Welded CVN properties of 5456 aluminum 1

[Ibreakstuffdigitally]

I'm looking for a good reference which would give me properties of 5456 H321 or H116 aluminum in 1/4-1/2" plate, as welded with a 5556 wire.

I've found allowable values in the ABS handbook, which gives yield, tensile and shear strength, but I'm missing any kind of charpy v-notch toughness information. I've tried AWS 1.2 and 2.1, as well as a weld wire manufacturer, but while they were helpful in their way, they didn't have what I needed.

We're going to be qualifying a weld proceedure, eventually, but I'd really appreciate a place to start.

If anyone's familiar with a good text, reference or code, I'd love to know.

Thanks!

 

[CoryPad]

Charpy v-notch impact testing of aluminium alloys has not been published widely. Part of the reason is that aluminium alloys are not strain-rate sensitive to the degree that steel is. You will need to come up with your own requirements, which could include using CVN testing.

 

[boo1]

"Aluminum Construction Manual", Section 3 "Engineering Data for Aluminum Structures", The Aluminum Association 5th ed Dec 1986, page 15 lists:
5456-H116,H321 sheet and plate 0.188-1.500 to 5456-H116,H321 sheet and plate 0.188-1.500 with ER5556 filler

Ftuw=42 ksi
Ftyw=26 ksi
Fcyw=24 ksi
Fsuw=25 ksi
Fsyw=15 ksi
Fbuw=84 ksi

 

[metengr]

Why are you even worried about notch toughness for this alloy???? There is no ductile to brittle transition, like steel.

 

[cloa]

ductile-brittle transition is temperature effect. Even ductile metals can crack if you put enough stress intensification (combination stress field and crack geometry). Aluminium alloys are generally less tough than steel.

 

[metengr]

Agreed, facture toughness will generally be lower for aluminum and alloys of aluminum than steel, given similar service temperature. Actually, lets be frank, fracture toughness is really what should be evaluated, and not CVN impact energy, if issues like strain rate and service temperature are irrelevant for aluminum alloys.

So, CVN impact testing is really not going to provide much in the way of fracture toughness behavior. There are no correlations for CVN to KI_c for aluminum alloys. There are published values for toughness properties, and this is what should be investigated, if anything.

 

[Ibreakstuffdigitally]

Thanks for the input all.

I should have mentioned a bit more about the context.

Strain rate is very important for the load case I'm considering, at least as far as the steel components are concerned. Everything's basically over in less than 50 ms in a ~40Hz system, and the primary load pulse is 15ms or so.

It doesn't seem like this would be unimportant.

 

[Ibreakstuffdigitally]

After talking with a few more people, my thought is to require that the weld sample must have a minimum 14% elongation, and that 80% or greater of the CVN failure surface must be ductile.

Has anyone seen anything like that in a requirement or code before?

Thanks again

 

[TVP]

Yes.