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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Pitted / Stretched Appearance on Fine Pitch Components.

JSTARKEY

#29702

Pitted / Stretched Appearance on Fine Pitch Components. | 27 July, 2004

We have recently encountered a problem that we haven't seen before: The solder joint appears to be wetting ok and the solder is re-flowing but the appearance of the solder after re-flow is pitted. Using Kester 531, humidity around 41% temperature around 75 deg. Any ideas as to what might be causing this? Re-flow temp is 260 c.

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#29746

Pitted / Stretched Appearance on Fine Pitch Components. | 29 July, 2004

This sounds like a "perfectly fine" no-lead solder connection. What the composition of: * Solder alloy? * Solderability protection on components?

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HeatShield Gel- thermal PCB shield during reflow