Electronics Forum | Tue Apr 12 04:37:52 EDT 2005 | chandran
1.Can anyone explain to me what is the clean and non clean solder? 2.What is the standard solder paste height spec for stencils 4mils,5mils and 6mils? 3.Whatis the meaning for ROHS?
Electronics Forum | Tue Apr 12 08:25:43 EDT 2005 | davef
Q1 Can anyone explain to me what is the clean and non clean solder? A1 The trend away from CFCs has lead many users to evaluate switching to no-clean soldering processes. The term "no-clean" is actually a common misnomer when used to describe a flux
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
Electronics Forum | Fri Apr 04 01:39:21 EDT 2008 | slthomas
All of what Dave says is spot on. I suspect that the most likely corresponding defects on your assemblies would be poor wetting and insufficient solder.
Electronics Forum | Fri Sep 25 16:38:56 EDT 2009 | esoderberg
empf issued an excellent study of calculated solder volume in the 90's. It used lotus 123 but is easily used in excel. I have used it for over 10 years. The only thing wrong is with leadless components. the amount of paste required generally is insuf
Electronics Forum | Thu Apr 26 11:21:26 EDT 2007 | slthomas
Question...when the machine said something was wrong, was it reading something wrong (false failure), or was there a true descrepancy but not one that resulted in a bad connection (bridge or insufficient)? Also, did you perform a DOE on the process
Electronics Forum | Thu Apr 29 17:35:17 EDT 2004 | Shinmoto
Hi there, We place FBGA packages on a lot of our memory modules. Our stencils have .013" square apertures and a .005" foil thickness. We are using a type 4 paste from Senju Comtek. The price difference is not that significant and readily available
Electronics Forum | Fri May 21 15:50:41 EDT 1999 | John Thorup
We are running a number of boards with 8-10 25 mil PQFPs on board. Our process is mature with at least 3 years experiance and statistically few opens on the QFPs. Our beloved purchasing department has chased the almighty $ and changed FAB vendors
Electronics Forum | Wed Feb 20 02:12:44 EST 2019 | prasanth
what's the meaning of print pump head in solder paste printing
Electronics Forum | Fri Mar 29 07:19:32 EDT 2019 | jacoblemaster
I am still in confusion what does it mean? I simply have a heat pump which is the part of the HVAC in my home. It is not used over here I supposed.