Have you ruled out the possibility of it being outgassing, rather than a
real leak? Have the materials in this location been used with success
before or are the materials new? A couple things to try to help figure
this out is to use a Helium leak detector or even a bakeout (in case the
source is from residue that's outgassing). Good luck.

Regards,

Paul Terranova
Analytical and Environmental Test Services Lab

 Digital Equipment Corporation
 200 Forest Street
 Mail Stop: MRO3-1/D2
 Marlboro,  MA  01752-3085

'    Phone: (508)467-3109
* Fax: (508)467-6796
* Email: [log in to unmask]
WebSite: http://www.digital.com/lab-services

                -----Original Message-----
                From:   Samuel Flores [mailto:[log in to unmask]]
                Sent:   Sunday, May 10, 1998 7:56 PM
                To:     [log in to unmask]
                Subject:        [TN] Leakage paths through soft solder
joints

                Is anyone familiar with gas leakage paths through soft
soldered joints?
                Part of a vacuum electron device which I am working with
has a puzzling
                leak.  It occurrs only when the device is at a temp of
85C or above.  The
                joint is between a cold-rolled steel piece and a
Carpenter-42 piece.  We
                suspect it is either in the solder itself or in the
interface between the
                solder and the cold rolled steel.  Appreciate all input.

                Thanks,

                Sam


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