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Vapour phase Soldering

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mrpackethead:

--- Quote from: Kjelt on January 23, 2015, 09:00:44 am ---Thinking about the heating element/system.

If you look at pro kitchen equipment, they only place a heater under the stainless steel container for temperatures up to 90 degrees C (like warmwater baths, bain marie).
Above those temperatures like in frying equipment (180 to 200 degrees C typically) they place the heating element inside the stainless steel container making contact with the fluid.

So would it be allowed for this vapour chemical to be in direct contact with the heating element or would that not be advised?

--- End quote ---

My concern with having the heater in the tank is not to do with contaimination, its to do with the amount of fluid you'll need in your tank to cover the element.  In my home deep fryer, i'll need 3.5l minimum to cover it.  and when we heat it, and evaporate it, we'll have even less covering the elements.  they will just overheat.     That machine that we were looking at before claims it will work with just 1 quart ( ~1 litre ).     By having external heating it will be much easer to avoid this issue.

Deepfryer is off the list of suitable things to use..  I'm also thinking we want to make it a *lot* deeper than your average deep fryer.

So, excuse the very bad pun.

"Deep fryer is for making chips, not soldering them"

Kjelt:

--- Quote ---Deepfryer is off the list of suitable things to use
--- End quote ---
It was never my intention to advise to use a deepfryer, I was merely saying that if you look at pro kitchen equipment that heats a bath above 100oC they do not put the heating element below and against the bottom of a stainless steel container anymore. Now there has to be some reason for that?
I can think for instance that it is not safe to use a heater that way with such high temperatures since it will radiate in all directions so the whole area will have that temperature so the electrical wiring etc has to withstand that temperature. So heating from below with a standard heating element is probably not an option. Thats all I was trying to say.
Than I would indeed rather use the induction method FreeElectron has given.
You need a temperature of 230oC for the leaded solderpaste and a bit above that for the unleaded, so these are quite high fluid temperatures.

jeremy:
You're right Kjelt, but I think I would rather have something made of pyrex so I can see inside. I'm currently liking the idea of using induction and putting a chunk of iron inside the vessel.

edit: Although the recommended reflow temperature for SN100C with vapour phase is 230C - 245C from here

free_electron:

--- Quote from: jeremy on January 22, 2015, 08:53:12 am ---free_electron: nice pic. what did you draw it in?

--- End quote ---
Altium silkscreen layer  >:D

free_electron:

--- Quote from: mrpackethead on January 23, 2015, 09:36:13 am ---
--- Quote from: Kjelt on January 23, 2015, 09:00:44 am ---Thinking about the heating element/system.

If you look at pro kitchen equipment, they only place a heater under the stainless steel container for temperatures up to 90 degrees C (like warmwater baths, bain marie).
Above those temperatures like in frying equipment (180 to 200 degrees C typically) they place the heating element inside the stainless steel container making contact with the fluid.

So would it be allowed for this vapour chemical to be in direct contact with the heating element or would that not be advised?

--- End quote ---

My concern with having the heater in the tank is not to do with contaimination, its to do with the amount of fluid you'll need in your tank to cover the element.  In my home deep fryer, i'll need 3.5l minimum to cover it.  and when we heat it, and evaporate it, we'll have even less covering the elements.  they will just overheat.     That machine that we were looking at before claims it will work with just 1 quart ( ~1 litre ).     By having external heating it will be much easer to avoid this issue.

Deepfryer is off the list of suitable things to use..  I'm also thinking we want to make it a *lot* deeper than your average deep fryer.

So, excuse the very bad pun.

"Deep fryer is for making chips, not soldering them"

--- End quote ---

like i said. get a turkey fryer. those are really deep.
throw a iron metal plate inside the fryer at the bottom. ( turkey fryers are aluminium ... )
put fryer on induction heater.

should work ...

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