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Vapour phase Soldering

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SeanB:
Cooling is by passing the cold water ( relative to the Galden) through the tank in a stainless steel tube, thus condensing the vapour, and the cold water is boiled and vented, the boiling water absorbing the heat in the hot Galden so that at the end of the cooling cycle it will be below its boiling point, and at around 80C or so. The water never contacts the Galden, it is only used in a heat exchanger to cool it.

Chris Jones:

--- Quote from: Kjelt on March 22, 2015, 11:17:52 am ---So as I now understand it this Quicky unit just adds distilled water to the Galden to cool it off?
So the students on that youtube experiment weren,t so stupid after all.
I am amazed I would have thought of some more elegant way of coolong like running water through tubes in the fluid as lets say a destillation column in chemistry works. So if the water is added in the cooling stage what hapoens to all the steam and how does the unit prevent the steam for teansporting the Galden vapour along with it?

--- End quote ---

As SeanB said, (and you suggested would be a good idea) the water is put inside a stainless steel pipe, and that pipe is in the Galden, but water does not touch the Galden. It doesn't even make loud boiling noises or let visible steam out through the drain pipe when it does the cooling part of the cycle so I wonder if they have some trick to make it gently add the water.

There is also a rectangular tube section that forms a sort of ledge around the walls of the tank about 2/3rd way up, and I think that might be water cooled as well, to reduce vapour reaching the top of the chamber. Perhaps that rectangular tube around the tank is the reservoir for the water, but I don't know yet.

SeanB:
The ledge is a condensate drip tray, it simply adds a large surface at a point, and yes, there is a cooling water pipe behind it to circulate the cooling water when it is desired to cool the chamber. The vapour cools on it, forms a layer of liquid and then the ledge collects all of it and allows it to trickle down the wall in a corner back to the bulk liquid below.

luky315:
I tried it with a simple setup (30€ induction cooker, cooking pot with glass cover, Fluke 179 thermocouple) and it worked fine, without complicated cooling systems. The loss of Galden 230 was negligible.

tautech:

--- Quote from: luky315 on April 22, 2015, 11:30:22 am ---I tried it with a simple setup (30€ induction cooker, cooking pot with glass cover, Fluke 179 thermocouple) and it worked fine, without complicated cooling systems. The loss of Galden 230 was negligible.

--- End quote ---
Nice job.  :-+

Care to share in more detail?
Temp?
Solder type?
Total time?
M3 capacity of your pot?
What height is your basket?
Galden used (ml)?, Galden lost?
Can you easily observe the reflow happening?

We all hope it is that simple.  :-+

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