Electronics Forum | Tue Jun 06 14:31:42 EDT 2000 | Jeff Sanchez
I have 25#'s of bismuth in my shop. I wanted to add some to my 63/37 till it was eutectic. This would allow me to lower the waves temp. Can I do this and still meet standards? Also would it make the solder joints to brittle and would discoloration be
Electronics Forum | Thu May 03 18:40:34 EDT 2001 | pzohbon
We produce a board right now with a QFP that has 20 mil pitch and we are seeing problems with the solder deposition. I believe it to be a cleaning issue which we are addressing. Soon we will be pasting for bga's. Is there a problem with using inter
Electronics Forum | Mon May 07 17:59:07 EDT 2001 | davef
One thing I forgot to add about the globs of solder on your bottom side SMT components after wave soldering: The excess solder is likely reducing the reliability of these components, because of the difference in CTE betweeen the ceramic base on the
Electronics Forum | Thu May 17 08:28:14 EDT 2001 | wavemaster
I would have to agree that the leads are probably geting to hot, but there are many factors that could be the root cause. I would suggest doing a experiment with a solder sample and make 2 recipes. One with a relativly cold profile and one with a r
Electronics Forum | Thu May 03 10:38:42 EDT 2001 | davef
You need to have a way to qualify and monotor your process. X-ray and ERSA's fiber optic inspection thingies are two approaches for doing that. There are lots of good x-ray machines out there. Get a transmissive x-ray machine with resolution of 10
Electronics Forum | Fri May 04 08:23:17 EDT 2001 | Dave Brady
No titration is needed for a fluxer that has a closed flux flow system such as a Opti fluxer. The flux is fed from a pressurized vessel directly to the applicator with no evaporation or change in the flux composition. I hope this helps. If you need
Electronics Forum | Fri May 04 08:38:40 EDT 2001 | gsmguru
In a Nut Shell.... Titration is used to maintain the Concentration level (Solids Content) of a liquid flux. Keeping the concentration level constent ensures repeatable fluxer & soldering performance. Specific gravity measurements can be used to do t
Electronics Forum | Fri May 04 18:24:48 EDT 2001 | ashokdha
I am looking for an IPC Standard (s) or other standard (s) for electronics assemblies. The kind of operations involved are riveting, assembly of backpanels and circuit cards into metal shelf, wire wrap , soldering , contact pins , cabling etc.
Electronics Forum | Mon May 14 18:31:20 EDT 2001 | genny
The experiment was to determine insertions from a > gold plated board into a connector. Same > thickness boards (0.062"), with 100 m base > nickel. � 100m gold =_ 500 insertions � 50 m > gold =_ 300 insertions � 30 m gold =_ 50 to 75 > insertio
Electronics Forum | Wed May 30 10:27:52 EDT 2001 | genny
I couldn't find that standard free on the IPC website and was looking for a quicker answer (hang my head in shame...) Sometimes my company's a little frugal, and to get them to buy a standard can be like pulling hen's teeth... I will see what I can
