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Posted by KDV on May 26, 2006, 10:45 am
 
Knip


Antispam,
Today I have tryed to solder alu fins on the copper tubes. The alu fins are
so thin (0.6 mm) and the copper tube is mutch thicker (1 mm), so what
happend everytimes .... the alu fin melts almost or completely. I have done
this with a butane/propane burner. So the alu fins are faster hot then the
copper tube, because the fin is thin en the copper tube is thick. Maybe with
a very fine burner that hits only the 8 mm copper tube and spread his heat
to the fins but this is work for very fine specialist I think!
You asked if you can solder alu and copper with engine oil as flux. I have
tryed this also. Besides that the oil is burning and the specific burning
oil smell nothings happens! I have ventilated the hole garage, it was not a
good idea!
Better make a groove in the aluminium plates to clic in the copper tube.
Make a frame in Iron, take one iron beam with 2 springs, in between an oil
jack. Now you can press manuely with tho oil jack a groove in the aluminium
plate. You can buy this in Belgium for ? 500 oil jack of 20 tons included.
________________
I      /      I         /     I
I      /      I         /     I
I      /     I I        /     I
I ___/__I_I____/__I
I ______________I
I                             I
I_______________I
I_______________I

I read also that with high temperatures (making steam) the antivries wil be
corrosife! I think I have read this on the site of Gary  www.buiditsolar.com
I don't know were exatly.

Greetz
--
Kris De Voecht
Homepage: www.devoecht.com



Posted by Duane C. Johnson on May 26, 2006, 5:40 pm
 
Hi KDV;


 >>>Hi antispam,

 >>>I'm working on solar collectors too. Collectors on
 >>>the principle as you. You can see the pictures on my
 >>>site. I'm working on translating it all in
 >>>English but it is not finished yet. See
 >>>http://users.telenet.be/hagim/zonne_energie/build%20your%20own%20solar%20water%20collector.htm

 >>Nice work Chris, I especially like the copper fins you
 >>have made for the collector pipes. The overall finish
 >>and engineering quality is very high. Have you tried
 >>soldering Aluminum fins to copper pipes, does it work?

 >>From your workshop it looks like you will be making
 >>these on a commercial basis, do you need any control
 >>electronics designed? I design PIC based systems for
 >>control electronics.

 >>mark@markXscotford.com (remove the X to reply)

 > Today I have tried to solder aluminum fins on the copper
 > tubes. The aluminum fins are so thin (0.6 mm) and the
 > copper tube is much thicker (1 mm), so what happened
 > every time the aluminum fin melts almost or completely.
 > I have done this with a butane/propane burner. So the
 > aluminum fins are faster hot then the copper tube,
 > because the fin is thin en the copper tube is thick.
 > Maybe with a very fine burner that hits only the 8 mm
 > copper tube and spread his heat to the fins but this is
 > work for very fine specialist I think!
 > You asked if you can solder aluminum and copper with
 > engine oil as flux. I have tried this also. Besides that
 > the oil is burning and the specific burning oil smell
 > nothings happens! I have ventilated the hole garage, it
 > was not a good idea!

That's because you were using a torch. This doesn't work.
The proper way is to use a heavy soldering iron. Along
with the oil you must rub the surface of the aluminum
to scrape away the aluminum oxide so the solder will
stick. Don't use solder with any flux.

Soldering is not easy to do with the slotted aluminum
sheet. It is much easier to use RTV silicone caulk.

 > Better make a groove in the aluminum plates to click
 > in the copper tube. Make a frame in Iron, take one iron
 > beam with 2 springs, in between an oil jack. Now you
 > can press manually with the oil jack a groove in the
 > aluminum plate. You can buy this in Belgium for?
 > 500 oil jack of 20 tons included.

View in New Times Roman
 > ________________
 > I      /      I         /     I
 > I      /      I         /     I
 > I      /     I I        /     I
 > I ___/__I_I____/__I
 > I ______________I
 > I                             I
 > I_______________I
 > I_______________I

View in Courier New
-----------------------------
I     /       I       /     I
I     /       I       /     I
I     /      I I      /     I
I     /     I   I     /     I
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 > I read also that with high temperatures (making
 > steam) the antifreeze will be corrosive! I think
 > I have read this on the site of Gary
 > http://www.buiditsolar.com
 > I don't know were exactly.

Here is another fixture to press the groove into
the sheet:
http://www.redrok.com/misc1.htm#wrappingjig

 > Greetz

Duane

--
     Home of the $5 Solar Tracker      Receiver
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Posted by Solar Flare on May 26, 2006, 10:04 pm
 Lead/tin solder does not adhere to aluminum. period.



Posted by Duane C. Johnson on May 27, 2006, 10:40 am
 Hi Solar;


 > Lead/tin solder does not adhere to aluminum.
 > period.

But I have done it many times.
The trick is to scrape away the aluminum oxide
and keep it away with the oil.
Without the oxide aluminum is just like any
other solder able metal.

Duane.

--
     Home of the $5 Solar Tracker      Receiver
    http://www.redrok.com/led3xassm.htm       [*]
   Powered by             \  \     \        //|
  Thermonuclear   Solar Energy from the Sun / |
Energy (the SUN)           \  \     \  /  /  |
Red Rock Energy             \  \     /   /   |
Duane C. Johnson   Designer  \  \  /  \ /    |
1825 Florence St  Heliostat,Control,& Mounts |
White Bear Lake, Minnesota    === \   / \    |
USA      55110-3364                ===   \   |
(651)426-4766        use Courier New Font \  |
redrok@redrok.com     (my email: address)  \ |
http://www.redrok.com   (Web site)          ===

Posted by Solar Flare on May 30, 2006, 2:53 am
 I doubt it.



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