Electronics Forum | Mon Jun 23 12:50:49 EDT 2003 | russ
There are coatings available for Stainless that will greatly retard the solder from wetting to/eating the metal. This may be a cheaper route to go than Using all Titanium. The coating is melonite QPQ (quench-polish-quench)I really don't have any mo
Electronics Forum | Wed Jul 02 03:12:31 EDT 2003 | Joanna
We have been having problems with solder paste balls around fine pitch ICs and have decided that cleaning the boards in an ultra sonic cleaner may reomove these solder balls. However we are worried that the ultrasonic cleaning process may damage the
Electronics Forum | Thu Jul 03 15:29:46 EDT 2003 | bpan
Hello Jim, We build boards that have traces under the parts all the time. For the most part, we have no problems but on one product we have an 0805 that bridges 2 traces with a very tight seperation and if any solder smears (under the part)we can and
Electronics Forum | Tue Jul 29 09:28:24 EDT 2003 | russ
Why would you get black pad from rework? I could be wrong but once the pad has accepted solder from the first reflow process wouldn't that eliminate the possibility of a latent finish defect? I am curious. We do perform rework on ENIG all of the tim
Electronics Forum | Tue Aug 05 12:56:54 EDT 2003 | caldon
Hi matt- You describe the board but did not indicate the components being inserted (even there is a part being inserted). Assuming your hole dimensions are ok... Are you cutting and clinching the parts? If so what is you clinch angle? We to have mu
Electronics Forum | Tue Aug 05 17:19:55 EDT 2003 | csimfgeng
Another variable is whether the ground pads have proper thermal reliefs. If the pad has solid ground plane around the perimeter, the heat being applied will quickly dissipate to the surrounding metal. A proper relief of the pad will prevent the hea
Electronics Forum | Wed Aug 06 16:35:31 EDT 2003 | Carol
This is an old topic, but keeps coming up. Solderability and reliability issues with SMT gold plated terminations when used with tin/lead solder paste/hassle finish PWB. I need to know which standard (mil, IPC, J-STD??) tells you all about the probl
Electronics Forum | Thu Aug 07 15:41:12 EDT 2003 | gdstanton
To further clarify my question. I'm dealing with mixed solder technologies on a single assembly and am curious how the rest of you guys handle this. Do you use lead based reflow profiles or revert to lead free based profiles? If you haven't seen t
Electronics Forum | Mon Aug 11 15:57:18 EDT 2003 | Fred Matthews
As the traqnsistion to Pb free manufacturing gains speed and exposure the period between true Pb free solutions and the present is still somewhat distant. Are there any publications or documentation on the use of Pb free components and non-Pb free
Electronics Forum | Thu Aug 14 09:34:46 EDT 2003 | davef
We can solder and clean lead-free in well-controlled and stable processes. We have no reason to believe that products made with lead-free will be reliabile. We know that lead-free soldering is worse for the environment than other less costly proces
