Author Topic: What is the Falcon 9 octaweb made of?  (Read 1992 times)

Offline Slarty1080

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What is the Falcon 9 octaweb made of?
« on: 03/30/2018 03:35 pm »
What material is used for the Octaweb? It looks like a heavy piece of kit, just wondered if it was Aluminium, Aluminium alloy, Steel or even Titanium? I guess that even with 10 flights expected for the block 5's that that amount of Titanium would be too expensive?
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Offline envy887

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Re: What is the Falcon 9 octaweb made of?
« Reply #1 on: 04/01/2018 12:52 am »
This is a good question. I always assumed it was titanium, but SpaceX published pictures of a worker welding (TIG?) on it in the open air, which doesn't really work with titanium. So I'd guess either Li-Al alloy or stainless steel.

Offline su27k

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Re: What is the Falcon 9 octaweb made of?
« Reply #2 on: 04/01/2018 05:12 am »
From the reddit comment of an ex-employee who welded the octaweb:

Quote
2219 aluminum/lithium alloy

This is from a year ago, but I doubt they'll change it for Block 5.
« Last Edit: 04/01/2018 05:38 am by su27k »

Offline Bananas_on_Mars

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Re: What is the Falcon 9 octaweb made of?
« Reply #3 on: 04/01/2018 12:55 pm »
Somewhere along the way(Block 4ish?) they changed to an octaweb that's bolted instead of welded.
So the material might have changed.

Online LucR

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Re: What is the Falcon 9 octaweb made of?
« Reply #4 on: 05/11/2018 06:49 pm »
From Elon's Block 5 phone presser transcript:
Quote from: theinternetftw link=https://gist.github.com/theinternetftw/5ba82bd5f4099934fa0556b9d09c123e
But this is a much stronger octaweb structure. It's made of a much higher strength of bolted aluminum. A 7000 series instead of a 2000 series.
So they did change it for block 5.

Online kevinof

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Re: What is the Falcon 9 octaweb made of?
« Reply #5 on: 05/11/2018 07:00 pm »
Used to be welded together, now it's bolted which (according to Space X) makes building and refurb easier.

Tags: octaweb Falcon 9 SpaceX