Electronics Forum | Fri Oct 29 13:45:03 EDT 1999 | David Vulcano
We are placing several axial components that have STEEL leads. Have noticed that the steel components do not get good flow thru(we manufacture to IPC-A-610 Class II Standards which reqires 75% flow thru) We are using Seho Wave Machines with Nitroge
Electronics Forum | Tue Nov 02 23:34:58 EST 1999 | chartrain
You appear to have two problems working against you at once. One is component lead corrosion that the no clean flux isn't aggressive enough to remove. Do a simple dip and look test. Flux the leads of a component and dip it into the molten solder for
Electronics Forum | Tue Nov 02 17:52:17 EST 1999 | Dave F
Jim: Several points: 1 If you�re correct about corrosion of your component leads (which is entirely possible if the leads are steel, as you say), then the AIM 264-5 no-clean may not be aggressive enough to remove the corrosion you are seeing routin
Electronics Forum | Fri Feb 22 14:29:55 EST 2013 | patrickbruneel
Caurbach, Higher preheat and longer dwelltime will fix your problem.
Electronics Forum | Thu Feb 21 12:02:03 EST 2013 | pbarton
We agree with all of what Patrick has said. Hopefully your equipment is capable of the ideal setup you describe with no back flow until the product hits the wave and then back flow until the product emerges the other side. One other reason to strive
Electronics Forum | Wed Feb 20 18:21:49 EST 2013 | caurbach
A question for all you wave experts out there: We run our wave with a constant flow over the back plate. I know it's recommended that we set the back plate so that the solder sits just at the top of the back plate with surface tension keeping it fr
Electronics Forum | Fri Feb 22 09:41:54 EST 2013 | patrickbruneel
Pete, It would even be better if the wave machine manufacturers would add a feature that allows the wave to drop in rpm when a board passed the wave, and slowly get the wave back to normal rpm when a new board approaches. This would be like a reset
Electronics Forum | Thu Feb 21 10:11:36 EST 2013 | patrickbruneel
The backflow in the wave started to become very important with the development of no-clean/no residue fluxes. These fluxes don’t have (or at least shouldn’t have) rosin, resin or other vehicles in the formulation which encapsulate surface oxides from
Electronics Forum | Fri Feb 22 13:19:54 EST 2013 | caurbach
Our new Soltec Delta 3 has this feature (they call it mainwave pushup) where you can add up to 60 rpm to the pump after the leading edge passes over the wave. Unfortunately, our old Delta Wave doesn't have this feature. Ideally we'd like to set it
Electronics Forum | Mon Sep 24 20:33:34 EDT 2001 | davef
Assuming you're seeing this during wave solder, the via acts like a heat pipe conducting 450�F [or whatever] air to your solder balls. Check the fine SMTnet Archives for similar threads and perspective on the direction to take.
