Electronics Forum | Thu Feb 13 08:52:44 EST 2014 | island2013
Are you're preheat settings the same? Are you sure you're not burning off the flux before it gets to the pot?
Electronics Forum | Thu Nov 05 20:53:37 EST 2015 | shuttlestar
It's a strange task . if your PCB is very very small ,using topside heat is not a big problem . but for a whole PCB board . if delete the step of preheat, it will broke the whole PCB . BTW,do you finish your task ?
Electronics Forum | Fri Jun 12 23:52:42 EDT 2015 | armandogomez
Reflow? or Wave solder? or selective wave solder? For what I understand you problems is with the preheaters you have a high temp that dries up the flux, and when hits the wave is doing that, do you have a thermal profiler? what's the temp just befor
Electronics Forum | Wed Jun 21 09:12:42 EDT 2017 | emeto
I would start with checking the flux amount and trace and the thermal profile(preheating is important) for this assembly. Then I would consider changing to another flux and run it again.
Electronics Forum | Fri Jun 23 12:11:26 EDT 2017 | rgduval
I haven't tried doing these, personally...but... - Try a pre-heater? - IR rework station? Off the top of my head, that's all I've got. Cheers, ..rob
Electronics Forum | Fri Jun 23 15:11:11 EDT 2017 | emeto
Try add a pre-heater. If not change the process or the machine. With KISS you will hardly get any PCB to work properly.
Electronics Forum | Tue Jul 30 10:44:20 EDT 2019 | vchauhan
Can anyone please share a document which details about the soldering defects if you have less or the excessive preheat time, soak time, peak temperature, time above liquidous (TAL)and cooling time. Appreciate your help in advance.
Electronics Forum | Wed Dec 04 02:46:15 EST 2019 | collum
We use the flux Cobar 94-SEL with excellent results. It is a special flux for selective soldering process. When the temperature of the board with flux (preheating or during soldering) reach more 130°C, the rests of flux are deactivated (no more dange
Electronics Forum | Tue Jan 12 15:11:20 EST 1999 | Earl Moon
| | I have an Electrovert UPK 660c fitted with IR preheats top and bottom. We assemble a large range of multilayer backplanes and I was wondering if there are any advantages in changing to convection preheats.Has anybody got any views on the subject.
Electronics Forum | Mon Sep 14 17:39:37 EDT 1998 | Steve A
| I am running composite fixtures on my wave solder machine and after about 500 passes each (1 month)they are showing serious signs of wear in that the composite surface is bubbling up and glass fibers are also starting to show. | The problem here
