For all alloys in this Table: Ni=bal., S=0.02, Al=0.05, Ti=0.05, Zr=0.05
P= 0.02 unless otherwise indicated
(1) - Other: P=10, Mn=0.04
(2) - Other: Mn=23, Cu=4.5
Boron containing BNi-1 to 5 tend to corrode thin sheets.
Boron free filler suitable for nuclear reactors (boron absorbs neutrons).
BNi-5 has the highest melting point.
Additional filler metals based on copper, gold and precious metals, and cobalt are also in use for special applications.
Fluxes are necessary for Brazing-stainless steels in air, by torch or by induction. Manufacturers' recommendations as to their temperature of activity should be followed, depending on the filler metal used.
Specification for Fluxes for Brazing and Braze Welding
American Welding Society, 24-Apr-1992, 23 pages
The protective atmospheres used for Furnace Brazing-stainless steels are, besides vacuum, dry hydrogen and dissociated ammonia. The dew point should be under control and kept low for best results.
Occasionally an inert atmosphere of dry argon can be used if hydrogen is prohibited because of its reactivity to some metals.
The usual quality requirements are applied, depending on the application. Once the Brazing-stainless Procedure Specification has been approved, process control must be applied in all stages of production from preparation to final delivery.
Safety should always be a concern, but especially for the danger of inhalation of zinc and cadmium by operators in torch brazing, and for the danger of explosion if hydrogen atmosphere is used. In this case the furnace must have facilities for suitable management of emergencies like sudden loss of power. Training and refreshing of instructions should be repeated at regular intervals.
Modern Brazing of Stainless Steel
Brazing-stainless steel using Amorphous Brazing Foil
Brazing & Soldering Materials
The European Association for Brazing and Soldering (EABS)
Fundamentals of Brazing [...]
PWL#035B and Bulletin 77.
An Article on New Silver-Free Brazing Filler Metals was published (4) in Issue 140 of Practical Welding Letter for April 2015.
Click on PWL#140 to see it.
An Article on Filler Metal for superconducting radiofrequency cavities was published (4) in Issue 145 of Practical Welding Letter for September 2015.
Click on PWL#145.
An Article on Aim for Small, Concave Braze Fillets was published (3) in Issue 148 of Practical Welding Letter for December 2015.
Click on PWL#148.
An Article on A new method of brazing stainless steel parts was published (7) in Issue 151 of Practical Welding Letter for March 2016.
Click on PWL#151.
Commercial Sources Publications
Hot-Zone Design Meets Tight Brazing Temperature Requirements
High Temperature Brazing Alloys (16 pages)
Frequently Asked Questions
Metal Joining FAQ.
Filler Metal Technical and Safety MSDS Documents
Download your copy of the Brazing Book from
Handy & Harman.
* * *
|Watch the following Video on
Brazing Brass to Stainless at FABTECH 2011 https://www.youtube.com/watch?v=-pbPddrtiTI
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