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welded high frequency erw pre d

Description: Dealing with LowFrequencyWelded ERWjfkfew if any lowfrequency welders were still being used. With the use of highfrequency current, the problem of contact resistance is virtually nonexistent. As a result, highfrequencywelded pipe tends to be relatively free of the bondline defects that were common in the lowfrequency and d.c.welded material. The performance of ERW materials

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