http://shufti.wordpress.com/2012/06/24/vanagon-syncro-bash-plate-project-fin
ished/
alistair
On 2012-10-03, at 8:07 AM, Ed wrote:
> Alistair,
>
> I don't wish to drag this out longer but my comments were only for
> emergency recovery of some very low stressed sealing washers, not
> bending larger aluminum pipe. I make no suggestions on how to handle
> larger pieces of aluminum.
>
> I would, however, like to point out that at least one internet source
> of unknown reliability ("Annealing" section of
> 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