Electronics Forum | Mon Mar 19 11:26:21 EST 2001 | Steve
Another issue is that once solder paste has been reflowed, the majority of the flux is gone. If it is reflowed again without solder flux, the risk of introducing oxidation to the component leads is increased, thus creating a weak solder joint.
Electronics Forum | Tue Mar 20 18:51:34 EST 2001 | gburson
Another consideration is that heat damage is accumulative. If you have temperature sensitive components, that third reflow may be bringing them close to their failure point.
Electronics Forum | Mon Mar 19 11:32:06 EST 2001 | Steve
Have you done any analysis on the failed rework? There could be any one of several reasons, i.e. bad alignment, wrong reflow profile, bad pad plating, etc. More information will help us help you.
Electronics Forum | Mon Mar 19 13:42:12 EST 2001 | Stephen Schoppe
Process Sciences, Inc. has had previous success with soldering BGAs of this size on large assemblies. Please let us know if you would like us to provide assistance. Stephen Schoppe 512-259-7070 ph. sms@process-sciences.com
Electronics Forum | Mon Mar 19 10:38:51 EST 2001 | Steve
Does any body know if there are any legitimate health or safety reason's to vent solder fumes, at both reflow and hand soldering work stations? Personally I don't like to have the fumes in my face, but I don't know if it causes a health risk. Thanks
Electronics Forum | Mon Mar 19 22:07:05 EST 2001 | davef
Your carbon filters are getting gummed-up by the smoke component of the fumes. [Your carbon filter is intended to remove the vapor portion of the fumes.] You need a cheap bag filter in front of the carbon filter that you can sacrifice. These fumes
Electronics Forum | Tue Mar 20 02:16:23 EST 2001 | PeteC
Susan, If you are not doing design then your warranty must state that it's only for "workmanship". This excludes failures resulting from design or materials. In the event of an issue concerning product failure in the field have an independant labora
Electronics Forum | Mon Mar 19 21:13:53 EST 2001 | davef
Check http://www.esdjournal.com/techpapr/ryne/esdbags.htm for some answers to your questions. We have found that the costs for testing and keeping track of use cycles make this more trouble than it's worth.
Electronics Forum | Tue Mar 20 13:54:46 EST 2001 | mparker
Although I did directly reply to your request, I have a second thought. What are you doing to prevent the defect? Do you know for sure what the cause may be? Do you need help in finding the answer?
Electronics Forum | Tue Mar 20 05:09:24 EST 2001 | zam_bri
How do we calculate number of board ( WIP ) at every stations for JIT lines. Inputs are welcome.
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