Electronics Forum | Wed Feb 01 09:26:39 EST 2006 | pjc
Density is an "implied" measurement to determine activity. Most flux suppliers can sell you a flux acidity (activity) measurement kit. I used one from Multicore a few years back. We used it once in the morning and once after lunch to monitor no-clean
Electronics Forum | Fri Jul 18 11:05:07 EDT 2003 | davef
A highly activated flux will begin to corrode the imm tin coating after 10 minutes. Corroded tin has poor solderability.
Electronics Forum | Thu Sep 04 16:43:00 EDT 2003 | coeps
I have never used Manganin wire. I understand it is difficult to solder. Should we use a move active flux. It will be a .25mm, PTFE insulated manganin wire spliced to thermistor wires. Thanks coeps
Electronics Forum | Thu Aug 12 18:06:09 EDT 2004 | SR
May I ask what component types you are using and who the suppliers are? FYI - If the components have exceeded their shelf life, they may have oxidized too much for soldering using low activity fluxes. Thanks and best regards, SR
Electronics Forum | Tue Jul 24 07:57:55 EDT 2007 | davef
It sounds like the QFN component is not solderable. * Use ANSI/J-STD-002, Solderability Tests for Component Leads, Terminations, Lugs, Terminals, and Wires * Contact your QFN component supplier for help * Consider a more active flux, since you might
Electronics Forum | Mon Oct 27 23:25:56 EDT 2008 | davef
Each thermal cycle decreases the thickness of the OSP. So depending on the material, fabrication method, and blablabla; after one thermal cycle we'd expect the OSP to provide adequate protection for a couple of days. After that, you may need a more a
Electronics Forum | Sat Apr 18 09:44:46 EDT 2009 | davef
Low tombstone pastes have been around for 8-10 years. Talk to your paste supplier about suggestions of the "latest and greatest." Usually these pastes: * Are a blend of alloys with slightly different melting points * Have a mid-level activity flux *
Electronics Forum | Mon May 14 16:36:58 EDT 2012 | davef
You're thinking correctly in trying to improve your process. Can you change to a more active flux? Look at the copper that connects to the center pin. You may need to relay-out the board to add a wagon wheel style thermal relief in that area.
Electronics Forum | Wed Apr 26 09:20:43 EDT 2006 | PWH
I've seen failures like this with multilayer parts that seem to be affected by high activity flux during SMT (water soluable in this process). High, high failure rate in our case. I'm not sure what was going on with our parts but we thought maybe t
Electronics Forum | Thu Jul 06 12:52:35 EDT 2006 | samir
..and he can put the flux in and keep it a secret too from his customer.. RSS profile on wave?? I never heard of a soak zone for wave preheat...you may be burning off your activator..hence, the beads. For wave preheat, your main goal is to ramp up
