First, thanks for posting picture Steve.
I'll try to answer all questions received thus far.
Solder is Sn63Pb37
Board is wave soldered.
Topside board temp before the wave ~115C
Leads of this component are solder dipped, alloy not specified, but SnPb. Similar appearance on virtually all solder joints on the board.
This result was found on all boards of this work order, but not on other assemblies soldered on the same wave.
Flux coverage could be a cause, but dross is unlikely since not on other assemblies.
Flux is ORH. Boards have been washed with saponified water.
Thanks for the questions.
Dick Krug, CSSBB, CSMTPE
Lead Process Engineer
Sparton Brooksville, LLC
30167 Power Line Road
Brooksville, FL 34602-8299
(352) 540-4012
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-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Monday, August 31, 2015 1:43 PM
To: 'TechNet E-Mail Forum'; Richard Krug
Subject: RE: [TN] Textured Solder?
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
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