the spheres from that Google search are made from 2 mm t316l stainless and hydro formed to the final shape, the prefab is patented so im not really allowed to discuss our methods to much but a company called
http://www.dishedends.com.au/ have a photo of a sphere under construction. this is not our method. it can also be done like a deflated soccer ball with all the hexagons welded together but must be stretched to a point somewhere between deflated and exploded as they can have around 1000-2500 psi in them
our spheres can be 2-4 mm thick and up to 10mm theoretical and from 200mm dia up to 4000mm dia (the biggest so far) we also do hydro form long radius bends for powder and chunky liquids and torispherical domes for pressure vessels
this is a 3.7 m dia architectural piece we built for a client and now sits in japan
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this its a 4" 304ss dairy tube "y" piece for milk powder at the local dairy factory, the pattern was drawn on autocad
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as you can see from the photo our shop isnt very tidy, this is a 6" od long radius bend
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