Electronics Forum | Tue Jul 23 15:41:31 EDT 2002 | habs24
Does anyone have any information or experience soldering of class 3 products with WS fluxes. We are currently leaning toward Alpha WS609 flux, however the customer's interpretation of J-Std-001C feels that type 'H' fluxes (WS) are not allowed. Any
Electronics Forum | Wed Apr 09 10:17:28 EDT 2003 | ksfacinelli
http://picturecenter.kodak.com/share?invite=ZExr4tzrmmYeI5Uozhlo Here is a link to the pictures. This is a HASL board with ws-609 paste. Lead parts look good but would like to see a shinner joint in the BGA area. Thermal profile looks good 150-15
Electronics Forum | Fri Jan 18 18:19:38 EST 2008 | arun2382
Is normal DI rinse cycle enough to wash away all residue after SMT assembly of high density substrate? This substrate would later be over molded to form MCM module package and I am seeing delamination in high density areas of the substrate at MSL3
Electronics Forum | Tue Jan 29 13:51:24 EST 2008 | bbarton
Dave F....BOGUS BOGUS BOGUS What compatability issue could there possibly be if the flux is removed during wash???? Why on EARTH would you leave ANY WS flux residue on the board? A recipie for disaster! Beef up the cleaning process, test for contami
Electronics Forum | Sun Feb 03 16:50:59 EST 2008 | bbarton
Won't argure with you Davef, but guys who suggest totally unnecessary steps to resolve a cleaning problem drive me NUTS!! What would the moulding compound manufacturer have to do with it? HIS BOARD IS NOT CLEAN!! Keep it simple, get the job done! Don
Electronics Forum | Fri Feb 29 07:32:43 EST 2008 | samitokgoz
We have the same problem... We are using water soluable solder paste (Alpha ws609) and it dries out very quick. I don't want to throw out the paste inside the printer, but on the other and I don't want to risk my production by adding flux or alchol o
Electronics Forum | Fri Feb 29 08:14:33 EST 2008 | cyber_wolf
Thats funny that you mention the WS609. That is the exact same paste we used back in the early 90's. That formulation is notorious for drying out and getting chunky. That is a very dated flux chemistry. I would advise looking into some of the twenty
Electronics Forum | Mon Jun 06 12:51:17 EDT 2016 | wlsmt
My operator applied flux gel ALPHA WS-609 on MG P/N FTH101XAP (CAP ALUM 100UF 50V 20% SMD) before aqueous washing the PCBAs. Solder paste used was ALPHA WS-820. Now the caps have yellow stains. Any solution to this is appreciated. Tks
Electronics Forum | Tue Jun 07 10:24:59 EDT 2016 | davef
wlsmt: You’ve got to help us out here: * Why did you apply solder paste to capacitors prior to water washing the PCBA [where the caps were attached?]? * Did you reflow the Alpha WS-609? * How is the Alpha WS-820 involved in this? * Talk about the
Electronics Forum | Tue Sep 21 13:43:33 EDT 1999 | Glenn Robertson
| I've had some trouble pasting a test board for a MicroBGA trial. Most of the paste remains in the stencil apertures. | The stencil is 6 mil thick, laser cut and electo-polished. | The apertures are 12 mil in diameter with 20 mil pitch. | We are usi
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