Electronics Forum | Wed Oct 02 00:08:39 EDT 2002 | praveen
Hi, We are using chip components with Silver Paladium coating and finding poor wetting. We are using the water wash solder paste with 2Ag and std. reflow profile. Any suggestion how to improve the solder wetting for those components. Thanks,
Electronics Forum | Thu Oct 03 10:02:08 EDT 2002 | davef
Your problem is likely not the Pd-Ag surface layers, but the underlying metal to which you need to wet. Either a base metal is: * Contaminated and poorly wettable. OR * A material [eg, Alloy 42 (check with magnet), Kovar, etc] that is inherently dif
Electronics Forum | Wed Apr 21 21:50:28 EDT 2004 | adam
Hi I recently having problems on the components having non wetting on the flex circuits. The profile that I am using is according to the solder paste suppiler recommended. Can anyone pls. advise? Regards
Electronics Forum | Thu Apr 21 14:16:47 EDT 2005 | sumote
Wet/Dry/Vac is pretty standard. We mostly use Wet/Dry/Dry. Nice to see that I am not the only one still using the 288 machine.
Electronics Forum | Tue May 31 10:58:31 EDT 2005 | davef
There are a host of possibilities. Virtually any fabrication process prior to outer layer manufacturing prior to HAL could contribute to dewetting. That goes all the way to excessive brighteners in the copper plating line. Anything that prevents the
Electronics Forum | Thu Sep 08 08:54:09 EDT 2005 | Slaine
if the problem is wetting change the flux type. have you tried adjusting the temperature of the wave? if your getting 100% wetting id decrease the wave temperature, or try a flux that is less active.
Electronics Forum | Wed Nov 09 09:41:44 EST 2005 | chunks
Wetting with lead free at wave is a bit different. You may need to increase your flux parameter to gain top side wetting. May get rid of the voids too.
Electronics Forum | Thu Dec 01 16:14:45 EST 2005 | chunks
You need to verify if you're getting up to the needed temps. It looks like you're not. I'd say it started to reflow but never reached a long enough time. Nitrogen may help with further wetting.
Electronics Forum | Thu Dec 01 17:24:37 EST 2005 | slthomas
Are you sure you're getting enough paste on the pads? It looks like you may not have enough flux to get the solder to wet properly.
Electronics Forum | Thu Jan 05 06:02:05 EST 2006 | Rob
We use dry for everything. There used be be a corroding problem with the fluid for wet wiping, but I'm sure they must have solved that by now.
