Usually for enamel stripping/tinning like this a low tin content (40/60, even 30/70) is used, this avoids problems of embrittlement, necking and so on caused by the rapid dissolution of the copper into the tin at the high operating temperatures. Drossing should also be reduced if you use an electronic grade, (low tin alloys are commonly used in non electronic applications). Kind Regards Mike Fenner Applications Engineer, European Operations Indium Corporation T: + 44 1908 580 400 M: + 44 7810 526 317 F: + 44 1908 580 411 E: [log in to unmask] W: www.indium.com Leadfree: www.Pb-Free.com -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Mike DiGiacomo Sent: Wednesday, July 10, 2002 2:51 PM To: [log in to unmask] Subject: Re: [TN] Tinned wire breaking Hi Phil, Having used Litz wire the past 4 years, I completely understand your brittle wire situation. We to used a solder pot to tin the wire. I attribute the brittleness of the wire to the enamel on the individual Litz wire strands. During the tinning, I think the enamel reflows and the strands become a single brittle mass. Maybe you could try using a heat sink around the wire during tinning to stop heat from running to far up the wire causing the embitterment. Hope this helps, Mike Di Giacomo Process Development Engineer microHelix Inc. Portland, Oregon -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Phil Nutting Sent: Wednesday, July 10, 2002 5:37 AM To: [log in to unmask] Subject: [TN] Tinned wire breaking Good morning, In many of our designs we use Litz wire. To make a connection with Litz wire the enamel coating from each strand must be removed. Historically we have used a small solder pot to tin the ends of the Litz wire. Currently we have a situation where these tinned wires (about 20 AWG) are breaking when bent around a turret connection. Initially we thought it was due to the solder pot having been turned up too high, but I just ran some tests with the pot at normal temperatures and the wire is still brittle. (Gee, what is my "standard" temperature.... just measured it at 900°F.... oops, that's a little high). What temperature do you folks run small solder pots at? Should I be in the 700-750°F range? Are there any other thoughts on why the wire is so brittle? Thanks in advance, Phil Nutting ---------------------------------------------------------------------------- ----- 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) 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 ---------------------------------------------------------------------------------