Electronics Forum | Tue Dec 31 02:10:04 EST 2019 | sssamw
It looks like solder dross there or flux residue that not activated well. Your speed is 43cm/60s, wave width contact is 2cm, so dwell time is 2x43/60=1.43s, it's short also.
Electronics Forum | Thu Jul 19 17:22:17 EDT 2007 | gregoryyork
You need to dwell the boards longer in the wave as the board is the largest heatsink. Just make sure the flux can take the longer dwell times anything up to 4 - 5 seconds so you may have to shallow your angle as well to around 5 - 6 degrees this will
Electronics Forum | Fri Aug 07 15:56:56 EDT 2009 | davef
Well, since you've gotten no takers, we'll launch in to this with careful analysis and introspection, fully aware that we're likely to get 'blasted' for any number of reasons. The most critical parameters to monitor for proper wave solder machine pr
Electronics Forum | Fri Feb 16 02:00:12 EST 2001 | PeteC
Dreamsniper, The optimum contact (dwell) time in the wave should be 2 seconds. Contact band width is a function of conveyor speed. For an example, 5cm of contact band width at 150cm/min. conveyor speed will give you 2 seconds of contact time and 2cm
Electronics Forum | Thu Apr 14 13:49:34 EDT 2022 | winston_one
Thank you for reply, Stephen. No, As I wrote it was leaded process. I heard that it is possible with lead free solder at higher temps an dwell time. At NPL Defect Database I've find this case wich looks exactly the same: http://defectsdatabase.npl.co
Electronics Forum | Wed Jun 24 09:23:35 EDT 1998 | Chris Kelly
What is your current solder pot temperature? Whatever that temperature is, has it been verified/calibrated? What kind of flux is being used? No-clean, OA, RMA? How is the flux being applied to the PCB? Is this problem occuring on ALL negative termi
Electronics Forum | Mon Jun 16 16:57:34 EDT 2008 | ldavis
We are using VP on all of our lead free assemblies. 1. We are getting great, very repeatable results. 2. The profiles were created during the implementation of the equipment and we only change 3 parameters for each assembly processed. Heater power,
Electronics Forum | Sat Sep 16 15:50:48 EDT 2017 | ctran
An assembly with this improperly solder joints will have functional issues. We have encountered this many times with memory modules failures,RMA units. Reflow always solved the problem (in our many cases). Dwelling time may be the key to solve this.
Electronics Forum | Tue Jul 14 15:21:28 EDT 1998 | Brian Conner
| We are wave soldering a board having 24 similar thru hole connectors on it, using a wave soldering pallet. The problem is that one particular pin of connector in around 6-9 connectors get excess solder on the bottom side. I have tried all the par
Electronics Forum | Mon Mar 21 02:51:23 EST 2005 | amstech
I have done few thermocouples using high lead solder, silver epoxy that is used for die attach purposes and some X - non conductive material. Though all materials show a slight variation in temperatures (3 to 5 degree C), the dwell time at peak is qu
