Electronics Forum | Tue May 30 21:06:57 EDT 2000 | Dave F
Thames: Welcome. Consider Rev C. It's current and has "better" descriptions. Consider a course. I believe IPC is doing a tourof A-610 and J-001 classes. Different problems have different root causes. For instance: * Cold solder: Moving the c
Electronics Forum | Thu Apr 27 15:26:02 EDT 2000 | D Scott
Ron, I too use a Nicolet NXR 1400i. By using the rotation fixture and offsetting the board, a good BGA solder joint will appear elongated. If you rotate the board away from you the wetted joint will appear to lighten and become flat (looking at the
Electronics Forum | Wed Aug 23 15:19:11 EDT 2000 | Dr. Ning-Cheng Lee
From solder material point of view, a solder paste with slow coalescence rate, or slow wetting rate, will be most desirable. Processwise, allowing the paste to stay at soaking zone for longer time will dry out the volatiles, and reduce the chance of
Electronics Forum | Wed May 09 15:15:52 EDT 2001 | caldon
Your process needs some refining. How long did it take to wet? How much force did it take to break the surface tension? What type of solder was in the solder pot? What type of flux was used? What was the pot temperature? Did you take a cap and p
Electronics Forum | Tue Jun 26 12:39:08 EDT 2001 | danial
Our mother company shipped to us a lot of old datecode material and upon running them in the line we experienced non-wetting condition, esplly on the 0402 ( not tombstone ) We have run a dip-and-look test but I guess the method is very subjective as
Electronics Forum | Wed Aug 12 07:18:29 EDT 1998 | Earl Moon
| Looking for Suppliers of surface mount wetting balance equipment. I've used Kester's equipment. It conforms to, and performs in accordance with requirements Dave stated. It's expensive stuff ($32K last time I bought one). For this reason, you migh
Electronics Forum | Mon Jul 06 08:36:26 EDT 1998 | Steve Schrader
| What should a good gold joint look like? We've run boards for our customers that look kinda dull but seemed to wet properly and the boards fired up just nicely! Should they look nice and shiny like our HASL boards or is "a shiny joint is a good joi
Electronics Forum | Mon Jul 06 12:05:56 EDT 1998 | Srirama T. Reddy
| | What should a good gold joint look like? We've run boards for our customers that look kinda dull but seemed to wet properly and the boards fired up just nicely! Should they look nice and shiny like our HASL boards or is "a shiny joint is a good j
Electronics Forum | Mon Sep 17 02:56:40 EDT 2001 | mugen
Hi, (me been absent for some time...) Are your brds confirmed HAL over copper? (check out what Dave F mentioned abt possible root causes) or are the brds HAL over nickle? (shd be no problem here, if so?) or are the brds strictly nickle plated pads?
Electronics Forum | Thu Oct 17 21:32:28 EDT 2002 | davef
Please help to clairify the problem. Are we talking: * A pre-reflow [placement] problem? * A post-reflow [solder wetting] problem? Is the wetting issue that you mention related to the board or to the component? Please give us a little more detail
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