Method of production of electric resistance welded steel pipe and high Si or high Cr electric resistance welded steel pipe
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United States of America Patent
Stats
-
Jun 9, 2015
Issued Date -
N/A
app pub date -
Feb 29, 2008
filing date -
Mar 2, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a method of production of electric resistance welded steel pipe able to stably reduce weld defects due to oxides by firing plasma and furthermore able to reduce plasma jet noise and comprises shaping steel plate 1 into a tube and electric resistance welding the abutting end faces 4 during which blowing on at least the abutting end faces 4a in the region 6 at the welding upstream side from the weld point 9 where the temperature becomes 650° C. or more a reducing high temperature (pseudo) laminar plasma obtained by applying voltage to a reducing gas containing H2 gas: 2 to 50 vol % to which is added a balance of Ar gas alone or a mixed gas of Ar gas to which N2 gas, He gas, or both are added. At that time, it is preferable to make the applied voltage over 120V and the make the plasma blowing conditions satisfy the following formula (1).
First Claim
Other Claims data not available
Family
International Classification(s)
- 2008 Application Filing Year
- B23K Class
- 889 Applications Filed
- 562 Patents Issued To-Date
- 63.22 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 3 Citation Count
- B23K Class
- 13.67 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 9, 2026 |
