Electronics Forum | Mon Aug 16 16:57:06 EDT 2004 | Shean Dalton
Try to observe the board as it exits the wave, look for solder snapping as the leads finally exit the solder. The surface tension could be such that a "string" of solder stretches away from the wave until it finally breaks. Then, as the string reco
Electronics Forum | Wed Aug 11 07:41:52 EDT 2004 | gregoryyork
Check cure of solder resist. Use a No clean low solids rosin flux this will stop problem. Should see almost zero solder balls if put through a single wave compared to a dual wave. If this is true then it is a resist issue and cannot 'resist' the sold
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 | Thu Apr 16 09:33:12 EDT 1998 | Philippe
Is there anybody to help me ? We have small balls appearing on the boards soldered by wave soldering machine and it looks that use of nitrogen is linked to the problem (because without nitrogen, we have no more problems). That remind you something ?
Electronics Forum | Thu Aug 12 13:34:03 EDT 2004 | gregoryyork
Yes unfortunately solder resist again, getting boring I know. That green stuff on the boards causes all kinds of problems if not applied correctly. Can't blame the flux (as usual) or the process as he has tried all varients to no avail and therosin s
Electronics Forum | Wed Feb 02 21:17:55 EST 2000 | Steve Harshbarger
Istvan, The advise from both Roni and Mike sounds right on the money. The problem is most likely that your PCB is not completely dry (the flux has not completely evaporated) in the area where these solder balls occur. You have a number of differen
Electronics Forum | Thu Jul 17 20:46:55 EDT 2008 | davef
Which type? * Solder beads (mid-chip solder balls, attached to the waste line of your chip caps and resistors) This is more paste volume related. * Solder balls that tend to be more randomly scattered (as in spattered)? This tends to be more profile
Electronics Forum | Wed May 02 13:59:20 EDT 2001 | kt
Can anyone tell me what they think is the main cause of excessive solder at the end of the lead after wave. These are not solder peaks as if the leads were cold. It is a well wetted ball of solder on end of the lead. Also, some times you see excessiv
Electronics Forum | Mon May 07 17:59:07 EDT 2001 | davef
One thing I forgot to add about the globs of solder on your bottom side SMT components after wave soldering: The excess solder is likely reducing the reliability of these components, because of the difference in CTE betweeen the ceramic base on the
Electronics Forum | Wed May 09 11:25:29 EDT 2001 | medernach
What type of preheaters do you have on you're wave? I have to agree with Dave. Your leads are not cold, they are hotter than the annular ring on the PCB. This would cause the solder to go to the lead only rather than the component and land pad / a
