Electronics Forum | Mon Dec 18 11:11:15 EST 2000 | markt
Can you recomend any information sources regarding European and Japanese Lead Free Solder Regulations? Are these pending regulations (WEEE) something that the entire EEC is looking at? As a company that exports to Europe what adjustments can we expec
Electronics Forum | Wed Aug 23 16:57:10 EDT 2000 | Dr. Ning-Cheng Lee
Regarding solder paste printing, many books available on the market all have some sections addressing this topic. Unfortunately, as of today, solder paste printing has not been the main theme of any book yet. I consider the better sources of informat
Electronics Forum | Fri Aug 30 04:53:08 EDT 2002 | jason
Hi Dr Lee, Recently, I was assigned to use Ag imm. PCB using 63/37 solder paste without Ag. The results were not fantastic. Surface finish was rough and lots of wetting issue. The oven profile soaking time was set at 70 secs above 183�C and Max tem
Electronics Forum | Tue Aug 22 09:30:31 EDT 2000 | Kelvin Chow
Mr. Lee, Although most of the lead free alloy used for solder paste and wave soldering have been identified, a suitable alloy used for leaded Ic packages (like QFP, PLCC..etc) have not been identified yet. Do you have any suggestion on this lead-f
Electronics Forum | Thu Jul 20 12:51:50 EDT 2000 | Tekguy2000
We are currently running boards with resistor paks on the solder side of the board introducing these to the wave solder. We cannot get rid of shorting between the leads. We are using a water soluble acohol based flux. The option of going to selective
Electronics Forum | Wed Jun 07 11:25:23 EDT 2000 | Dave F
In the portion of Chapter 1 on Flip Chips, Ken Gallio states (1.8.2.1) "tin/lead solder leaching or dissolving gold and form metal compounds, called dendrites, that greatly reduce joint reliability because of high brittleness." What is the compositi
Electronics Forum | Wed May 09 10:31:35 EDT 2001 | davef
Two things to try, if you don't get direct answers: 1 Use the contact points at http://www.streckfuss.com/wave_soldering.htm 2 Do a net search on "wave solder streckfuss". Call the companies that list Streckfuss wave solder machines in their capab
Electronics Forum | Thu May 24 19:19:20 EDT 2001 | davef
Try: * Poor looking solder connections * Good looking solder connections * Reliable solder connections Look to Ch 5 of "Manufacturing Techniques For Surface Mounted Assemblies"; RJ Klein Wassink & MMF Verguld; Electrochemical Pub; ISBN 0-901150-30-4
Electronics Forum | Wed Jun 13 21:27:41 EDT 2001 | davef
It depends on if [1] your solder connection is properly wetted or not and [2] the connection was sheared properly or not. For a properly wetted connection and properly run shear process, it looks like someone cut the connection with a knife. Consid
Electronics Forum | Mon Jul 16 09:04:00 EDT 2001 | Hussman
No argument here. But I've don't think I've ever seen solder balls on 0402s. Even when they're placed on narrow G dimension pads, where there is little toe fillet, I've never seen a solder ball. But your idea of reversed homeplates would work grea
