Electronics Forum | Wed Oct 19 22:48:18 EDT 2016 | thaneshsivanadian
Hi All, Currently im seeing a cold solder/ poor wetting underneath the BGA Ball as i shown in the attachment. From the attachment you also can see one ball with poor wetting and another ball with a good wetting. When i checked with my re-flow profil
Electronics Forum | Thu May 08 10:16:17 EDT 2003 | davef
Observations are: * Center most lead of the fuse on the top right of the assembly looks like it has excellent solder flow, but this is PTH. From the amount of solder, it must have been wave or hand soldered. * Center most lead of the fuse on the bot
Electronics Forum | Fri Jul 13 12:32:14 EDT 2007 | rgduval
We've experienced this issue with SN100. A couple of things we've tried, all with varying levels of success: 1. Longer pre-heats. We use SN100 in a solder pot, and pre-heat the boards on our wave machine. This did have a positive effect, but I ne
Electronics Forum | Mon Feb 18 02:08:06 EST 2008 | lococost
4 days seems a lot. You could be losing flux activation causing poor wetting on the enig. Check your suppliers data sheets for paste life. If it was contamination on the PCB, you'ld expect other components to solder badly as well. Try using a bra
Electronics Forum | Wed Sep 05 08:10:45 EDT 2007 | davef
Questions are: * Do not judge the quality of a solder connection by the shineyness or color of the solder connection. Do you have smooth and unform flow, no pitting, and good wetting to the lead and the pad? * What is the temperature of the leads of
Electronics Forum | Thu Oct 20 09:58:54 EDT 2016 | davef
You say, "... re-flow profile temperature, the peak temperature of a component was on 253*C." Questions are: * I assume that was the temperature of the component body. What was the temperature of the solder ball? * How does the temperature on the pr
Electronics Forum | Tue Jul 11 12:59:26 EDT 2006 | mattkehoe@sipad.com
We are trying to apply solder to boards with 80 microinches of electro plated hard gold. No components involved, just print 63/37 paste and reflow. The results are very poor on some boards, not so bad on others? Pictures at http://www.sipad.net/thick
Electronics Forum | Fri Dec 16 03:47:46 EST 2005 | gpaelmo
Anyone have problems wave soldering white tin finish? We are an ems and our customer provides us the pcb's. SMT and TH components on the board. SMT is fine but when we wave solder, wetting to top side is very poor (solder only flows half way up). We
Electronics Forum | Mon Dec 01 15:21:08 EST 2003 | davef
Hey, I thought you were in the BIG house on some trumped-up tax rap. We use many RF shields each month. Generally, the shields are not plated and made of alloy 770 (or alloy 752), half hard temper, as the base material. * Alloy 770; 55%Cu, 27%Zn,
Electronics Forum | Mon May 14 14:34:05 EDT 2007 | rgduval
I have to agree with Jax. We've had some successes, and some horrible failures using white-tin. Generally in solderability, and apparently related to the somewhat more rapid deterioration of white-tin finishes. We've run white-tin as an SMT only
