Electronics > Projects, Designs, and Technical Stuff
Vapour phase Soldering
SeanB:
Like Vincent said use an external heater. Either a simple solid plate that you hard solder to the bottom of the chamber, and insulate with a lot of high temperature insulation, or use the Free electron style of an induction heater coil coupling energy directly into the base plate.
ajb:
--- Quote from: jeremy on January 22, 2015, 11:06:08 am ---
--- 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!
--- End quote ---
If you look at the video for the VP6000 (), it looks like the process is this:
- Load carrier into entry chamber.
- Transfer carrier into process chamber.
- Lower carrier into soldering zone.
- Lift carrier out of soldering zone.
- Activate drying heat and vacuum.
- Transfer carrier into entry chamber.
- Cool.
- Unload.
The drying heat appears to be a halogen tube lamp. Presumably the drying heat also keeps the solder molten long enough for the vacuum to properly degas it, and also controls the cooling speed to avoid quenching. The vacuum system (which is very nicely labeled! Too bad more of the labels aren't legible in even the HD video) appears to use filters to recover the process fluid. I'm kind of surprised they didn't go for a cold trap, since the system already has a water cooling loop, but I guess the filters are effective enough.
gxti:
--- Quote from: langwadt on January 20, 2015, 08:39:03 pm ---no isolation of the wires here: http://www.ibrtses.com/projects/vapourphasesoldering.html
--- End quote ---
I like the "bigass beaker" approach. Instead of immersion heating, throw a steel puck in the bottom and stick the whole thing on an induction heater. Maybe even find a metal with a lower curie point for the puck so it can't overheat if it "runs dry" -- once it hits that point, it should just stop being heated by the magnetic field.
jeremy:
--- Quote from: mrpackethead on January 22, 2015, 06:37:19 pm ---...
Its a bucket with a lifter in it!!
I'm seeing a project coming up here.
--- End quote ---
you and me both. now to find some of this pesky galden...
IconicPCB:
Yes.. I thought Wenesco had a good approach in their batch oven.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version