Some special applications require tubes with a closed or sealed end. One example are hydraulic cylinders, which normally have a lid welded to one end. But there is a much easier solution: the process used in Reisholz can produce tubes with an integral bottom.
The advantages of an integrated bottom
reduced risk of crack starter or corrosion cracks
homogeneous material properties
reduced fabrication complexity
"Special products made by Vallourec in Düsseldorf Reisholz (Germany) and Aulnoye (France)."
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