Ure, If I understand your meaning about welding a tank in a spiral fashion,
that sounds like the old 'damascus' gun barrel..
Also, the Corporal short range ballistic rocket tanks were fabricated from
36" wide 19-9DL austenitic stainless steel in a spiral fashion.
This method is ingenious as it allows a tank of any diameter and length to
be made from a standard coil of 36" wide metal.
Like a cardboard toilet paper or paper towel center tube. And as an added
cherry on top, the weld is under less stress than a longitudinal weld
which is in pure hoop stress whereas the angle weld in a spiral weld is
some cosine of its angle, somewhere between a circumferential and
longitudinal (hoop) weld, the former of which is under half the stress of
the latter.
Got to love metallurgy,geometry and mathematics.
Ken.
On Thu, Dec 29, 2022 at 2:10 PM Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx> wrote:
Am 29.12.22 um 20:10 schrieb roxanna Mason:
True, "if you're not failing you're not progressing - fast enough".
depends.
If you are progessing with fullsize fullfunction samples that might be
the case. ( like SpaceShip, the run of major structural Ooopses ..)
If you assemble from individually tested modules or solutions
your failures should be in detail progressing/testing and thus limited.
( IMU the Apollo programm worked a lot on that path.)
in the end it is an optimax thing.
apropos: why did they weld the tanks together from rectangular sheets?
One Mr Mannesmann invented spiral welding using sheet tape ( or what is
the proper name for longer sheet metal bales?)
and it has been used in rocketry couple of decades ago already.
Uwe
--
Uwe Klein [mailto:uwe@xxxxxxxxxxxxxxxxxxx]
Habertwedt 1
D-24376 Groedersby b. Kappeln, GERMANY
