[Robotgroup] advice needed: soldering Piezo disks

[Def Egge]

At 18:41  2007-11-17, you wrote:
-=-=-=-=-= begin quoted message =-=-=-=-=-

 >Another way to connect things for example when trying to solder to
 >batteries
 >etc. is to weld the connections. You build a high voltage source 
and
 >then
 >discharge it across the leads. I have used it for battery 
connections
 >
 >before, kinda cool. For example, here's a company that makes little 

 >hobby
 >welders. But, a good technique to use when you just cant solder
 >something.
 >
 >http://www.hobbyspotwelders.com/HSBATTERYPEN.php
 >
 >http://www.hobbyspotwelders.com/basics.php
 >
 >This wouldn't work in your case unless you wanted to weld the brass 

 >parts,
 >but its definitely worth storing in your mental ram for a rainy 
day.
 >
 >Andre'
 >
 >----- Original Message -----
 >From: "Def Egge" <robodigest at innervate.com>
 >To: "The Robot Group Mailing List" <robotgroup at puremagic.com>
 >Sent: Saturday, November 17, 2007 1:30 PM
 >Subject: Re: [Robotgroup] advice needed: soldering Piezo disks
 >
 >
 >At 00:05  2007-11-17, you wrote:
 >-=-=-=-=-= begin quoted message =-=-=-=-=-
 >
 > >Hmmm, in general, you want to do it quickly and get the solder
 >to >flow fast, so tin the lead itself, put some flux on the surface
 >and >then wet the solder tip with solder and then solder it down
 >dead >center. That usually works pretty well.
 > >
 > >Andre'
 > >
 > >----- Original Message -----
 > >From: "Def Egge" <robodigest at innervate.com>
 > >To: "The Robot Group" <robotgroup at puremagic.com>
 > >Sent: Friday, November 16, 2007 6:43 PM
 > >Subject: [Robotgroup] advice needed: soldering Piezo disks
 > >
 > >
 > >
 > >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.
 > >
 > >
 > >--
 > >
 > >All the best....
 > >
 > >Mike
 > >
 > >_______________________________________________
 > >Robotgroup mailing list
 > >Robotgroup at puremagic.com
 > >http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup
 > >
 > >_______________________________________________
 > >Robotgroup mailing list
 > >Robotgroup at puremagic.com
 > >http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup
 >
 >-=-=-=-=-= end quoted message =-=-=-=-=-
 >
 >Sounds like the advice I got years ago when learning to solder ...
 >work hot, work fast, use flux.
 >
 >Thanks, Andre'!
 >
 >
 >--
 >
 >All the best....
 >
 >Mike
 >
 >_______________________________________________
 >Robotgroup mailing list
 >Robotgroup at puremagic.com
 >http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup
 >
 >_______________________________________________
 >Robotgroup mailing list
 >Robotgroup at puremagic.com
 >http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup

-=-=-=-=-= end quoted message =-=-=-=-=-

Thanks for that tip, too.  I frequently see lithium coin cells with 
spot-welded tabs.  Soldering would be taking a big chance.

Ah, the memories ... spot-welding metal-wire racks and sheet-metal 
panels in a factory ... my first industrial job!

The boss (a$$hole) had a favorite place to stand while he showed 
visitors around or chewed out the employees.  I discovered that, if I 
used an oil can kept hidden under my welder, I could consistently 
shower that distant spot with droplets of molten metal.  ;-)  Nearly 
35 years later, I remember the pleasure felt in irritating that 
cheapskate, dishonest S.o.B. ... and it brings a smile to my face all 
over again.


-- 

All the best....

Mike