Electronics > Projects, Designs, and Technical Stuff

Vapour phase Soldering

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mrpackethead:
While everyone is converting toasters for DIY reflow, this guy

http://bubble.wservices.ch/index.php/DIY_Vapor_Phase_Reflow

converted a deep fryer to do vapour phase soldering.  That sir i thought was very clever, in deed.  Mechanically this would be really the easiest conversion that you could imagine.

I'm curious however ,  how you handled double sided componentry?

george graves:
Call me a noob....but how does this work?  Then I hear vapor, I assume a phase change - like liquid to gas.

If this is just re-flowing a board in deep-fryer, that's not that interesting.

jeremy:
This is from memory, so it could be completely wrong :P

You have a special (and expensive, usually fluorine based) fluid which has a boiling point above soldering temperature. You turn it into a gas with heat, and then it condenses on things that are colder than the gas (aka your PCB) and heat it up slowly. Thus you will eventually transfer all of the heat into the PCB and the solder will melt. The interesting thing is that the heating is slower than IR and the vapour will spread under things like BGAs etc so you are supposed to get much better yields for less tuning.

Also, from looking at this page he hasn't actually done anything yet? other than select a deep fryer.

mikeselectricstuff:
Vapour phase is close to the "ideal" reflow soldering method, as the temperature is consistent and defined by the boiling point of the fluid. You don't need to worry about overheating or board profiling.
One reason it's not common in industry it's hard to integrate into a continuous production line - it's usually used as a batch process, particularly for heat-sensitive components.
 
However the problem is that the fluid is expensive, and hard to buy in small quantities.

For double-sided, most parts will stay on due to surface tension of the solder. Larger parts may need glue dots

mikeselectricstuff:

The other problem is there is only one manufacturer - Galden

AU$1850 for 5kg :
http://www.oritech.com.au/productDetail.aspx?productID=40254

Here's someone that sells small quantities :
http://www.electronic-thingks.de/en/electronic-products/soldering-accessory/galden-ls-230.html

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