caustic blueing

I

itir_du12

Member
EE Expired
Rating - 100%
2   0   0
in supose theres an issue with caustic blueing an old SxS shotgun, but i am asking this question anyway.
what do you think about that ?
is there really an issue with that blueing process ?
i heard the welds will just melt(dont think its hot enough)
or they migh be attackes by the solution(maybe it could happen)


whats is the exact risk of caustic blueing a gun, either a shotgun or rifle, that have soft welds on it ?

also, whats important with that welding process when comes time to heat threat something ? what is the max acceptable temperature, wich are the legends, what is the truth about that ? ?
 
The only caustic part of hot bluing is the first tank. Cleans the metal. Hot bluing solutions are never hot enough to do anything to a weld. Typical temperature of the caustic solution is 292F(144.44C). Brazing and Silver solder melts at 625 to 875 degrees C. Regular(soft) solder at 200C.
Mind you, an old shotgun's barrels may not be soldered or brazed together at all. A rib, if there is one, may not be metal either.
Whether or not rebluing 'an old SxS shotgun' is advisable depends on how old it is and the make/brand. If it's an antique, doing anything to it will drop its value.
 
If barrels are soft soldered together, some where there is a small area that the hot caustic solution will seep in during the boiling process which is from 285 to 300 degrees usually. This does not melt solder but it does slowly eat the soft solder slowly... and it usually is impossible to neutralize the salts that get in under a rib... so they may keep eating away and seeping out and eventually the barrel may fall apart...

Some take the chance but I won't...
 
You must log in or register to reply here.
Back
Top Bottom