Good picture! Now comes 20 questions: what was the solder alloy used, the
soldering method used and the component surface finish?

Dave

On Mon, Aug 31, 2015 at 11:48 AM, Steve Gregory <[log in to unmask]> wrote:

> 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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