Steven. Where I used to work before, there is free standing vacuum soldering machine. I don't know how good these machines are. Ours had constant problems, so we do not use it much. Instead we use the in-line machine, which one has never made us disappointed. You can buy a cheap vacuum assisted VP for small a money: http://compare.ebay.com/like/230498299777?ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=211505894475&crlp=1_263602_304662&UA=WXI8&GUID=0f0ff6be12e0a04374052305fff2978a&itemid=230498299777&ff4=263602_304662 Inge On 18 February 2011 12:35, Steven Creswick <[log in to unmask]> > Cedric > > wrote:I echo Inge's comments with respect to 'drying' the elements and > George, > Richard and Paul's on the possibilities of volatiles and suggested use of > pre-tinning and minimal flux. Definitely Denny's on wetting to the Ni. > > Since you are seeing lot to lot differences - the first thing I would > attempt is to pre-tin! Answer your Ni wetting question once and for all. > By pre-tinning, you should be able to force it to wett! ... then clean it. > > The channels which Paul mentions DO work, and don't have to be extremely > macroscopic... but you likely can not do that with these parts. > > Somewhat surprised that no one commented on Thorsten's suggestion for > (vacuum) vapor phase reflow. > I my days of making power devices I had the luxury of a vacuum > reflow/brazing system using conduction heating via graphite tooling. You > would be surprised at how much 'gas & crap' [technical terms] you can pull > out of a plated metal under vacuum - to Inge's comment. Having pre-wetted > components and no flux [could purge with a forming gas] and ability to > over-pressurize would result in essentially void free joints. > > I can see that the vapor phase approach could drastically lessen/eliminate > the need for a flux - assuming the surfaces are clean. I realize you don't > have one, but maybe for this project, you could go to someone that does - > depending upon whether this was a one shot deal, or will be a recurring > project/nightmare. > > What I am not familiar with however, is .... is there such a thing as a > vacuum vapor phase?? > How does that work, or was that just a 'typo'? > I would like to learn more about that particular piece of equipment if > there > is such a critter. > > Sincerely, > Steve Creswick > http://www.linkedin.com/in/stevencreswick > > > > > > > ______________________________________________________________________ > 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 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.aspx?Pageid=E-mail-Forums 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 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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------