Jack,
        We use solder preforms regularly, both in convection reflow and even
more at laser solder for PTH connectors and compliant pins, etc. We use both
Alpha and Indium as sources for preforms. There is info on the Alpha metals
web site. They have a pretty good selection of sizes and will tool for
custom sizes for a tooling fee.

        The preforms work great because you can calculate exactly what your
solder volume needs to be for critical applications and when used with a
precision process like laser soldering you can achieve 100% yields!

        Linda

-----Original Message-----
From: Jack C. Olson [mailto:[log in to unmask]]
Sent: Wednesday, May 22, 2002 11:59 AM
To: [log in to unmask]
Subject: [TN] ASSY: Reflow for Through-Hole Devices


One of my colleagues here is thinking their must be some kind of solder
ring, or collar, or donut shaped thing that you can drop over the leads of
a (bottom mounted) through-hole device, and then when you reflow the board
the donuts melt and form a fillet for the PTH device at the same time.

Does anyone do this?
If this is feasible, where can I find out more (and get a source for the
solder rings)?

Jack

----------------------------------------------------------------------------
-----
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
----------------------------------------------------------------------------
-----

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------