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Silver brazing flies out of gap between copper surface and nickel plated surface

Q. We are doing BAg-8 silver brazing between Pure copper and Nickel plated SS304L, we found Brazing filler metal flown out on the surface during vacuum brazing at 830 °C 40 minutes.
Can you please let me know the reason behind this issue of filler metal flown out of the gap between surfaces to be brazed?
Is there any effect of Nickel plating or brazing parameters?

Arjun Prajapati
Metallurgical Engineer - Surat, India
February 9, 2022

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