Hello Technetters,

I need some advises. I have a  6- layers board. I try to wave solder it,
the solder 
at the ground point is not able to flow up to the top side of the board, in
fact, it
doesn't flow above 75%.

We have tried using a solder-iron and set to temperature to 450 deg. cel. and 
hopefully able to force the solder through the PTH. Too bad, it didn't work
anyway
and it in fact has caused some lifted pads.

We use full blow Nitrogeneous wave-solder machine, and the flux we use is 
only 1.2% solid content. And if the preheat temperature set to high, the flux 
gets degraded before it even reaches the wave..

I would like to know if anyone could advise me how wave-solder such a board
with a great heavy thermal mass.

Thanks in Advance..



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