Electronics Forum | Wed Oct 02 18:18:58 EDT 2002 | davef
The steadfast rule of thumb is: In order to get reliable reflow, you need to be at or higher than [liquidus + 20�C] for about 5 to 10 seconds, rather than those old "60 seconds above 183�C" guideline. This provides for setting your peak based on the
Electronics Forum | Wed Oct 09 16:59:35 EDT 2002 | davef
Russ, as I told Eric the other day ... The steadfast rule of thumb is: In order to get reliable reflow, you need to be at or higher than [liquidus + 20�C] for about 5 to 10 seconds, rather than those old "60 seconds above 183�C" guideline. This prov
Electronics Forum | Tue Dec 10 20:42:43 EST 2002 | davef
Vijay, Sounds like you're not spending enough time at liquidous plus 20*C. And you need to stay there for 5 to 10 seconds. I know, I know. We have used bucketsful of WS609 over the years. See, as you say, the melting point of your solder alloy
Electronics Forum | Mon Jan 20 19:07:41 EST 2003 | slthomas
Sorry, what I meant was that they don't provide a duration for that liquidus + 20�C value that I've seen bantered about here and on TechNet. They only provide the same stock time above liquidus of 30-90 that they've always used. I'd like to see refe
Electronics Forum | Mon Dec 20 10:08:52 EST 2004 | mlogic
Hello, I am trying to get hold of frame Hold Down bars for a Dehaart EL20c and all the listed numbers for Dehaart and Lake Madsen are disconnected..... any ideas? I have tied 887-469-3570, 781-270-3285, 781-270-5274, 781-270-3614, 781-272-0794.. Al
Electronics Forum | Fri Jun 03 16:40:48 EDT 2005 | Andrea
I have a customer who has put a restriction against pure tin finish components. We have gotten our BOMs compliant with all but 5 parts. Fairchild p/n FDD6512A, FQD12N20C, IRLM120A Bournes 3214G-1-501E Sprague 10TS-D10 I am looking for a standard pr
Electronics Forum | Tue Aug 23 14:23:00 EDT 2005 | pjc
Most ovens I know use oil to lubricate conveyor chain, not grease. Anyway, is this what you're using: NMG No Melt Grease NLGI 2 (operates from -20�C to +270�C) NMG is a long-fibred highly adhesive grease which does not melt or drip at high temperat
Electronics Forum | Wed Feb 08 07:52:21 EST 2006 | davef
'TAL' is a poor measure of solder connection heating. In a reflow process, what you need is about 5 seconds at liquidus for the specific solder plus: * 20*C when soldering to Cu. * 35*C when soldering to Ni. This time over temperature is measured
Electronics Forum | Mon Jun 18 10:11:52 EDT 2007 | dyoungquist
Almost every board/panel we build is double sided and we use an MPM SPM screen printer with no problems. The screen printer is not the cause. We have seen heavier parts fall off the first side when going through the reflow for the second side. We
Electronics Forum | Wed Jun 27 11:59:55 EDT 2007 | samir
*Preheat zone *Maximum slope is a time/temperature relationship that measures how fast the temperature on the printed circuit board changes. The ramp�up rate is usually somewhere between 1.0 �C and 3.0 �C per second, often falling between 2.0 �C and
