Electronics Forum | Wed Apr 03 19:03:31 EDT 2013 | hegemon
In agreement, in that you should have already printed enough paste on the board to accomodate the joint. Adding paste would give the result you described. (too much solder) Adding a little flux (only) and heat would be the correct path out of that s
Electronics Forum | Thu Apr 05 12:25:01 EDT 2001 | davef
Talk about bucking the trend!!! OK, OK, I know some US military work still requires RMA. You�re both correct. Cleaning decisions for RMA fluxed boards are based on customers requirements. [Some do (clean) and some don�t.] Older US military speci
Electronics Forum | Wed Jan 17 22:35:21 EST 2007 | JNet
Is the oven air or nitrogen? If it is air I would suggest more exhuast to pull the flux vapors out if the oven before they can condense in the cooling. If it is a nitrogn machine that makes it a little more complicated. If the filter system is clogge
Electronics Forum | Mon Jul 25 06:12:53 EDT 2005 | lloyd
Folks thanks for all the info, I'm gonna check out our pad geometries and see how they compare with industry standards. Brian, could you elaborate a bit more on the stencil design you have mentioned. Do you mean that you have offset the stencil aper
Electronics Forum | Wed Apr 03 04:08:20 EDT 2013 | ericrr
Yes well, now we used to add a bit of flux to our leaded paste to make it slightly runny, But when we went to unleaded paste the joker who came in from another company to set the temperature on the oven said "you dont add anything to unleaded paste!.
Electronics Forum | Wed Feb 07 23:30:13 EST 2007 | KEN
I have a customer who runs A-D applications with 5GHz analog and it is 100% no clean. The only answer that will be acceptable is what works for your circuit design.
Electronics Forum | Thu Aug 28 16:03:08 EDT 2008 | wavemasterlarry
I guess you're adding the gas to keep the fingers clean - sounds likeyou got your threads mixed up on the Forum. Any way I would suggest not doing this. Gas is pretty flammable. I have pix of one our Hollis cleaning machines going up in flames cau
Electronics Forum | Thu Jul 10 10:25:05 EDT 2008 | gregoryyork
I guess the paste is Leaded hence the 220 Peak temp and the Sn100c is Eutectic at 227C so you need to be hotter to melt the HASL finish or you are relying on it alloying together with the paste which takes much longer. suggest running peak temp of 23
Electronics Forum | Tue Jul 08 22:44:06 EDT 2008 | proy
I made progress and almost acceptable results by adding heat to the bottom of zone 4 HOWEVER, the core problem I uncovered last night/this morning was that the #4 top side blower had failed. I think this is the key why I was having so much trouble.
Electronics Forum | Thu Nov 11 11:48:57 EST 2004 | rlackey
Adding flux prior to reflow was not an uncommon process on certain packages - a couple of our Universal GSM'S have flux heads for this reason (Not that we've ever used it on anything). What is the component they are suggesting using additional flu
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