Impeder for electric resistance tube welding
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United States of America Patent
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-
Jun 24, 1986
Issued Date -
N/A
app pub date -
Apr 4, 1985
filing date -
May 19, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An impeder for use in an apparatus for resistance tube welding by which a strip-shaped skelp continuously formed into a tubular or spirally tubular shape having spaced opposed edge portions defining a gap therebetween has the edge portions heated and pressed together for being welded. The impeder has a generally tubular casing and a core within the casing consisting of a plurality of laminated bodies each consisting of a plurality of substantially flat planar foils of metallic magnetic material, the core, when viewed in cross-section traverse to the central longitudinal axis of the casing, having the transverse cross-sections of the laminated bodies on parts of at least one circle concentric with the longitudinal axis of the casing and having the planes of the foils extending substantially radially outwardly from the longitudinal axis.
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