Electronics Forum | Tue Sep 30 14:06:04 EDT 2008 | realchunks
What pitch? You can go 5 mil or even 6 mil stencils depending on your screen printer. Also what do you consider "less solder"? What defect are you having. Remember on a QFP you use the heel filet to determine proper solder joint - not the toe.
Electronics Forum | Tue Aug 11 19:46:34 EDT 2009 | padawanlinuxero
Guys I have a question since the ever present problem with the crack switch we had to change to a low temp lead free solder paste in these case eutectic 58Bi/42Sn and 57Bi/42Sn/1Ag alloys, now the main question whats diferent between these one and th
Electronics Forum | Thu May 10 16:11:46 EDT 2012 | comatose
I have a rarely used Wenesco that's about 4 years old that I would be willing to get rid of. Its filled with lead free solder. We just bought a full size automatic selective solder machine which arrives next month, so we'll go from using it once in
Electronics Forum | Fri Aug 02 12:12:40 EDT 2013 | simplycomplex85
We have a YesTech YTV 2000. I'm being asked to set up a program to test the destination solder on through hole parts to make sure there is a lead in the hole and there is solder in the hole. If possible I need to test for bridging also. This is being
Electronics Forum | Wed Aug 07 10:40:19 EDT 2013 | simplycomplex85
They're hand placed and hand trimmed so they may be straight, may not be. And the solder (I think because its lead free) is a dull grey color to there is no reflection from any of it. The solder, lead, and board all show as a dark grey color under re
Electronics Forum | Tue Jan 14 13:21:17 EST 2014 | emeto
This is according to Kester What happens if the paste gets too cold? At temperatures below -15oC (5oF), one or more components of the solder paste may crystallize, producing a non-homogeneous appearance to the solder paste. Such non-homogeneity may
Electronics Forum | Mon Jan 30 19:27:50 EST 2017 | jgo
Hi all, I'm wondering how does one decide to use flux dipping or solder printing when it comes to be attaching CSPs onto the board? Solder printing has an advantage in that there will be a higher throughput on the mounter as there is no flux dippin
Electronics Forum | Tue Jul 25 14:30:04 EDT 2017 | emeto
Looks like you have a great wetting of your paste :). Once body has been in contact with molten solder, the package could suffer damages on the body(outside and inside) and on the circuitry inside. It is considered a defect. I have seen that before a
Electronics Forum | Fri Oct 18 00:44:56 EDT 2019 | Aqueous Technologies
I know you mentioned you use a Tech Spray product. We have had success with their "Wondermask" water soluble product. When using a chemical additive (saponifier) in an aqueous cleaning system we have not experienced residues. I hope that helps. https
Electronics Forum | Thu Sep 21 21:00:21 EDT 2000 | Dave F
Well, I'm going to assume you: * Have a nichel barrier between the copper on your board and the gold / solder solution * Use a lead / tin near euthectic solder If so, I pick "C" - It doesn't matter. When concerned about copper tin intermetallics, t
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