Electronics Forum | Tue Nov 05 09:57:45 EST 2013 | cuperpeter
Hello All, We have a problem with dewetting of solder paste. Problem is most visible on the pads without components (see attached pictures) and occurs randomly, 20% of PCB's. Pcb supplier sent us a cross-section of pads with thickness of Cu, Ni and
Electronics Forum | Wed Nov 06 10:03:59 EST 2013 | rgduval
Hi, Peter, I'm not an authority on surface finish thickness, and it's effect on reflowing, so, I can't advise on that front. If the boards are a week old, and ENIG, I would not suspect surface contamination. It's always a consideration, of course,
Industry News | 2018-12-08 03:29:29.0
SMT Dictionary – Surface Mount Technology Acronym and Abbreviation
SMT Express, Volume 2, Issue No. 3 - from SMTnet.com Volume 2, Issue No. 3 Thursday, March 16, 2000 Featured Article Return to Front Page Curtailing Voids in Fine Pitch Ball Grid Array Solder Joints by Gary Morrison and Kevin Lyne
Impact of Reflowing A Pb-free Solder Alloy Using A Tin/Lead Solder Alloy Reflow Profile On Solder Joint Integrity If you don't see images, please visit online version at #Application.SmtNet.baseURL#/express/ The Impact of Reflowing A Pb
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resource-center/solder-selection-guide
C or more above the liquidus. If a solder joint needs to retain physical integrity during a later operation, such as a second reflow process, the peak temperature of the later operation needs to be below the solidus temperature of the alloy
| https://www.eptac.com/blog/are-voids-in-solder-joints-really-an-issue
. The solder joint has to be metallurgically bonded to the basis material, be it either tin, copper, silver, nickel, brass, etc. and we need to create the intermetallic compound, which allows the wetting between tin of the solder alloy and the basis material
