Aufhauser brazing and welding Alloys

Transport / Power Generation

FAQ

Ans. The copper phosphorus alloys (with or without silver) are not as versatile as the silver brazing alloys. Copper phosphorus alloys are used primarily in the joining of copper to copper. The phosphorus acts as the flux. Silver brazing alloys can be used not only on the same base materials as the copper phosphorus alloys, but also on many other base materials.

Ans. Copper phosphorus alloys can be used on brass, silver, tungsten and molybdenum. However they are not self-fluxing on these materials.

Ans. The iron and nickel will react with the phosphorous, forming intermetallic brittle phosphide compound, resulting in a weak joint.

Ans. For the more common standard type of joints, a gap of .002-.005 inches is suggested for both silver and copper phosphorus filler metals. We recommend that you contact our technical experts if you have a question regarding a specific application.

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Hydraulic fitting brazing

Hydraulic components can be brazed in air using a silver brazing filler metal and flux or in a controlled atmosphere furnace using a copper based brazing filler metal. Choice of filler metal in each case will depend on the normal brazing parameters such as joint gap for example.

Aufhauser Product name	Nominal Chemical Composition %						Solidus/ Liquidus °F	AWS A5.8
Aufhauser Product name	Ag	Cu	Zn	Ni	Sn	Cd	Solidus/ Liquidus °F	AWS A5.8
SilverAlloy A-40Ni2	40	30	28	2			1240/1435	BAg-4	Request Quote
SilverAlloy A-50Ni2	50	20	28	2			1220/1305	BAg-24	Request Quote
SilverAlloy B-56Ni2	56	42		2			1420/1640	BAg-13a	Request Quote
SilverAlloy Cd-50Ni3	50	15.5	15.5	3		16	1170/1270	BAg-3	Request Quote

Brazing of electric motors for transport

Trains and trams on mass transit railway systems worldwide rely on electric motors. Frequently the electric motors involved are manufactured from copper chrome zirconium end rings and rotor bars. In these cases there is a need to keep the brazing temperature as low as possible in order to avoid softening of the copper alloy. Consequently a high silver, low melting temperature silver brazing filler metal is used. The cadmium-free products are favored for environmental, health and safety reasons.

Aufhauser Product name	Nominal Chemical Composition %						Solidus/ Liquidus °F	AWS A5.8
Aufhauser Product name	Ag	Cu	Zn	Ni	Sn	Cd	Solidus/ Liquidus °F	AWS A5.8
SilverAlloy A-40Ni2	40	30	28	2			1240/1435	BAg-4	Request Quote
SilverAlloy A-50Ni2	50	20	28	2			1220/1305	BAg-24	Request Quote
SilverAlloy B-56Ni2	56	42		2			1420/1640	BAg-13a	Request Quote
SilverAlloy Cd-50Ni3	50	15.5	15.5	3		16	1170/1270	BAg-3	Request Quote