Might be past time to clean the wave guide. I have seen something like that
when dross breaks off the inside of the guide and gets mixed in with the
wave. 
I notice that three of the leads don't look like they wetted very well.  Are
you sure you have good flux coverage? 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Krug
Sent: Monday, August 31, 2015 12:15 PM
To: [log in to unmask]
Subject: [TN] Textured Solder?

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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