Electronics Forum | Wed Aug 23 17:15:25 EDT 2000 | Dr. Ning-Cheng Lee
The ternary SnPbBi phase does form commonly when Pb and Bi are combined. No special condition required. Presence of this phase jeopardizes the reliability for applications involving temperature near 96C. Using low temperature solders means a lower s
Electronics Forum | Thu Jul 20 14:16:42 EDT 2000 | Bob Willis
Only used adhesives once and it was a disaster. I don�t rearly have much experience but the real problem is everyone wants to compare adhesive with solder and they will not give the same results. There is a good book on adhesive check out my book re
Electronics Forum | Tue Jun 06 14:31:42 EDT 2000 | Jeff Sanchez
I have 25#'s of bismuth in my shop. I wanted to add some to my 63/37 till it was eutectic. This would allow me to lower the waves temp. Can I do this and still meet standards? Also would it make the solder joints to brittle and would discoloration be
Electronics Forum | Thu May 17 08:28:14 EDT 2001 | wavemaster
I would have to agree that the leads are probably geting to hot, but there are many factors that could be the root cause. I would suggest doing a experiment with a solder sample and make 2 recipes. One with a relativly cold profile and one with a r
Electronics Forum | Mon May 07 09:47:11 EDT 2001 | orbotech
All defect types that can not be seen from top view, meaning - any defect which is characterized by more than its top 2D appearance will be hard, if at all possible, to detect by 2D imaging system. This includes: Lifted leads / co planarity J-lead
Electronics Forum | Thu May 10 15:48:12 EDT 2001 | kp
Good morning, We are presently using a couple surface mount parts on our circuit boards. We send the boards out of house to have the SMD parts placed. I have been told that the apertures for the stencil for each SMD are not to be 1:1 with
Electronics Forum | Fri May 11 10:30:26 EDT 2001 | rkevin
I am looking for info. (pro and con) and/or 1st hand knowledge processing PCB's with Immersion Tin finish through SMT and Wave. Do profiles need to be different? Solderpaste considerations? Anything else? In the past I have experienced selective non
Electronics Forum | Thu May 17 12:59:09 EDT 2001 | rwilliams
I would like to know peoples' thoughts on measuring solder paste height. I am having difficulty fully understanding its value. Is it better suited to a production environment, or more of a lab environment? Our screen printers are not fitted with on-
Electronics Forum | Fri May 18 13:41:34 EDT 2001 | mparker
Good ol' Yankee engineering always says "More is better" You have got to be careful that with more epoxy volume you run the risk of the epoxy merging with solder paste if you are using a glue and paste process. In addition, if the epoxy can spread o
Electronics Forum | Wed Jun 06 03:12:06 EDT 2001 | ianchan
Any blokes in process/QA, can recommend a solder volume, measurement machine, that has proven reliability, in its data readings, prefer that it comes, similar to "SMT m/c" camera-program-function, to remove operator-user variation. Appreciate any hel
