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
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"Special products made by Vallourec in Düsseldorf Reisholz (Germany) and Aulnoye (France)."
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