Electronics Forum | Mon Feb 28 11:31:08 EST 2005 | russ
This sounds a lot like a profile that is killing flux activity prior to wave immersion. What is your topside preheat temp just prior to hitting the wave? What type of preheat do you have, convection or radiant? Are you using a chip/turbulent wave
Electronics Forum | Sun May 02 19:09:46 EDT 1999 | JohnW
| | | Ok folk's has anyone used Alpha Metal's UP78 solder paste ? | | | | | | Our place is looking to move to that as the way to go, getting rid of the Hereaus 362's and Alpha 737's of the current set up. | | | | | | My question's are really : | |
Electronics Forum | Sat May 08 07:41:00 EDT 1999 | wayne sanita
hello, i have been using up-78 ultraprint for over a year now. at first we were getting lots of solder balls mainly on 0805's. this happened with all paste we used, too much solder under component leads. i have been using apertures reduced 10% homepl
Electronics Forum | Fri Oct 23 16:01:18 EDT 1998 | Earl Moon
| I need some info on how to stop the bridges I'm having on | radial and axial parts that are in the same place on every board. I'm also having problems with sot-25 bridging. I'm using a Electrovert E-pak. I tried leveling the machine,solder pot, an
Electronics Forum | Mon Oct 26 16:01:33 EST 1998 | tom Gervascio
| | I need some info on how to stop the bridges I'm having on | | radial and axial parts that are in the same place on every board. I'm also having problems with sot-25 bridging. I'm using a Electrovert E-pak. I tried leveling the machine,solder pot
Electronics Forum | Wed Dec 21 17:11:58 EST 2011 | davef
Kim: We understand what you're saying. For us, fluxing the BGA and activating the flux are the issues. * If you're squirting liquid flux under the BGA with a plastic bottle with a needle tip on it and then reflowing less than the whole board with a
Electronics Forum | Thu Oct 20 23:01:12 EDT 2005 | davef
A highly activated flux will allow intermetallics to form, because the hydrogen halide gas that formes at operating temperature will react with the refractory nickel oxide. Refractory nickel oxide is what makes SS "stainless". This will be worse wit
Electronics Forum | Mon Aug 25 15:40:58 EDT 2008 | dyoungquist
I am seeing poor quality solder joints, mostly on 0402 components. The problem is that while the pad on the pcb is getting fully wetted, the solder is not flowing up the sides of the 0402 component, i.e. the 0402 lead is somewhat de-wetting. The re
Electronics Forum | Mon Aug 13 21:04:15 EDT 2001 | davef
What??? You don�t have enough things to monitor? The origin of some profiles is mysterious. It�s probably good to try to understand such mysteries. Certainly, the important determinants in the design of your reflow profile are: * Paste you�ve sel
Electronics Forum | Thu Aug 31 18:48:25 EDT 2023 | SMTA-64387600
I presume you have a local flux spray with your selective solder machine (I have no idea what you use). If I have a group of leads in close proximity like this, I would be trying to design a well and nozzle setup that I can use to solder all the joi
