Electronics Forum | Tue Nov 29 12:16:29 EST 2005 | Inds
MKS, You do not need to reach a temp of 245C to form a joint and surely not for 0603s. Since you are using such a high temp your flux is getting dried out.. Also if you are going to reach a peak of 245C on a brd that has Sn/Pb compt and Pb-free.. yo
Electronics Forum | Mon Jun 07 03:03:12 EDT 2004 | Frederic
I have a question about solder paste. When the solder paste lost her tackines (dry out) how can i refresh this solder paste?. Can i add a little flux? or it is ban. I noticed that after reflow solder joints look shiny but i can see some discolour (f
Electronics Forum | Mon Jul 10 09:25:47 EDT 2006 | nodlac
Here is a nugget from the Data Sheet... Wave Soldering: Excess moisture on the PCB during soldering may lead to random solder balling and poor wetting of some solder joints. IT IS IMPORTANT that the flux solvent carrier (water) is fully evaporated a
Electronics Forum | Fri Mar 30 11:05:44 EDT 2007 | realchunks
Hi Chris, A lot of it has to do with your product, t-shooting devices and techs ability. There are ways to determine BGA are at fault. X-Ray is a good way to check for shorts. Insufficients are harder to find. Some people use a dye. They squirt
Electronics Forum | Thu Feb 17 11:38:53 EST 2000 | Steve Thomas
We appear to have solved a major reflow process problem (poor quality joints on a 20 mil QFP100...excessive solder left on the lead leg, not much left for a joint) with a design change to the board. We gave ourselves considerably more room for a hee
Electronics Forum | Thu Feb 17 11:38:53 EST 2000 | Steve Thomas
We appear to have solved a major reflow process problem (poor quality joints on a 20 mil QFP100...excessive solder left on the lead leg, not much left for a joint) with a design change to the board. We gave ourselves considerably more room for a hee
Electronics Forum | Wed Oct 04 10:18:51 EDT 2006 | greg york
Now seen the Blow Holes and shallow inverted and non wetting problem an aweful lot over here. Over came the Blow Holes and shallow inverted joints by washing the bare PCB with hot Saponifier then rinse and dry = problem dissapears. Think most PCB ven
Electronics Forum | Thu May 20 07:52:36 EDT 2010 | rgduval
In general, cleaning with deionized water is acceptable for most component. Open switches and contacts, in general, do not get damaged in this process. A good drying is required, of course, after washing. However, you've described dewetting issues
Electronics Forum | Sun Apr 05 18:59:15 EDT 1998 | Graham Naisbitt
Jaqueline There are so many variables in the electronic assembly manufacturing process involving more than 12 different chemistries, that it is impossible to easily identify and determine the nature and reason of such residues. GEC Hirst Research in
Electronics Forum | Fri Feb 18 11:24:52 EST 2011 | pkannan
The following is my opinion on the Shelf life of the Solder paste. Comments are welcome to support or against it. Solder Paste users often have the issue of Shelf life expiry condition. Companies including big MNCs, order certain quantities, but du
