Electronics Forum | Wed May 09 11:25:29 EDT 2001 | medernach
What type of preheaters do you have on you're wave? I have to agree with Dave. Your leads are not cold, they are hotter than the annular ring on the PCB. This would cause the solder to go to the lead only rather than the component and land pad / a
Electronics Forum | Thu Jul 20 13:23:30 EDT 2000 | Ross Clunie
Bob We are just starting to look in to this process and have been told that it can't be done using a stencil to print the solder paste onto the PCB (of course it was by an equipment manufacturer trying to sell a paste dispnecer). Is this a far commen
Electronics Forum | Thu Dec 08 13:17:31 EST 2005 | Amol Kane
during my researches for LF transition, a question being asked is -- why even consider immersion tin if it whiskers. does it really matter?, because during reflow, the Sn dissolves in the SAC solder alloy and does not exist in a "Sn whisker" formabl
Electronics Forum | Mon May 22 03:24:37 EDT 2006 | slaine
Hi below is a link to a database set up that list the properties of all SAC alloys, worth reading. http://www.europeanleadfree.net/POOLED/DOCUMENTS/a178886/ELFNET_COST531_Solder_Alloy_Properties_Database_v1.pdf its from http://www.europeanleadfree.
Electronics Forum | Fri May 26 09:49:34 EDT 2006 | pjc
This question cannot really be answered definitively here. There are unknowns such as your board design and solder land finish. I suggest you conduct a DoE (Design of Experiments) to determine paste print deposition X-Y-Theta tolerance for your appli
Electronics Forum | Tue Nov 02 08:36:51 EDT 2010 | rgduval
Michelle, Our experience with no-clean solder pastes has been that water washing a mis-print is a bad idea. We've found that DI water does not do a sufficient job removing the no-clean paste (the same goes for stencils). Instead, we have washed no
Electronics Forum | Thu Jul 18 13:11:56 EDT 2002 | gdstanton
Steve, We are touching up 6 - 12% of all solder joints processed. We consider the solder joint to be the focal point of the SMT process. Therefore our metric is based on it. For example in a given month we... 1. Assembled 25pcs of 'A' (IPC-A-610/J
Electronics Forum | Thu Jun 14 08:49:24 EDT 2001 | anders
We have to perform a wire modification on a PCB. I am looking for a wire where the insulationmaterial does not shrink or melt when soldered.
Electronics Forum | Thu Aug 03 10:46:16 EDT 2006 | John S.
We've had a customer request that we check the PPM level of oxygen at our wave solder's inerters. I'm looking on the web, and there seems to be a huge variety of these instruments. Can anyone make a recommendation on one that is working for you? T
Electronics Forum | Wed May 30 10:09:39 EDT 2012 | brettrenishaw
Recently we have noticed a purple-blue colour film on the surface of the molten solder. It can be cleared when de-drossing the pot. The pot will normally go a yellow/gold colour before it turns purple-blue. Is this most likely an oxide of the tin or
