Alloys 5052 and 5086 for automotive panels

[Kabous]

Researching 5052 I came upon this thread http://allmetalshaping.com/showthrea...highlight=5xxx specifically wanting to know the suitability of it for body panels and this quote:

Originally Posted by Joe Hartson

5086 alloy was developed as an alloy for auto bodies.

Looking at the properties of 5086, it has a Mg content of 3.5-4.5% and wondered if anybody had any experience with this alloy. Specifically about heat cracking in the hood area (high performance engine) because of the high Mg content? The presence of permanent vibration caused by the engine might exacerbate this.

The question came as a result of Lincoln's Aluminum GMAW Welding guide wherein they mentioned that "Al-Mg alloys with Mg content over 3% are unsuitable for service temperatures over 150°F (65°C) because they are susceptible to stress corrosion cracking at higher temperatures. This is true for filler alloys as well and should be taken into account in selecting filler alloys"

http://www.lincolnelectric.com/asset...56TM/c8100.pdf
p11

Anyone made body panels with these alloys especially near heat affected zones?

[crystallographic]

Originally Posted by Kabous

Researching 5052 I came upon this thread http://allmetalshaping.com/showthrea...highlight=5xxx specifically wanting to know the suitability of it for body panels and this quote:



Looking at the properties of 5086, it has a Mg content of 3.5-4.5% and wondered if anybody had any experience with this alloy. Specifically about heat cracking in the hood area (high performance engine) because of the high Mg content? The presence of permanent vibration caused by the engine might exacerbate this.

The question came as a result of Lincoln's Aluminum GMAW Welding guide wherein they mentioned that "Al-Mg alloys with Mg content over 3% are unsuitable for service temperatures over 150°F (65°C) because they are susceptible to stress corrosion cracking at higher temperatures. This is true for filler alloys as well and should be taken into account in selecting filler alloys"

http://www.lincolnelectric.com/asset...56TM/c8100.pdf
p11

Anyone made body panels with these alloys especially near heat affected zones?

5086 is nice to work with once you get past the high strength of it.
No, I would not use it on a hood or in an engine area, but would choose 5052 for that.

5086 and 5083 are not recommended for gas welding because of the high Mg content, but 5052 is fine.