I have not used one of those irons yet, so I can't comment on those
statements.
What I can say for certainty is that the component lead and solder pad
must be heated sufficiently to allow the solder to flow onto both and
out to a very thin (almost invisible) edge.
There is more to soldering than just melting the solder - it has to flow
out onto both surfaces and adhere to both of them. If the flow does not
happen, you are just "pasting solder". I am certain that can happen
with any type of soldering iron.
The document that Josh referenced indicates that soldering may be done
at a lower temperature with these irons, and that is OK - know your
soldering tool and watch the solder flow as you work.
73,
Don W3FPR
On 6/2/2016 11:36 PM, Josh Fiden wrote:
Sorry, that simply is not true. You don't understand how these Metcal,
newer Hakko (and other) irons work. Our production facility produces
thousands of through-hole boards per month. After testing the newer
soldering stations we immediately started replacing conventional
Weller WTCPT and Hakko 936 irons because both time per joint is faster
and temperature is more consistent as you move to the next joint.
These newer designs intentionally use tips with low thermal mass, have
a fast control loop (rather than slow on/off cycling), and sense
temperature at the tip. Adjusting the iron temperature is normally not
required because the iron instantaneously provides more heat to
maintain the set temperature. If the rate is too slow, you would first
look at tip geometry to more efficiently transfer heat.
This document describes the functional difference between conventional
vs new irons.
http://www.eis-inc.com/Files/pdf/supplier_showcase_page_downloads/oki/Tech_Note_High_Throughput_With_SmarHeat.pdf
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