Electronics Forum | Fri Sep 04 02:09:03 EDT 2009 | sachu_70
Hi Walter, Do you refer to a sprayfluxer operation? The problem seems to be a parameter setting issue. 1. Ensure the wide angle spray reaches PCB with optimum jet pressure. You could pass a glass plate to understand flux coverage and view Jet pressur
Electronics Forum | Mon Jul 25 18:54:10 EDT 2005 | Brian
Exactly. We bring the paste apertures closer together, so that the part sits more in the center of the paste. As a CM, our customers do not always accept our recommended design changes, so we use this method to reduce our tombstoning if the pad geo
Electronics Forum | Fri Jul 15 13:16:08 EDT 2005 | Brian
We have seen this problem in the past and had to deal with similar customer constraints. It's not the flux causing the wetting, but the placement and pad geometries as some have mentioned. To reduce or eliminate the problem, we have changed the ape
Electronics Forum | Tue Dec 26 20:11:47 EST 2006 | davef
What is the make-up of the residue? Is finding this residue new to your standard operation? What has changed?
Electronics Forum | Mon Jan 08 10:29:15 EST 2007 | jaime39
The water soluble flux residue is staying there because the rinsing temperature it may be too low. The flux needs about 130-140 degrees celcius to become soft. If you are using water soluble flux, as per IPC A 610 standards it needs to be remove comp
Electronics Forum | Thu Sep 03 11:20:41 EDT 2009 | thunderdog5000
I have a customer that is having a flux residue problem after wave soldering. Flux is roaring through the board to the top side and leaving a residue. This is only happening on the flat stamped leads. The round leads are fine. They are using Supe
Electronics Forum | Fri Dec 29 01:25:32 EST 2006 | yusuf
About one year we have that problem with some of pcbs. Our customers told us about that. Because they can't mounting components on those pcb reason of flux residue. As you know flux not conductive chemical. We didn't change anything before having tha
Electronics Forum | Fri Jun 01 12:07:53 EDT 2001 | medernach
No clean residues can range in appearance from brownish gunk that looks like tree sap (because it is in some instances) to almost no residue at all. Is this product exposed to a wave soldering process or SMT? I would guess it's a wave process if th
Electronics Forum | Tue Dec 26 10:54:37 EST 2006 | yusufgomec
We use hot air leveling (HAL) process in pcb production. HAL process is 3 steps. �n 1. step flux. 2. step is HAL. And 3. step is rinsing. As you know there is mustn't any flux after rinsing operation. Our flux chemical is water soluable. But there ar
Electronics Forum | Sun Sep 27 23:10:19 EDT 2009 | hallwayit
Hi, Walter, Why don't you try no-clean flux? We ever met the same condition, later, we changed to no-clean flux solved the problem.
