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
73,
Josh W6XU
On 6/2/2016 10:25 AM, Don Wilhelm wrote:
That "rule" still applies - if less than 2 seconds, reduce the iron
temperature, if longer than 3 seconds, increase it.
A lot will depend on the size and heat mass of the soldering tip more
so than the recovery time of the iron. A quick recovery is fine, but
is not the whole story.
73,
Don W3FPR
On 6/2/2016 12:43 PM, Josh Fiden wrote:
I would respectfully disagree with this advice. It is dependent on
the type of iron you're using. The Hakko FX-951 behaves quite
different from the traditional temperature controlled stations. It
has very fast thermal recovery, so typical through hole pads will
flow in much less than 3 seconds, but not because the iron is too hot.
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