Inconsistent or Poor Hole Fill for the THT assembly

1: Solder has not fully filled the plated through hole here.

2: The solder has failed to wet the surface of the through-hole here.

3: The solder has not fully filled the plated through hole on the left.


4: One hole has filled; the other has not.


5: It is likely that this board failed to make contact with the wave.

6: The legend on this PCB has contaminated the top of the plated through holes.

7: An example of the “weak knee” effect.