Electronics > Projects, Designs, and Technical Stuff
Vapour phase Soldering
jeremy:
--- Quote from: EdoNork on January 22, 2015, 11:00:29 am ---How do they use the vacuum?
If you apply vacuum the boiling point of liquid drops highly, so the temperature necesary for the soldering can't be reach.
--- End quote ---
If you look in the patent, it has a separate chamber which is pulled under a vacuum. So while the solder is still liquid, it the board moves from the vapour blanket to the chamber and the vacuum does its work. Cooling isn't really a problem, because it's a vacuum!
ElektroQuark:
So they remove gas bubbles and liquid from the board, avoiding gaps.
Cooling is important for the solder (Pb, Sn,etc), not for the soldering liquid, of course.
helius:
Asscon (related to siemens?)
--- End quote ---
They are both German; but I get the sense that they use all COTS PLC equipment, and Siemens is a big player in PLCs.
I haven't seen it mentioned here yet, but vapor phase is an oxygen-free process. As the board is lowered into the vapor cloud, the condensing liquid forms a film all over it and so there is no oxygen at the joint during reflow. Separate pre-heating is not needed because the ramp rate is controlled by the heat input to the liquid.
jeremy:
One last interesting patent: US 4523039 A - Method for forming perfluorocarbon ethers. Check out the number of patent references, mostly by Solvay.
Basically get a polyether, add fluorine and heat up like crazy. I think this one is best left to the experts...
mrpackethead:
The Wenesco Machine looks not too bad, and actually demonstrates how simple the system probably is. There is a lot of potential here to engineer a solution that is a lot more complex than it needs to be, i suspect.
Its a bucket with a lifter in it!!
I'm seeing a project coming up here. I'm thinking that it would be wise to start with building an experimental system. I had thought about using the deep fryer, but the issue is that the element will need to be completely covered, and that in itself will require a lot of the expensive juice. time to rethink the heating, just a little bit.
What seems apparent to me, is that a pretty decently tall system will be your friend here. I'm thinking you probably want a tank that is a minimum of 600-700mm deep.
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