I have done that too, and that avoids the temperature shock. If the
specifications on allowable soldering temperatures and time are going to be
met, it is a little more critical. Look at the specified soldering profile
for most SMT parts and you will see what I am referring to.
As parts get more complex, a proper soldering profile gets more critical and
it also relates to long-term reliability and how much stress was put on the
parts.
There normally is a rather long temperature plateau to give the flux an
opportunity to work and then there is quick soldering phase.
Bertho
+++++++++++++++++++++++++++++++
From: DJ Delorie Sent: Friday, April 04, 2008 22:26
"Bertho Boman" <
boman01@... <mailto:boman01%40vinland.com> > writes:
> Placing an SMT board directly on a flat hotplate will likely create
> a severe thermal shock to the board and the components.
What I do is put the board on a cold hotplate, then turn it on. Mine
takes about three minutes to heat enough to melt solder, which seems
to work well for me.
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