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I'd like to improve my copper brazing technique. (refrigerant lines)

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I'd like to improve my copper brazing technique. (refrigerant lines) james 02-05-2007
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Posted by james on February 5, 2007, 11:05 am
I would like some tips to improve my copper pipe/copper fitting
brazing technique. I practiced yesterday afternoon on some scrap 3/4"
copper pipe and fittings and my joints are leak free but there's room
for continuous improvement. I'm not producing nice consistent fillets
even though the joints are filled.

I'm using oxy/acet, #2 tip, about 2-3 PSI, neutral to slightly
reducing flame and Sil Fos 15.

Is this configuration about right for 3/4" connections?

Do you like to start at the bottom of the joint and work your way to
the top or vice versa.

I know Sil Fos on copper to copper doesn't require a flux. However
can flux be used? (ie in order to better gauge temperature of the
joint). Will flux help achieve better joints?

Do you like to aim the torch flame towards the pipe end or the fitting
end as your sweeping back and forth? Or do you aim it perpendicular to
the axis of the pipe? Or do you like to heat the joint by going up and
down or figure 8?.

Do you actually touch to inner cone of the flame tip to the fitting or
do you back it away a little bit to reduce any chance of burn thru?

I'm using Sil Fos 15 ribbon filler. Would round work better? What
diameter?

TIA.


Posted by -zero on February 5, 2007, 12:34 pm

>I would like some tips to improve my copper pipe/copper fitting
> brazing technique.

This will cover most questions.
http://www.copper.org/resources/pub_list/pdf/soldering_brazing_ads.pdf

The other questions are kinda like... "What does it feel
like to eat Ice cream?" 10 minutes of hands-on instruction with
someone who does it everyday would be invaluable.

-zero



Posted by james on February 5, 2007, 7:12 pm
>
>
> >I would like some tips to improve my copper pipe/copper fitting
> > brazing technique.
>
> This will cover most
questions.http://www.copper.org/resources/pub_list/pdf/soldering_brazing_ads.pdf
>
> The other questions are kinda like... "What does it feel
> like to eat Ice cream?" 10 minutes of hands-on instruction with
> someone who does it everyday would be invaluable.
>
> -zero


Thanks. That's a great link!.

What size torch tip would you use for 7/8" copper tubing and Sil Fos
15. The objective for brazing copper suggests you bring in lots of
heat, do your brazing quickly and get out. Is a # 2 Victor tip too
small?? Is so what's the optimum tip size for Oxy/Acet brazing of
refrigeration lines?


Posted by Oscar_Lives on February 5, 2007, 7:50 pm

>>
>>
>> >I would like some tips to improve my copper pipe/copper fitting
>> > brazing technique.
>>
>> This will cover most
>>
questions.http://www.copper.org/resources/pub_list/pdf/soldering_brazing_ads.pdf
>>
>> The other questions are kinda like... "What does it feel
>> like to eat Ice cream?" 10 minutes of hands-on instruction with
>> someone who does it everyday would be invaluable.
>>
>> -zero
>
>
> Thanks. That's a great link!.
>
> What size torch tip would you use for 7/8" copper tubing and Sil Fos
> 15. The objective for brazing copper suggests you bring in lots of
> heat, do your brazing quickly and get out. Is a # 2 Victor tip too
> small?? Is so what's the optimum tip size for Oxy/Acet brazing of
> refrigeration lines?
>

It depends.



Posted by Howard on February 5, 2007, 8:50 pm
wrote:

>
>>>
>>>
>>> >I would like some tips to improve my copper pipe/copper fitting
>>> > brazing technique.
>>>
>>> This will cover most
>>>
questions.http://www.copper.org/resources/pub_list/pdf/soldering_brazing_ads.pdf
>>>
>>> The other questions are kinda like... "What does it feel
>>> like to eat Ice cream?" 10 minutes of hands-on instruction with
>>> someone who does it everyday would be invaluable.
>>>
>>> -zero
>>
>>
>> Thanks. That's a great link!.
>>
>> What size torch tip would you use for 7/8" copper tubing and Sil Fos
>> 15. The objective for brazing copper suggests you bring in lots of
>> heat, do your brazing quickly and get out. Is a # 2 Victor tip too
>> small?? Is so what's the optimum tip size for Oxy/Acet brazing of
>> refrigeration lines?
>>
>
>It depends.

A lot of good that does the OP!! If you don't know anything step
aside.



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