Electronics Forum | Wed Feb 02 09:58:00 EST 2000 | Dave
Ashok, I don't understand what they're saying about the gray joint. Usually a gray joint has to do with too much heat. Also, the higher the temperature the lower the fillet because of the increased viscosity of the solder. Correct? Wouldn't yo
Electronics Forum | Tue Dec 07 05:16:12 EST 2004 | kanwal324
We are using solder paste of Alpha Metals 390DH4. As per manufacturer guidelines the viscosity of paste after 1/2 hr. conditioning and after mixing in paste mixer,it shoule be between 800-1250KCP. Our customer is asking for viscosity to be maintained
Electronics Forum | Mon Sep 25 10:18:00 EDT 2000 | Vic Lau
Dear Friends, I am handling a new project, and search for a solder paste stencil printer (automatic or semi-automatic) for lead free solder paste. The one I had looked for is MPM3000 series, however, what I heard from other freinds, those model is
Electronics Forum | Wed Oct 28 17:05:24 EST 1998 | Dave F
| Has anyone found a way to control viscosity of no-clean paste? | Mike: Mix it well and use the stuff before viscosity becomes an issue. Dave F
Electronics Forum | Thu Jun 24 23:00:36 EDT 2004 | yukim
Tried with several lots of solder paste, manufactured in Feb and March this year. Work ambient: 25C, 60~70%. Is this humidity too much? I'll reduce the ramp in our profile. One change: We changed the conveyor motor in our reflow oven just before the
Electronics Forum | Tue May 02 05:59:28 EDT 2006 | davef
We agree with Ken's points about off contact / screen versus stencil, but this DHolt is talking stencil [regardless of what is typed about screens]. Comments are: * On "smears under the stencil": smearing happens. It makes us wonder about the frequ
Electronics Forum | Fri May 09 14:56:37 EDT 2008 | markhoch
The paste dispensers work well as long as the humidity in your shop is properly controlled. If it gets too humid, and the paste gets "soupy", then it will take less air pressure to dispense it onto the stencil. Paste dispensers use a controlled, pre-
Electronics Forum | Tue Feb 12 18:48:48 EST 2008 | larryd
Thanks for the spare change. Questions are good and I did miss one item. Process has 100% solder paste inspection with a 3D inspection machine that has very few false calls or accepts. Ramp to peak is less than 1.5C/sec. Profile looks good, solder
Electronics Forum | Thu Oct 07 18:24:01 EDT 1999 | Jason Gray
Make sure you check the MSDS for the new paste. If you have more than one production line, I'd suggest a gradual changeover. One selling point for management would be the free training Multicore will give you for the switch. If you haven't already
Electronics Forum | Thu Oct 07 20:43:16 EDT 1999 | Dave F
| Make sure you check the MSDS for the new paste. If you have more than one production line, I'd suggest a gradual changeover. One selling point for management would be the free training Multicore will give you for the switch. If you haven't alrea
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