Electronics Forum | Mon Oct 27 20:01:00 EDT 2014 | rangarajd
Hello, We are facing solderability issues on a particular lot of board. THe Nickel thickness measured with an XRF is around 400 U inches. Spec calls out for 130 u inches Nickel and 3 - 5 U inches gold over it. Assuming there is no porosity on the g
Electronics Forum | Thu Oct 30 21:55:13 EDT 2014 | davef
Why soldering issues? I'd guess the nickel is corroded. It is very difficult to solder to oxidized nickel. Your SAC305 would get kicked all the way down the conveyor by nickel oxide. A lack of Ni-Sn-IMC formation will confirm this dewetting . What's
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Technical Library | 2014-03-06 19:04:07.0
Over the last few years, there has been an increase in the rate of Head-in-Pillow component soldering defects which interrupts the merger of the BGA/CSP component solder spheres with the molten solder paste during reflow. The issue has occurred across a broad segment of industries including consumer, telecom and military. There are many reasons for this issue such as warpage issues of the component or board, ball co-planarity issues for BGA/CSP components and non-wetting of the component based on contamination or excessive oxidation of the component coating. The issue has been found to occur not only on lead-free soldered assemblies where the increased soldering temperatures may give rise to increase component/board warpage but also on tin-lead soldered assemblies.
PCB Dynamic Coplanarity At Elevated Temperatures PCB Dynamic Coplanarity At Elevated Temperatures iNEMI's SMTAI 2011 presentation by: John Davignon, Ken Chiavone, Jiahui Pan, James Henzi, David Mendez, Ron Kulterman; Intel Corporation
INSERT INTO tracking_express (userid, username, page_id, ts) VALUES ('#Quser_profile.id#', '#Quser_profile.username#', 10, (#ts#)) SMT Express, Volume 2, Issue No. 2 - from SMTnet.com Volume 2, Issue No. 2 Thursday, February 17, 2000
| https://www.eptac.com/are-voids-in-solder-joints-really-an-issue/
? Posted on 5th June, 2012 by Mark Pilkington Recent Articles IoT and the Aerospace Industry – Too Risky? Leaded vs. Lead-Free Solder: Which is Better? The 5 Essential Tools for Soldering The Importance of IPC-A-610 Certification How to Build on Your Career in Soldering Categories Blog Uncategorized Why Get IPC Certified Well
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) to printed circuit boards (PCBs). The aim of the process is to form acceptable solder joints between SMC and PCB. The reflow soldering process normally adopt following steps: 1
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