Electronics Forum | Thu Dec 24 04:23:49 EST 2009 | leeg
Has anyone had any experience of using High Melting Point Solder paste in production. We have started to trial some boards using the Solder Paste and are experiencing poor solder joints and solder joints that look grainy.
Electronics Forum | Thu Apr 15 16:07:37 EDT 2004 | barry
Hi there all, we are having problems with 2 qfp devices. grainy poorly reflowed solder joints. One 100 pin .5mm pitch, and one 64 pin .5 mm pitch . Both of these devices have a thermo pad on the back of them (pad area soldered to back of device)which
Electronics Forum | Fri Jan 16 15:07:45 EST 2004 | Phil
I have a connector which has very weak joints. Solder fractures easily. On inspection the solder is very grainy and full of voids. Process is 63/37 no clean. Any thoughts? Phil
Electronics Forum | Fri Jun 25 17:33:17 EDT 2004 | davef
Nonductile fracture!!! Sounds peculiar. In that case, stop wasting you time messing with the thermal recipe. Either your: * Components have poor solderability [test this by dipping the leads of a couple of the SSOP in your solder pot and then asse
Electronics Forum | Fri Jul 06 12:11:34 EDT 2007 | james
We are starting to see issues with using Kester WS R562 with lead free components. The joints look grainy on almost all of the 0402'2 and other small components. Some of the solder does not solder to the terminations. These are hybrid boards which
Electronics Forum | Mon Jul 29 09:27:15 EDT 2013 | charliedci
All of our reflow is with room air, 63/37 and SAC305. I believe nitrogen will get you better looking solder joints (shiny, less grainy under magnification), but per IPC, functionality and strength I don't think there is much difference.
Electronics Forum | Tue Jan 04 15:38:19 EST 2000 | Pat Pepper
Hi everyone: Our company is trying out immersion white tin for fine pitch assembly with what I would call mixed results. Reflow solder looks very good, but wave solder looks somewhat grainy (this may not be a problem in actuality). We had dewettin
Electronics Forum | Fri Jan 14 08:05:23 EST 2000 | Pat Pepper
Hi Dave, Thank you for the response. In answer to your responses I'll use the original numbers of my questions. 1. We would like to turn around our boards fast, but sometimes due to the market conditions we wind up with inventory. After reading
Electronics Forum | Fri May 22 12:42:43 EDT 2015 | deanm
Sr. Tech, you are right in that there is no verification of the profile. We are a Class 3 high mix OEM. We have visual inspection after SMT. We have not seen problems with wetting, grainy solder, cold solder, charred boards, etc. that would indicate
Electronics Forum | Tue Dec 28 10:56:37 EST 1999 | Pat Pepper
Would anyone out there happen to have some experience with wave soldering of white emmersion finish pcb's? Recently, we have done some prototype boards in white tin. The reflow solder joints look very good, but the wave solder joints look grainy. I
