Electronics Forum | Sun Sep 07 17:16:57 EDT 2008 | gregoryyork
OK Pizza it is then, here goes. Dewetting of Ni/Au pads, paste favouring the Tinned component lead hence excess paste wicking on top of the components. Reason is EITHER Nickel migration into the gold due to high levels of Ionics from poor rinse OR mo
Electronics Forum | Tue Sep 09 19:35:26 EDT 2008 | vladig
OK. Here it goes. It's a series images taken after cross-sectionning one of the components. I hope that it's obvious now that teh "knob turning" technique wouldn't work that time around :-) I have one more image in my "back pocket", which explains
Electronics Forum | Tue Aug 26 07:44:06 EDT 2008 | davef
Industry-wide, there is no current requirement for baking of bare boards. It adds no value. * IPC-HDBK-001 has guidelines olden times. * IPC-TM-650 has several test methods to determine moisture resistance to both liquid immersion and absorption from
Electronics Forum | Wed Aug 27 09:30:22 EDT 2008 | vladig
Hi Eyal, Sure you can do that. You might be able to use your "typical" reflow profile for eutectic, or tweak it slightly. it's a good idea to do a trial run and then get a couple of components cross-sectioned and checked for the microstructure of th
Electronics Forum | Thu Aug 28 08:31:55 EDT 2008 | grics
Sorry for the confusion... "WML" is a who... Wave Master Larry... He is a person on the forum who has a degree from Soltec? I don't remember... I was hoping he would have left a comment or some info that we could all learn by. (I am not sure how thi
Electronics Forum | Thu Aug 28 12:18:03 EDT 2008 | grics
Why yes, I regognize all the best. WML, I have an idea... I am going to call it, the Dunker. Instead of anyone foaming, I will get the wave operators to throw the boards into a rubbermaid tub full of flux/gasoline mixture and send through to the wav
Electronics Forum | Fri Aug 29 07:55:29 EDT 2008 | realchunks
I agree with Pat. We specify matte finish on all our boards. Once in a while our QC Dept lets in some glossy finishes in and then do their victory dance at the wave chanting "Wut ya gunna do about!?! Wut ya gunna do? Process outta control! Giggi
Electronics Forum | Tue Sep 02 14:59:41 EDT 2008 | hermes
if two boards with different solder masks give different results on flux residue level after soldering with the exact same machine settings than it is clear that one of the solder masks is not compatible with your no-clean flux. could be the solder m
Electronics Forum | Wed Aug 27 18:28:29 EDT 2008 | blnorman
We have an immersion silver board that has a brown discoloration after processing. It's not flux residue, that normally doesn't cause this condition. Elemental analysis shows less than 1% sulfur, and I thought silver sulfide is more a black color.
Electronics Forum | Tue Sep 02 16:07:04 EDT 2008 | blnorman
Colorization is relatively uniform across the board. "Processing" is first pass reflow. I belive MacDermid is the ImmAg supplier. Plating thickness has not been determined, our XRF is being revitalized. Elemental analysis did show a large copper
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