Hi Dick,
I have your picture posted, it's here:
http://stevezeva.homestead.com/TexturedSolder.JPG
You say you're seeing this on other solder joints as well, so is this just
on this board? Have you seen the same thing on other solder assemblies? Do
you know what the topside board temp is just prior to it hitting the wave?
Steve
On Mon, Aug 31, 2015 at 10:23 AM, David Hillman <
[log in to unmask]> wrote:
> Hi Dick - sometimes tin/lead solder surfaces get "texture" due to the
> solidification behavior of the solder joints. Years ago "grainy" solder was
> "bad" because the specifications required "bright and shiny" solder joints.
> Industry data has shown that solder joint appearance is not the best
> assessment of solder joint quality. There are many situations solder joints
> having "texture" is not an issue. For example, if you have a hot reflow
> profile which allows the solder joint microstructure to form large lead
> (Pb) dendrites then the solder joint surface can look rough as the
> dendrites cause topography differences. Once Steve posts the picture,
> TechNet should be able to provide a more detailed assessment.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
> On Mon, Aug 31, 2015 at 11:14 AM, Richard Krug <[log in to unmask]> wrote:
>
> > I've got something I haven't seen before. We wave soldered boards with
> > Sn63Pb37 and found a "textured" surface after soldering.
> > We seem to have good wetting, but it looks like we have "lumps" under
> the
> > solder surface. The lumps are most visible where the solder is thin, but
> > can also be found on thicker solder joints as well.
> > The application is class 3. We do monthly solder analysis on the pot so
> I
> > don't think it is contamination in the solder.
> > Any insights would be appreciated
> >
> > I know the picture will be stripped out of the message, but I'm copying
> > Steve Gregory directly in hopes he can post the picture.
> >
> > Steve - Please post this picture to go with my question for the TechNet
> > forum. Thanks in advance.
> >
> > Dick Krug, CSSBB, CSMTPE
> > Lead Process Engineer
> > Sparton Brooksville, LLC
> > 30167 Power Line Road
> > Brooksville, FL 34602-8299
> > (352) 540-4012
> > [log in to unmask]
> >
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