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Ali terminology help
chrisf - 8/12/04 at 02:39 PM

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

Peteff - 8/12/04 at 02:46 PM

I asked something similar a couple of weeks ago and came to the conclusion that it is 5052-H22 that I need.

timf - 8/12/04 at 03:08 PM

this might help some

krlthms - 8/12/04 at 06:09 PM

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?

Aloupol - 8/12/04 at 06:35 PM

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]

chrisf - 8/12/04 at 07:21 PM

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

Aloupol - 8/12/04 at 09:05 PM

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.