METHOD FOR MANUFACTURING TANKS
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United States of America Patent
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app pub date -
May 11, 2007
filing date -
May 11, 2007
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Abandoned
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Abstract
The invention relates to the manufacture of tanks from one ore more metal plates using a friction stir welding process The metal plate or plates is first formed into a tubular shape with one pair of opposite edges facing one another to form a longitudinal joint line, the opposite edges then being friction stir welded together. At least a part of the friction stir welded region is cold worked and subsequently the tube is heat treated at a temperature above the recrystallisation temperature.
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