Same with this one. Ramon > -----Original Message----- > From: Dehoyos, Ramon > Sent: Friday, August 08, 2003 12:49 PM > To: 'TechNet E-Mail Forum.'; [log in to unmask] > Subject: RE: [TN] Wave Solder Preheat > > Al: > The dwell time will be more than 7 seconds. Depending on the type of > machine, it might be more than 10 seconds at that slow speed. > Ramon > > -----Original Message----- > From: [log in to unmask] [SMTP:[log in to unmask]] > Sent: Friday, August 08, 2003 8:47 AM > To: [log in to unmask] > Subject: [TN] Wave Solder Preheat > > Hello Technetters, > > I have a family of boards that to achieve 100% hole fill (I'm building to > IPC-A-610C class 2 - yeah, I know 100% isn't required), I need to preheat > the topside of the board to approximately 310F at about 1.75 ft/min (maybe > a 6-7 second dwell). I usually follow the 180-220F rule-of-thumb, so I'm > asking: What are the potential or real problems? Also, the flux is OA. > > The family of boards are .050-.070" made out of either FR4, GE TEK, or > NELCO 4000-13. They are also waved in a selective soldering pallet with > an > aluminum plate on the topside over 90% of the components to hold them in > place per a design specification. > > Will I damage the board or components (with immediate noticeable failures > or latent field failures)? Or is the 180-220F guideline more from the old > WS6536/Mil-Std-2000 days and todays fluxes, boards, and components can > handle the temperatures? > > Thanks in advance for the help, > > Al Kreplick > Sr. Mfg. Eng. > Teradyne, Inc. > 500 Riverpark Drive > Mail Stop NR500 1-1 > North Reading, MA 01864 > Tel: 978-370-1726 > Fax: 734-661-5352 > Pager: 888-561-6485 > > --------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > 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 1.8e 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 -----------------------------------------------------