Method and equipment for manufacturing electric resistance welded steel pipe
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United States of America Patent
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Aug 18, 2015
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app pub date -
Feb 8, 2008
filing date -
Feb 13, 2007
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Abstract
A method for manufacturing an electric resistance steel pipe having a good toughness at a welded portion is provided, the method being capable of stably manufacturing an electric resistance welded steel pipe having a desirable toughness at a welded portion although a steel strip serving as a base material has a dimensional variation. Groove shapes and are applied to edges and of an open pipe, an edge shape monitor continuously captures images of the edges and immediately before electric resistance welding, and the captured images are input to an arithmetic processing unit for image processing.
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