I am attempting to find some info or a standard that deals specifically with the soldering of purely mechanical parts,  ( a tube used to transfer hydraulic fluids in an electro-mechanical assembly soldered to another transfer tube) , the company thinks that the small amount of acid from the flux core solder is over a period of time weakening the "weld" and resulting in cracks or fractures.  Can anyone help me with this one?   Thanks in advance.

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