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Posted by Steve Scott on December 26, 2006, 10:01 pm
I'll second that. Use some silver braze with N2 and oxy-acetylene and
a #2 tip. Practice a bit on some scrap. It's not that hard.
Remember you're not trying to sweat it in like solder.
The only thing I would differ from what Jake's suggesting is I like to
pressurize the system with N2 after brazing. You'll find an
occasional leak that won't show up when pulling a vacuum. Plus if you
do have a leak you're not pulling air and moisture in.
>henny wrote:
>> You all seem to be split as to which method is easier to learn and
>> more forgiving.
>>
>> I do have Nitrogen so I'm not worried about oxidation. I also have
>> oxy/acet.tanks and equipment but the thought of using a #2 tip on soft
>> thin copper makes me a little nervous. (my welding skills aren't that
>> great so I doubt my brazing skills will be much better).
>>
>> I think I'll start my practice sessions using SilPhos 15 and a small
>> rosebud or turbo torch.
>>
>> Once again I'm simply looking for the method that's most forgiving to
>> a novice for a one time job and that can be readily learned via a few
>> practice sessions. I have no intentions of doing this for a living.
>>
>> Thanks for the responses.
>>
>>
>
>Henny,
>
>I learned a great deal from the people here on how to do this properly.
>Most of it you can probably Google up..
>
>As for advice... Noone's worked for me best. If you've used oxy/acet at
>all it's a much better heat source, IMO.
>
>Doing a closed system. ALWAYS purge with Nitrogen. Depending on the line
>size, I've successfully used 5-15 psi continuously during your job. Pull
>a Schrader core out and let the gas vent immediately down-stream.
>
>Once done, purge the system for a while and then pull it into a vacuum
>right away. Leave the system alone for a while and make certain the
>vacuum holds.
>
>Whatever the gas or liquid in a closed system... do not let things like
>AIR infiltrate. Whether it's a pump or compressor, it can cause bad
>problems.
>
>Charge the gas or liquid directly into the highest possible vacuum the
>system will achieve. This applies to water, oil-hydraulic and gas/liquid
>HVAC systems all the same.
>
>Some of the guys here might disagree with me here... but it's what
>should be good practice for learning.
>
>Jake
>
--
Time flies when you don't know what
you're doing.
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