Re: [ATM] soldering SMPs

["Bob May" <rmay@nethere.com>]

The flux is relaitively nonconductive - I' vve worked with
nanoamp analog devices where the flux does matter but for typical
digital and higher current analog stuff, it d0oesn't matter.  If
you feel the need, and I generally do just for the appearanbce of
the work, remove the flux.  If nothing else, it looks better.
As long as the solder looks bright silber and is shiney, you're
doing good with the solder work.
Hot air works alright but you need to glue down the parts exactly
in place after the solder paste, something not readily available
compared to finer solder, will do the job just fine.  Please note
that as the heat works its way into the board, the layers of the
board will tend to seperate and "measle" with air pockets between
the layers.  Needless to say, this is bad ass it tends to
seperate the thru holes and thus you lose the connectibvity of
the board, something that is pretty fatal to a board,  I tend to
stay away from the hot air gun for most of my work  for this
reason.  It is a very dynamic process and you have to stop
applyingh the heat after a very short while or the board starts
getting bad.
The berst is fine solder, plenty of flux and a small tip that
isn't long, long tips tend to not be able to deliver the heat to
the work and are more for soldering fine wires to parts like
transformers and so forth of the tiny size.
Also, don't try to move parts around with the soldering iron as
this tends more to delaminate the pads from the board and you're
again in big trouble.
Bob May
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