You plan to join two copper plates by soldering or brazing B

You plan to join two copper plates by soldering or brazing. Both processes involve heating the metal to a high enough temperature that the filler material melts and is drawn into the joint. The difference is that soldering has an operating temperature below 450C, while brazing is above it. Question: If these plates are cold-worked pure copper, which process should you choose and what temperature range should be used to avoid softening the plates? Explain.

Solution

since the plates are cold worked, the hardness of the plates is very high. the melting point of copper is about 950 c.

since both process cause heating of the plates to a certain level but not upto the melting point both are advisory,

but as we intend not to lose the hardness or avoid softening of the plates, i prefer soldering over brazing.

soldering uses filler material which contains lead. the alloy has melting point approximately,180 c (eutctic) temperature. while brazing uses copper alloy filler metal which has comparable melting tempearture with respect to copper.brazing may involve softening of plates.

hence, i prefer soldering.