METHOD FOR PRODUCING STEEL CONDUIT TUBE AND HIGH SI COMPONENT OR HIGH CR COMPONENT STEEL CONDUIT TUBE
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 abuttin...
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| creator | HAMATANI, Hideki NAKAJI, Tomohiro MUKAI, Michimasa ASAHI, Hitoshi TAKEUCHI, Sunao MIZUHASHI, Nobuo TANIMOTO, Michitoshi MIYAKAWA, Takashi KODAMA, Shinji |
| description | 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 H 2 gas: 2 to 50 vol% to which is added a balance of Ar gas alone or a mixed gas of Ar gas to which N 2 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). 150 < 4 × G i M i À × D × ¼ ave , T = 7000 < 400 |
| format | Patent |
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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). 150 < 4 × G i M i À × D × ¼ ave , T = 7000 < 400</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM |
| title | METHOD FOR PRODUCING STEEL CONDUIT TUBE AND HIGH SI COMPONENT OR HIGH CR COMPONENT STEEL CONDUIT TUBE |
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