I've wondered this too.Factory making Cybertruck does not need a paint shop
The Berlin factory Model Y will have front and back mega-castings.
But what about Cybertruck, does Cybertruck need mega-castings too?
I might be wrong as well but I don't see how Tesla or anyone else can make SS castings. If they make castings for the CT it will be of the same aluminium allow they developed for the Model Y. But I believe they would need a welded steel structure for CT underbody.A big casting right about where the cab and the bed meet would answer a lot of questions I have.
Even if my questions are wrong, stainless steel castings seem like a reasonable thing and I can imagine them being useful in several places in the structure.
Stainless steel can be cast:I might be wrong as well but I don't see how Tesla or anyone else can make SS castings. If they make castings for the CT it will be of the same aluminium allow they developed for the Model Y. But I believe they would need a welded steel structure for CT underbody.
The heavy Cybertruck is supposed to be rated to handle huge payloads, huge towing, heavy duty off-roading at high speed and maybe even Baja.The answer is 'sure'.
While the structure is folded steel, you still need stuff to hang the batteries from, firewalls around the cab, the rig to hang the wheels and motors from. Aluminum used that way is very stiff, and fills the gaps.
...You use aluminum so you can save that weight for things you need, like the batteries and skeleton.The heavy Cybertruck...
Yes, the interior shell and many components could be aluminum or light steel....You use aluminum so you can save that weight for things you need, like the batteries and skeleton.
Yes, they described the exoskeleton as folded and welded.
But there are lots of parts you need, but don't need the strength and certainly not the weight of steel - many of the interior parts. You don't want a steel panel for the firewalls, because you don't want the weight or strength there, you need 'nonflammable'. You don't want steel for battery cables or electrical housings because that's just extra weight. Plastics and aluminum and laminate castings are better for that. Lots of these places need bulk not thin strength, so that's where the aluminum will go. Or needs heat conducting properties. Steel does that poorly!
Save the weight for the exoskeleton.
A steel pipe is strong, a steel bar is strong... but for the weight over a span, a steel pipe filled with aluminum would be stronger.
I should have specified that die casting SS is currently not possible, although Tesla could build a giant ceramic die but that thing will break/crack after a dozen of cycles. Anyway I still don't see Tesla using SS for anything else than CT's skin, which is huge SS quantity by itself. Stainless steel has at least 8% Nickel content and Elon's already got a headache sourcing the Nickel for the batteries.Stainless steel can be cast:
Using the same material makes avoids bimetallic corrosion, and makes it much easier (possible?) to weld together.
Many vehicles use a combination of steel and aluminum, so using both is definitely possible. There are definitely engineering tradeoffs to be considered.
However, I'm not an expert in those tradeoffs, so I'll merely assert that it is possible to cast stainless steel, and that there are tradeoffs to using aluminum castings, and that there questions here that could be better answered by someone else.
This is true of zinc, silver, and lots of metals, tho. And you can electrically balance it or use it in reverse! They did this to restore a bunch of bridges along the Pacific Coast Highway.Also it's not typically a good idea to use aluminum an steel together as galvanic reactions would eat the aluminum
Cybertruck is going to have a structural body, why would they add the SAME structural underbody they use on the other cars? It wouldnt make sense.I would be willing to bet they are going to use the large aluminum casting front and rear of the cybertruck to create the super rigid assembly they spoke about during battery day which integrates the battery pack. This is part of what is needed ,from my understanding of the announcement, to get the cybertrucks price and range where it needs to be. They need to implement all of those new design aspects. Batteries, casting, manufacturing process ect. Actually I think it would be stupid not to use the technology, they have spent years developing all of this.