Electronics > Projects, Designs, and Technical Stuff

Vapour phase Soldering

<< < (32/48) > >>

IconicPCB:
About 20 years ago  I sold the first nitrogen atmosphere wave soldering machine in Australia.

You could see the solder pot surface remain dross free as the oxygen level inside the process tunnel went down. Minimum flux was required to get good solder joints.

In fact the difference in density between flux and flux solvent was imperceptible attesting to the low solids flux.

jeremy:

--- Quote from: IconicPCB on February 02, 2015, 12:47:24 am ---Is stainless steel really a requirement?

I mean if fluid is inert it ought not contribute to corrosion process in any way.

Why does it need to be stainless steel why not ordinary galvanized sheet metal ?

--- End quote ---

I don't think so. Most cooking ovens I have seen are not made of stainless, so I don't see why galvanized metal would be a problem. Much easier to weld shut too.

Zapta: I think at higher pressures you will change the melting point of the solder. Also, you could possibly force the fluid into the fr4 or other parts.

Kjelt:
Actually Ian has a fairly good point I think.
If you have a large vessel with at the bottom a controlled oven heated 230
--- Quote ---o
--- End quote ---
C area filled with Argon gass (which is heavier than air so will stay at the bottom) it would still be a matter of slowly lowering the pcb inside the area till the temp profile is correct.
Only problem I see is that hot air rises up so you have less controlled heating profile unless you let the pcb slide in from aside instead of above but then you have chance of loosing Argon.
We need a mechanical engineer here to sort this out  :)

tautech:

--- Quote from: Kjelt on February 02, 2015, 06:52:33 pm ---Actually Ian has a fairly good point I think.
If you have a large vessel with at the bottom a controlled oven heated 230
--- Quote ---o
--- End quote ---
C area filled with Argon gass (which is heavier than air so will stay at the bottom) it would still be a matter of slowly lowering the pcb inside the area till the temp profile is correct.
Only problem I see is that hot air rises up so you have less controlled heating profile unless you let the pcb slide in from aside instead of above but then you have chance of loosing Argon.
We need a mechanical engineer here to sort this out  :)

--- End quote ---
For a hobbyist to buy and keep an Argon supply on hand will cost more than the litre of Galden.

mikeselectricstuff:

--- Quote from: tautech on February 02, 2015, 07:35:13 pm ---For a hobbyist to buy and keep an Argon supply on hand will cost more than the litre of Galden.

--- End quote ---
You can get disposable cylinders of argon for welding - about GBP17 in the UK

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod