Electronics Forum | Sat Aug 11 13:37:02 EDT 2007 | shing
I am a fresh SMT engineer. I am now facing a problems, solder contamination on Golden Finger nearly about 1 year. I don't know what going on. I have checked the cleaningness of stencil, solder paste handling,IR re-flow profile and even PCB surface
Electronics Forum | Tue May 27 11:59:14 EDT 2003 | blnorman
Is anyone aware of any reports, studies, articles on the subject of silicon contamination in SnPb solder joints. We are evaluating repair of conformally coated (silicone) boards. The fear is that we will never totally remove the silicone and once i
Electronics Forum | Thu Sep 21 17:50:43 EDT 2000 | Bill Boles
Does anyone have a quick reminder for a PCB with immersion gold surface finnish going through a reflow profile: Which of the following statements is more correct? A: In order to minimize gold in the intermetallics of the solder joint, the board temp
Electronics Forum | Fri May 17 03:04:15 EDT 2002 | Mike Konrad
This conversation reminds me of the old �How Many Engineers Does It Take To�� joke. We manufacturer the ionic contamination (ROSE, SEC) testers and I am not aware of anyone that performs such exacting surface area calculations. Most people use th
Electronics Forum | Tue May 14 08:04:58 EDT 2002 | robbied
Hi. Does anyone out there know of a way to calculate the surface area of populated PCB's? We build many different types, and until now have been using a water displacement method, which I believe to be fundamentally flawed. Our technique is to drop a
Electronics Forum | Thu Nov 03 07:43:52 EST 2005 | davef
Questions are: * Is the problem 'wire bonds that don't stick' or 'wire bonds that fall or break off later'? * What materials are you working with? * What is your working time after plasma clean? * What does surface analysis tell you about surface con
Electronics Forum | Mon Mar 17 18:37:59 EDT 2008 | aqueous
We manufacture both bulk and localized ionic contamination testers. My answer is from the perspective of the cleanliness testing method. The issue with all bulk ionic contamination testers (Ionagraph, Omegameter, Zero-Ion), is that they test the en
Electronics Forum | Fri Jul 10 07:34:00 EDT 2020 | elijah
From the poor bonding strength of the board, the surface quality problems of the board are divided into: 1. The cleanliness of the board surface; 2. The problem of micro graphite (or surface energy) on the surface. PCB circuit board proofing Youke bo
Electronics Forum | Fri Jul 13 16:45:37 EDT 2007 | losersk8er
The Contamination has proven to be pretty random, lots of stainless steel though in fact two cases in the past two days. As far as I know all machinery is cleaned regularly as well, even the stencil washer itself. The boards we make are 90% (at l
Electronics Forum | Thu Nov 03 12:48:14 EST 2005 | Rosewood
We have some no sticks, but that is actually a good thing because we have NSD. During process control audits we found that pull strengths to the board dropped off. We build a military application that requires higher bond strenghts. Low pull streg
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