Dave, The good news is Doug won't be soldering, because his methods are tactless. The bad news is it depends on the following: * a skilled and trained operator * component geometries * land pad relationships * orientation to flow * thermal dynamics of the design * volumetric deposition differences * fixturization, or the lack thereof * reflow profile * common sense It can be successfully done and meet Aerospace requirements. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: Sunday, October 09, 2011 7:33 PM To: [log in to unmask] Subject: [TN] The Use of Tack Soldering Hi folks! I am looking for your opinions and information on tack soldering for holding components in position for wave or selective soldering processes. I know that tack soldering can result in some void and/or insufficient solder joint defects. Does any know of any published studies on tack soldering or have any experiences they can share? If you do use tack soldering, is there any technique or tack configuration that you use that eliminates/reduces defects? TIA Dave Hillman Rockwell Collins [log in to unmask] ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 16.0 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 For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------