Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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Solder Post reflow

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aj

#55413

Solder Post reflow | 8 July, 2008

Hi all,

I was carrying out some trials and the attached image is something that puzzled me .

What would be the cause of this ? is it excess volume ? poor wetting?

aj...

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#55420

Solder Post reflow | 8 July, 2008

Volume that appears to be caused by wetting. Now remember most solder pastes will not "flow" across an entire pad. It will only flow where it is printed.

In your pic, if the pad was covered and came out like this - it may be your pad. If it was printed off pad a little, then it is excess. Although you have to realize if a part were there, it would wick up the part lead.

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