This is Pradeep from Micropack Limited, India, fabricators of high layer count MLB's

Few of our customers are following hand soldering of multilayer PCB's for both through hole components as well as SMD's. Couple of stray cases of failure of the PTH has been reported and the analysis shows this has happened only for hand soldered boards.

Few of my queries are
1.    The separation is mostly on the adjacent layer to the outer layers.
2.    Why is that it is happening only for hand soldered boards
3.    Somebody can help us with some reference articles on the advantages and disadvantages of both hand soldering as well as machine soldering.
4.    The customer keeps telling that the soldering operator is trained and with 'years of experience' and can not make a mistake!
        He keeps soldering the the pads one by one, evenif the pads are adjacent ones. We feel by doing so, the area is getting                 heated up to higher levels which can be avoided by soldering the pads which are not close sequentially


Rgds

Pradeep
Micropack Limited

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