Aufhauser brazing and welding Alloys

Brazing and Soldering of Stainless Steel Components

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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Brazing and soldering of stainless steel pipes and tubes

Brazed joints made in stainless steel and subsequently exposed to water or water vapor can be prone to interfacial corrosion which causes failure of the joints. Using a special silver brazing filler metal is one solution to avoiding the problems of interfacial corrosion in stainless steel components. Aufhauser recommends that its customers consult our technical department in detail on this subject in order to avoid the problem. Further technical information is available under 'Frequently Asked Questions'.

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 A-56T	56	22	17		5		1145/1205	BAg-7	Request Quote
SilverAlloy Cd-50Ni3	50	15.5	15.5	3		16	1170/1270	BAg-3	Request Quote

Brazing of stainless steel gauze

Brazed stainless steel gauze is used in specialized papermaking applications such as paper that needs to be water-marked. It is also used in chemical plants such as in catalyst catchment gauzes. Joints made in these environments must be resistant to chemical corrosion in their operating environment. Brazed joints made in stainless steel and subsequently exposed to water or water vapor can be prone to interfacial corrosion which causes failure of the joints. Using a special silver brazing filler metal is one solution to avoiding the problems of interfacial corrosion in stainless steel components. Aufhauser recommends that its customers consult our technical department in detail on this subject in order to avoid the problem. Further technical information is available under 'Frequently Asked Questions'. Some suitable brazing filler metals and fluxes are shown here:

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 A-56T	56	22	17		5		1145/1205	BAg-7	Request Quote
SilverAlloy Cd-50Ni3	50	15.5	15.5	3		16	1170/1270	BAg-3	Request Quote