Welded tube manufacturing apparatus and welded tube internal surface bead cutting apparatus
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United States of America Patent
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-
N/A
Issued Date -
Nov 21, 2002
app pub date -
May 17, 2002
filing date -
May 21, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This apparatus manufactures a welded tube by curling a metal strip T into a tube shape, heating the two edges thereof using an induction heating coil 6, and pressure welding the two edges using squeeze rolls 8. A ferrite core 21 for increasing heating efficiency that has a substantially circular arc shaped cross section is provided at a position on the top surface portion 25 of an impeder body 24 directly below the induction heating coil 6. A protective layer 29 formed from fluororesin is provided on the top surface of the impeder body and this protective layer catches spatter 'c' generated during welding. The distal end of a cooling water supply tube 27 is embedded in a concave groove 26 in the impeder body 24 and the ferrite core 21 is cooled via a through passage 21a formed between the ferrite core 21 and a flat surface portion.
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