Electronics Forum: solder flow (Page 1 of 85)

Overprint, solder flow back

Electronics Forum | Tue Dec 05 08:23:14 EST 2006 | davef

How about a stepped stencil? Not ideal but ... As far as overprinting goes, try: http://www4.uic.com/wcms/WCMS2.nsf/index/Resources_44.html

Overprint, solder flow back

Electronics Forum | Wed Dec 06 06:09:02 EST 2006 | Loco

Would say about the same as above, 8mm according to a cookson presentation we had, of course it would depend a bit on the paste you are using.

Overprint, solder flow back

Electronics Forum | Tue Dec 05 03:39:39 EST 2006 | pavel_murtishev

Good afternoon, Due to problems with power connector soldering I have to overprint paste on pads for this connector. Stencil thickness is 125um and I cannot make it thicker. Area ratio of chip resistor assemblies limits stencil thickness to 125um. R

Overprint, solder flow back

Electronics Forum | Wed Dec 06 16:17:31 EST 2006 | Mario Scalzo, CSMTPE

Normally, we try to limit the over print of the paste to the width of the pad on both sides. If you are using 500um pad, then I wouldn't try over a 1500um aperture. Mario Scalzo, CSMTPE, Dartmouth 6 Sigma Green Belt Technical Support Engineer - Ind

Overprint, solder flow back

Electronics Forum | Wed Dec 06 08:29:50 EST 2006 | David

Hi Pavel, We regularly use over printing on a multitude of problem parts including fine pitch QFP's. In an Automotive Environment the only thing you can change without a mountain of paperwork is the stencil. best way to work out how much you can get

Overprint, solder flow back

Electronics Forum | Wed Dec 06 07:24:22 EST 2006 | davef

Successful solder paste overprint is a function of the solder paste rheology, solder mask and through hole component stand off. * Solder mask with a high surface energy will permit a larger overprint than a solder mask with a lower surface energy. In

Wave solder flow over back plate

Electronics Forum | Fri Feb 22 14:29:55 EST 2013 | patrickbruneel

Caurbach, Higher preheat and longer dwelltime will fix your problem.

Wave solder flow over back plate

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

Wave solder flow over back plate

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

Wave solder flow over back plate

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

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