Agree, we bought a vapour phase inline machine in order to secure the BGA soldering. Inge -----Ursprungligt meddelande----- Från: TechNet [mailto:[log in to unmask]] För Werner Engelmaier Skickat: den 9 juni 2007 02:07 Till: [log in to unmask] Ämne: Re: [TN] SV: [TN] Z-axis expansion Hi Dave, This amount of rework, particularly at LF-temperatures, is not a good idea as you surmised. That can consume upwards of 30% of the fatigue life of the vias, provided they survive the procedure. If you indeed to 'cold' solder joints—this would mean SJs near the BGA centers, you need to 'up' the soldering profile. Reworking these is quite hard to do, bnecause it is difficult to get sufficient heat under the BGAs—that is the reason why vapor phase soldering is making a come-back. Werner ************************************** See what's free at http://www.aol.com. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------