Electronics > Projects, Designs, and Technical Stuff
Vapour phase Soldering
tautech:
--- Quote from: zapta on February 02, 2015, 02:02:20 am ---Can't this type of reflow be achieved using less expensive liquids?
--- End quote ---
We'd all like to know that too, but how they might behave at elevated temperatures is the unknown. :-//
Contamination of the reflow MUST be of primary concern would you not think?
Then there is the interaction with any componentry also to consider.
Inert, non-toxic tailored reflow fluids seem the best option to me.
IanB:
--- Quote from: zapta on February 02, 2015, 02:02:20 am ---Can't this type of reflow be achieved using less expensive liquids?
--- End quote ---
I would look at a convection oven using circulating hot air. Air is cheap and easily obtained, and the circulation currents lead to even heating and good heat transfer.
A possible design could include an electric hot air gun as a heat source and a triac dimmer for temperature control. The hot air gun comes with its own fan, so you only need to put together a suitable insulated enclosure with a window and some suitable baffles for good circulation. The temperature sensor could be placed in the exhaust port and measure the air temperature leaving the oven.
tautech:
--- Quote from: IanB on February 02, 2015, 04:15:27 am ---
--- Quote from: zapta on February 02, 2015, 02:02:20 am ---Can't this type of reflow be achieved using less expensive liquids?
--- End quote ---
I would look at a convection oven using circulating hot air. Air is cheap and easily obtained, and the circulation currents lead to even heating and good heat transfer.
A possible design could include an electric hot air gun as a heat source and a triac dimmer for temperature control. The hot air gun comes with its own fan, so you only need to put together a suitable insulated enclosure with a window and some suitable baffles for good circulation. The temperature sensor could be placed in the exhaust port and measure the air temperature leaving the oven.
--- End quote ---
Sorry Ian, but have you read the whole thread?
One of the benefits of VP is the inert atmosphere of the vapour, the main reason to investigate this technology.
IanB:
--- Quote from: tautech on February 02, 2015, 04:53:10 am ---Sorry Ian, but have you read the whole thread?
One of the benefits of VP is the inert atmosphere of the vapour, the main reason to investigate this technology.
--- End quote ---
I understand that, but I have not seen the argument that the inert atmosphere is important. Is it common to use an inert atmosphere in industrial reflow soldering processes today? If soldering today was done in an argon atmosphere I would see the point, but I'm not sure that is the case. It's my understanding that the solder flux forms a protective film between the air and the molten solder and this is a sufficient barrier to keep oxygen away.
helius:
using a nitrogen blanket in an inline reflow machine seems fairly common.
There seem to be some untrue rumors about it going around, though:
http://blogs.indium.com/blog/semiconductor-and-power-semi-assembly/dispelling-10-myths-about-nitrogen-reflow-part-i
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