Electronics Forum | Tue Oct 01 16:33:33 EDT 2002 | slthomas
I know, I know. It's not a "solution", per se, because it's a bandaid for bad fabrication, packaging, and storage practices. Still, it's a reality with our overseas CM that has a plant in a very humid environment. Is 16 hours @ 105C the safe way to
Electronics Forum | Sat Mar 29 13:35:32 EST 2003 | MA/NY DDave
Hi Back later on this tread, yet I did want to slightly correct one thing DaveyF wrote. Again only slightly. Even at 90C, moisture does start to leave the board. Now it doesn't do it so well as above 100C at sea level atmospheric pressure, yet it s
Electronics Forum | Wed Jul 23 05:47:53 EDT 2003 | iman
Yo Thanks! right on the money pad, the pinhole occurs mainly in the (fillet's) top-surface central of the whole solder (fillet surface) area. Like you said, large surface area, lowest surface tension. that's a possible cause, that the potential voi
Electronics Forum | Mon Aug 16 04:55:30 EDT 2004 | roel
Concerning the solder-balls, there are a few causes for this. Try to slow down your solder-speed (P.e 80cm/min). Can you measure temperature after the pre-heat zone? Are there also blow-holes in the joints? Personally I think there is some water in t
Electronics Forum | Fri Apr 13 15:25:37 EDT 2007 | scunneen
Hello All, I am working with a Mid Sized PCBA Manufacturer as a process Engineer. We have recently moved 1 of our customers to RoHS(Silver Immersion) boards. We are seeing a lagre number of issues Blowholes, allignment issues, board quality etc. We
Electronics Forum | Tue Sep 11 15:08:11 EDT 2007 | shrek
KRIKIES! If that wasn't a sales pitch, I don't know whut was, me lad. Optimizer is good for DoE's and process characterization, but no substitute for the artform that is wave soldering. When me lads here in Purchasing get PCB's from all over the w
Electronics Forum | Thu Sep 27 10:53:59 EDT 2007 | gregoryyork
Joris, > > Yep, very common to have those small > blow holes in lead-free alloys. We used to get > them very consistently on white-tin finished > boards, and less frequently with gold finished > boards, for what ever that is worth. > > IPC-6
Electronics Forum | Sat Jan 19 10:56:26 EST 2008 | slthomas
Dave that's actually what I want to work on the next time we run these. Our issue with these right now is that weight distribution on the boards mandates that we break a 4-up panel into two pieces and run it 90 degrees to the ideal orientation (=s wh
Electronics Forum | Wed Oct 02 20:59:23 EDT 2002 | davef
We�ve been stewing on this and it just dawned on us the part that�s missing. Blow-holing is caused by BOTH of the following: * Moisture absorption by the resin that holds the board together. [Steve is addressing this with his various baking schemes
Electronics Forum | Wed Jul 21 13:18:19 EDT 2004 | patrickbruneel
Thomas, The first thing I would suggest you to do is identify the type of problem your dealing with �pinhole� or �blowhole� before you can take the appropriate action to correct the problem. A pinhole is a void or cavity caused by non-wettable part
