[sdiy] problematic sh101

[Richard Wentk]

At 00:31 08/11/2004 +0100, Senso wrote:
>>At 09:09 PM 11/6/2004 -0800, harrybissell wrote:
>>       This old timer agrees...more heat is a good thing (please notice I 
>> said heat, not higher temperature).  Even back before I started using 
>> temperature controlled irons, I had an Ungar 47 watt soldering 
>> pencil.  It was kind of a pain in that not only did it have a lot of 
>> heat, but it also attained a rather high temperature...keeping it clean 
>> was a problem.  Still, being able to make a solder joint almost 
>> instantly is definitely a good thing.
>
>Maybe a stupid question, maybe I miss the right diy background, but how do 
>I get more heat without raising the temperature?
>Cold fusion?

Shhhhh! Don't alert the authorities...

In fact what happens is you get a much bigger pulse of heat, which - 
because of thermal inertia - is confined to a much smaller area. Which 
means you can apply the iron for a much shorter period.

This is good because you're less likely to wreck the board under the 
components, and also the components themselves. It can also mean you don't 
get to get to breathe as many fumes.

But there is a limiting case, which involves applying kilowatts of power to 
SMDs via some industrial welding gear. This typically fuses the components 
into a molten mass, and is usually considered more of a bad thing than a 
good one. (At least unless you're into bizarre non-functional electronic 
sculpture in which case - as we know - anything goes.)

Richard