Electronics Forum | Mon Sep 17 03:59:52 EDT 2012 | stivais
Hi guys, We have an interesting case we haven't seen before (see the picture below) http://postimage.org/image/lu2f4ae55/ Solder balls form on unpopulated pads after reflow. 1. Reflow profile is fine. 2. Stencil thickness / paste volume is also f
Electronics Forum | Mon Apr 19 02:49:56 EDT 1999 | Raul N.
25 PPM)! 1. Is there a better process to solder the leads of QFP's with lifted "minute" lifted leads still having a realiable solder joints? 2. Or has anybody tried modifying solder pads and use thicker solder paste deposit to compensate for the ga
Electronics Forum | Tue Jun 04 17:05:52 EDT 2002 | davef
Solder balls floating around on the air currents of a reflow oven. I sincerely doubt it. Could the solder on your gold fingers be from: * Excess placement force during P&P? * Ejactula from solder deposits during rapid preheat ramp rates? * Ejactula
Electronics Forum | Mon Jun 10 13:31:29 EDT 2013 | emeto
Is there anything on the other side of the board? If not the process will be very standard. 1. SMT - place the small parts on your board. It is called surface mount technology. Basically one machine applies solder paste on the board, another machine
Electronics Forum | Mon Jul 29 19:39:57 EDT 2013 | hegemon
No problem running lead free without nitrogen. Careful profiling will take care of the soldering. Cosmetically, the Nitrogen reflow is superior for lead free, and we see much better wetting, better coverage of the PWB pads, and of course the smooth
Electronics Forum | Tue Sep 28 17:16:55 EDT 1999 | Scott Cook
| There is a company selling pcb with the solder past on the pads and coated with a tacky film to hold the part during assembly. Have you heard of them and can you tell me how to contact them? | Contact Matt Kehoe at 770-475-4576 or 847-740-4120 T
Electronics Forum | Thu Aug 12 17:26:31 EDT 1999 | Brian Wycoff
| | | | Hello, | | | | I am currently looking for a solder paste height inspection system (preferably one that will go in-line). | | | | Can anyone reccommend any? | | | | Thanks | | Steve | | | Steve, | Cybersentry makes an easy to pr
Electronics Forum | Thu Feb 28 20:55:31 EST 2002 | djarvis
Hi Nightbull, I'm with Dave. Don't see the need. Good stencil, good operator, reasonable machine with at least manual vision alignment, good set up, solder paste that satisfies you and the customer, regular maintenance, and how can you go wrong? As
Electronics Forum | Fri Oct 17 14:33:05 EDT 2003 | AXL
Wait a minute I thought I said Celestica and a few others have done the Engineering evaluations on a list of 10 top solder paste's and Indium SMQ92J and Kester's R560&562 came out on top. First you say 'don't trust all of the so called experts on thi
Electronics Forum | Thu Mar 01 12:08:33 EST 2007 | rob_thomas
It sounds like something is a little off here. ROHS compatible and ROHS capable parts are going to be ok with a leaded solder paste and processing unless you are building high reliability product.( some are going to argue that even high rel products
