Electronics Forum | Mon Sep 18 11:29:21 EDT 2000 | aflewelling
Why would I want to use photonic soldering for my rework applications?
Electronics Forum | Mon Sep 18 17:55:55 EDT 2000 | Dave F
Reworking BGA with hot air systems (ie, AirVac, SRT) is fairly complicated and requires fairly rigorous process control. Please compare and contrast BGA rework using hot air and your laser based system.
Electronics Forum | Thu Aug 24 15:35:55 EDT 2000 | jkervin
Hi Dr. Lee, Besides the requirement of a PB free surface finish on PCBs, could you tell me what the pros and cons of a Bismuth bearing solder are? Thanks, Jon Kervin
Electronics Forum | Thu Aug 24 13:21:57 EDT 2000 | Dave F
Please compare indium (In) / Tin (Sn) paste properties in terms of reflow profile, creep, grain structure, etc with other major no-lead solder formulations.
Electronics Forum | Thu Aug 24 08:59:38 EDT 2000 | Eugene Smelik
Dr. Lee, For Pb-free solders, will the reflow profile be similar to that of Sn/Pb, with an flux activation plateau before going to peak reflow, or will the profile be more linear in nature? Are there advantages/disadvantages to either profile for P
Electronics Forum | Wed Aug 23 12:11:05 EDT 2000 | Dave F
Dr. Lee: What are the issues around dispensing solder paste on 20 pitch SMT device pads?
Electronics Forum | Thu Aug 24 13:10:57 EDT 2000 | Dave F
How do these factors affect paste selection? How does paste selection affect nozzle slection?
Electronics Forum | Thu Aug 24 13:31:41 EDT 2000 | Dr. Ning-Cheng Lee
For 20 mil pitch applications, two important properties to evaluate are (1) dispensing volume consistency, (2) slump performance. As to the dispensing equipment, positive displacement will be the better choice for better consistency. Nozzle size is v
Electronics Forum | Wed Aug 23 09:16:42 EDT 2000 | Dave F
Dr. Lee: How do the metallurgical properties of solder change during a second reflow. Please provide detail on this phenomenon.
Electronics Forum | Wed Aug 23 16:32:19 EDT 2000 | Dr. Ning-Cheng Lee
"Dibasic" means a molecule containind two acid functional groups, such as carboxylic acid. The inductive effect makes the dibasic activator more active than mono-basic activator.
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