http://www.mlevel3.com/BCIT/heat
treat.htm) recommends "Cool at uncontrolled rate in air" to anneal "Cold
Worked Materials" of 6061 alloy. For "Heat Treated Material" slowly cooling
at "28°C per hour from the annealing temp down to 260°C. Subsequent rate is
unimportant." is recommended for 6061 alloy.
I don't have anything else to contribute to this thread.
Thanks for your comments,
Ed
On Wed, 3 Oct 2012 07:06:16 -0700, Alistair Bell <albell@SHAW.CA> wrote:
>I guess we we will just have to agree to disagree. I would heat the copper
or Aluminium washers and quench them. Well, even Bob Hoover agrees
(http://bobhooversblog.blogspot.ca/2006/11/vw-annealing-copper-washers.html)
>
> I'm going to be annealing sections of some 6061 1" pipe, either today or
tomorrow, so that I can bend parts of it. A bit different than washers, very
unwieldy for quenching, I'll see how it goes.
>
>cheers
>
>alistair
>
>
>On 2012-10-03, at 5:36 AM, Ed wrote:
>
>> Alistair,
>>
>> Thanks for your comments.
>>
>> However, quenching is not required for annealing of these metals. Copper
>> and aluminum may be annealed by heating and then either quenching OR cooling
>> slowly. The behavior of some aluminum alloys may differ slightly according
>> to their composition, but in general, this procedure applies.
>>
>> http://en.wikipedia.org/wiki/Annealing_(metallurgy)
>> http://www.fournierenterprises.com/Annealing.pdf
>>
>>
>> I still stand by my recommendation that copper and aluminum sealing washers
>> should be replaced but, if necessary, their lifetime may be extended by the
>> following procedure:
>>
>> "In an emergency you can remove the sealing washers and heat them with a
>> propane torch, allowing them to cool without quenching."
>>
>> Regards,
>> Ed
>>
>>
>>
>> On Tue, 2 Oct 2012 18:10:30 -0700, Alistair Bell <albell@SHAW.CA> wrote:
>>
>>> i'd agree that you could anneal to regain softness of washer but disagree,
>> Ed, in your annealing method for aluminum and copper. Both those metals
>> anneal by quenching, not slow cool.
>>>
>>> alistair
>>>
>>>
>>>
>>>
>>> On 2012-10-02, at 2:46 PM, Ed wrote:
>>>
>>>> The sealing washers are probably work hardened and are no longer soft
enough
>>>> to make a good seal. Replace them as they are ideally one use items.
>>>> That's why you get a new one for the oil plug when you buy an oil filter.
>>>> In an emergency you can remove the sealing washers and heat them with a
>>>> propane torch, allowing them to cool without quenching. This will restore
>>>> the softness of both aluminum and copper sealing washers and allow them to
>>>> seal without excessive force.
>>>>
>>>> Ed
>>>>
>>>>
>>>> On Tue, 2 Oct 2012 16:02:38 -0500, JRodgers <jrodgers113@GMAIL.COM> wrote:
>>>>
>>>>> PS pump is leaking at the washer where the hollow bolt passes through
>>>>> the banjo fitting on the pressure side. I made sure the bolt IS NOT
>>>>> loose. So I need to do something. Any suggestions?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> John