can show improved wetting on tungsten carbide.
C Bronze™ has good gap-bridging properties (0.025 to 0.75 mm) and offers excellent
resistance to interfacial corrosion when used on ferritic or austenitic stainless steels.
F Bronze™ is used to used to braze rock drills. It shows good wetting, strength and an ability to allow heat treatment of the drill shank during brazing. Induction brazing is used in air with Tenacity™ No. 125 flux.
JM Bronze™ Copper Based Brazing Filler Metals
Tough pitch copper is an effective and inexpensive brazing filler metal for use when brazing all types of steels, as well as tungsten carbide in reducing atmosphere type brazing operations. Copper is very fluid when molten and when brazing carbon steel an interference type joints fit is required. For brazing stainless steel joint gaps in the range 0.025 to 0.076 mm are recommended.
OFHC (oxygen-free high conductivity copper) is used for the vacuum furnace brazing of all types steels, nickel alloys and tungsten carbide. The same joint clearances for steel apply as above. As molten copper under a vacuum of 1 x 10-4 becomes violate a partial pressure vacuum brazing technique is commonly employed to suppress vaporisation.
1081 - 1101°C
B Bronze™ is a copper-nickel brazing filler metal with a controlled addition of boron. It was developed by Johnson Matthey for furnace brazing of stainless steel and mild steel under reducing atmospheres where the joint gaps involved cannot be closely controlled. It demonstrates resistance to interfacial corrosion on ferritic and austenitic stainless steels.
882 - 1027°C
P Bronze™ is a copper-tin bronze alloy used for the brazing of mild steels where the gaps are too large for the use of copper (i.e. over 0.025 mm) or where a lower temperature than the melting temperature of copper is required, for example when brazing copper to steel components.
965 - 995°C
C Bronze™ is a copper-manganese-nickel brazing filler metal. It demonstrates resistance to interfacial corrosion on ferritic and austenitic stainless steels. C BronzeTM is also used for brazing tungsten carbide tools in a reducing atmosphere showing good wetting and producing strong joints.
980 - 1030°C
D Bronze™ is a copper-manganese-cobalt brazing filler metal that was developed for brazing tungsten carbide tipped rock drills. It shows good wetting, joint strength and allows for heat treatment of the drill shank during the brazing cycle. D Bronze™ can be brazed with induction heating equipment.
890 - 930°C
F Bronze™ is used to braze tungsten carbide tips into tools and drills or tungsten carbide segments onto surfaces to improve cutting, impact or wear resistance. It is harder than D Bronze™ and is used where the heat treatment of the steel drill shank is temperature critical. It can be brazed in air with Tenacity™ No.125 Flux.
880 - 920°C
H Bronze™ is a specialised copper-manganese-nickel brazing filler metal. It is designed for use on cemented tungsten carbide components where it has been shown to produce very strong joints. It is suitable for elevated service temperature applications up to 400˚C.
925 - 955°C
J Bronze™ is a copper-manganese-nickel brazing filler metal. It is designed for use on tungsten carbide to steel where it has been shown to produce very strong joints. J Bronze™ is favoured where it's brazing temperature matches the heat treatment temperature of the steel being brazed.