[Robotgroup] advice needed: soldering Piezo disks

[Def Egge]

Has anyone had experience in soldering leads to piezo elements 
(crystal layer with brass backing)?

Soldering a lead to the brass seems pretty straightforward.  Any tips 
on soldering the other lead to the piezo crystal layer itself?  The 
crystal layer appears to be epoxied to the brass backing plate.  How 
likely is that to be damaged?

I have examined pre-soldered piezo elements but I cannot tell what 
preparation was made to the crystal layer before soldering the lead 
to it.

Thanks for any tips y'all might offer.


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All the best....

Mike