Electronics Forum | Wed May 24 16:57:23 EDT 2006 | Steve
The temperatures were measured on the board, ~1/2" away from the components in question. Admittedly the profile is on the bottom end of the Alpha recommendations. The profile was set up this way intentionally to avoid heat damage to other components
Electronics Forum | Thu May 25 03:31:17 EDT 2006 | slaine
Hi I manufacture ceramic parts that have a terminations that are palladium/platinum/silver or any combination of the 3. Termination Ink usually consists of 3 main parts the alloy, glass frit and binder. Binder is to help bind everything together whi
Electronics Forum | Thu Aug 01 08:58:47 EDT 2002 | Rick Lathrop
Good morning Dave F. I am not going to try to touchup the solder pad until I get surface analysis work done, don't want to ruin the evidence. I am getting XPS work done not XRF, XPS is X-ray Photoelectron Spectroscopy and can see very thin films of o
Electronics Forum | Wed Jul 31 08:23:49 EDT 2002 | mcm4me
221C). 2D vision can very effectively detect % pad coverage, I use it on my DEK and this customer has an MPM which I also believe to be capable. Here is another fact, when the customer uses Brand X solder paste the defects due to what they call pad
Electronics Forum | Tue Jul 30 17:51:18 EDT 2002 | davef
Comments are: * Peak at 245�C for 40 sec seems like a very long time. I�d expect the time at 245�C to be 10 to 15 sec. This long time at peak could dewett the pads. * Really, their 2D vision on the printer can verify solder presence? * A thin coat
Electronics Forum | Tue May 23 21:14:22 EDT 2006 | davef
First, where the temperatures that aare mentioned in the original post measured? Second, it sounds like the PdAg component terminations are not seeing enough heat [your soldering iron touch-up proves this]. Your 232*C peak is the absolute minimum s
Electronics Forum | Tue Mar 10 22:27:14 EST 1998 | DWR
What does the term "poor wetting" mean as a defect code ?
Electronics Forum | Wed Mar 11 10:58:58 EST 1998 | Earl Moon
| | What does the term "poor wetting" mean as a defect code ? "Poor" should mean unacceptable when surface (component or PCB solder termination areas) wetting does not provide acceptable solder joints. Unacceptable wetting of PCB solder termination
Electronics Forum | Fri Sep 17 03:03:29 EDT 2010 | grahamcooper22
Hi Gani, looking at the HASL icture and the poor wetting of the solder over the pads I would imagine that the HASL coating is very thin on the pads and in actual fact isn't 'solder' but is tin /copper intemetallic and this has poor solderability. It
Electronics Forum | Fri Mar 23 03:41:19 EDT 2012 | grahamcooper22
try Almit Sn62 HM1 RMA V14L ....its the best no clean lead paste for wetting...I sell it and it has solved wetting problems many times when users have used other pastes
