Electronics Forum | Thu Aug 24 15:37:50 EDT 2006 | Chunks
Hi Any, This is from an earlies thread "Solder Ball After Reflow Process". Date: August 16, 2006 01:52 PM Author: Russ Subject: Solder Ball After Reflow Process Oven settings are meaningless here. What does the board see? It is the paste we a
Electronics Forum | Fri Jul 23 14:41:41 EDT 2004 | Steve Stach
Dear JSK, It sounds like the root causes of your problem are two fold. First, excessive heat will polymerize the abietic acid found in rosin forming neo-abietic diamers and polymers which are much less soluble than the parent monomer. There are
Electronics Forum | Fri Apr 29 14:16:16 EDT 2011 | ppcbs
Below is the long explanation. This defect is most commonly found with BGA components, but can arrise with all components. I see it happening more now with lead free boards that are being assembled with a no clean flux. Best short term remedy is t
Electronics Forum | Thu Jun 27 13:33:21 EDT 2019 | duchoang
Wash the board or do what ever to get rid of flux /flux residue at the parts before running second side. If you can, use special reflow profile for the second side ( Less heat for bottom side).
Electronics Forum | Fri Jun 26 14:08:49 EDT 2020 | indhu
Hi, I am having a issue that SMT nut drop after reflow. The solder height all in specifications. Had tried adding flux inand the solder paste. But shows no improvement. Is the nut easily oxidize? Can anyone help me on this?
Electronics Forum | Fri Apr 09 09:08:40 EDT 2010 | cast2010
Hello, I produce two types of board. - 100% Thru Hole - 50% thru hole and 50% SMT For the second, I have a bad wetting after the reflow on the top. The pcb board have Au-Ni pad. I use a water soluble paste. I clean the board with a solution with
Electronics Forum | Wed Feb 26 23:59:48 EST 2003 | Mike Konrad
Grant, No-Clean paste + IPA = White Residue! #1: Stop using IPA #2: Switch to either a solvent-based de-fluxing chemical or an aqueous-based de-fluxing chemical. If you are using an ultrasonic cleaner for your boards as stated, do not use sapon
Electronics Forum | Thu Jan 18 12:21:57 EST 2007 | tonang
How to reduce flux contain on PCB after reflow process?
Electronics Forum | Fri Feb 10 13:02:00 EST 2023 | stephendo
Those capacitors look totally fluxed. I can't tell if the last photo is showing a concavity or a blob of stuff. I think it is a blob of flux and contaminants. Does it burn off with a soldering iron?
Electronics Forum | Thu Jan 23 14:19:56 EST 2003 | Mike Konrad
Hi Randy, No-clean flux needs to be activated in order to burn off the volatiles in the flux. This normally occurs partly during preheat and certainly during the reflow or soldering process. In most hand soldering applications, an operator applies
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