chrisf
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| posted on 8/12/04 at 02:39 PM |
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Ali terminology help
I need some terminology help. When reading through the archives, I found that the aluminum used on the floor and sides is oftern refered to as
'hard' or 'half hard'. I looked through my aircraft supply books and could only find confusing references to these terms. Does
anyone know what 'hard / half hard' terms means in the numerical specification for ali? For example, does 'hard' refer to
6061-T6 and 'half hard' refer to 5052-H23? Or are you ali floor users using the 5052 series ali?
This is all a bit baffling to me, so any help is appreciated.
--Thanks, Chris
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Peteff
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| posted on 8/12/04 at 02:46 PM |
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I asked something similar a couple of weeks ago and came to the conclusion that it is 5052-H22 that I need.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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timf
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| posted on 8/12/04 at 03:08 PM |
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this might help some
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krlthms
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| posted on 8/12/04 at 06:09 PM |
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quote:
Originally posted by timf
this might help some
Tim,
I keep waiting for your avatar to have an "accident" and bounce out of her boob tube, but I must get back to work now. You know now every
thing ford must be named starting with an "F", so wat's 'er name? 
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Aloupol
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| posted on 8/12/04 at 06:35 PM |
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T means it's tempered, O means no temper, so very poor strenght (you can fold a 300x100x3 mm sheet in hands) and W means fresh temper.
W is an metastable condition, it's nearly as mild as O but after a few hours at room t° it becomes T. To keep the W condition you have to store
it at -25°C.
The number after the T letter tells about the parameters of the maturation process.
The four digit number is the ISO spec who tells about the composition. There are several families, the family is showed by the first digit:
2-family (2024 for an example, as known as Dural) are easy to form at O or W condition, not weldable, quite uneasy to form at T condition, but mill is
possible in all conditions. The mechanical properties are very high.
7-family (7075 for an example, often used in mechanical parts) are more easy to mill and a bit less strong, the forming is more difficult but weld is
possible.
6-family are weldable and easy to form but with lower mechanical properties.
I don't remember the number of the cast-purpose family.
[Edited on 8/12/04 by Aloupol]
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chrisf
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| posted on 8/12/04 at 07:21 PM |
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So which is appropriate
Thanks for all the help! However one more question:
What numerical grade is appropriate for the floor?? Is it the 5000 series such as Pete suggest? What about the sides? The same?
--Thanks again, Chris
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Aloupol
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| posted on 8/12/04 at 09:05 PM |
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I think the grade itself maters few. If the stuff is tempered it will be strong enough.
2024 T42 or T3, 7075 or 6065 T something are the most comon I think.
This if you don't plan to weld. If you want to weld ban the 2024 and other 2XXX.
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