Welding 7075 alloy.

[berkshire]

This news article showed up today. If it pans out this would revolutionize the use of 7075 and similar alloys. Anybody else heard of this?

B.E.

https://newatlas.com/welding-aa7075...tm_source=Campaign Monitor&utm_term=Read more

You are judged not by what you know, but by what you can do.

 

[kingnero]

I've heard of it online few months ago, the use of Ti nanoparticles, but I haven't seen anything to back this claim up. Would be nice if they shared a but more information or results/details/micrographs/... of actual tests though... unless it's just a teaser until everything gets patented by lawyers.

 

[berkshire]

It would be nice if this weld problem could be solved with something as simple as a welding rod.
B.E.

You are judged not by what you know, but by what you can do.

 

[drawoh]

berkshire,

They have solved the problem of the aluminium 7075-T6 cracking. The welding still destroys the heat treat. I see no problems heat treating a bicycle frame. A car frame or airplane wing could be interesting.

--
JHG

 

[berkshire]

Drawoh,
So this begs the question. Can you heat treat the welded area ? It would be nice to weld a sub assembly then heat treat and age a part. but somehow I suspect that the weld deposit would not play nicely. There are still too many un answered questions here.
The other question here is, would the weld take the HAZ to the annealed condition, or would it take it to the AQ condition?
The article makes the statement "What's more, it is believed that post-welding heat treatments could boost the strength of the 7075 welds up to 551 megapascals, which is on par with the weld strength of steel.". This may be true for the alloy but I want to see test results on the welds before I believe that.
B.E.


You are judged not by what you know, but by what you can do.

 

[drawoh]

berkshire,

According to the article, the filler is Aluminium 7075. Everything is heat treatable. Can you contain your heat threat to a small part of the weldment? I think the whole weldment must fit in the oven.

Any welding process is sensitive to workmanship. You select aluminium 7075 because you want something strong and light. You further reduce the weight by selecting a small safety factor, thus making workmanship that much more critical.

If you did not care about weight, you would use cold rolled steel, and you would over-design the welded joint.

--
JHG

 

[3DDave]

I like maraging steel. But no one likes the price.

 

The problem with nanoparticles is that they don't remain nanoparticles when heat is applied.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."