ELECTRIC-RESISTANCE WELDED PIPE WELDING DEVICE AND ELECTRIC-RESISTANCE WELDED PIPE WELDING METHOD

• Main Authors: HAYASHI MASAHIDE, TAIRA MASATO
• Format: Patent
• Language: English; Japanese
• Published: 11.03.2021
• 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

To accurately detect welding abnormalities when manufacturing an electric-resistance welded pipe by welding using high-frequency power generated by switching.SOLUTION: Provided is an electric-resistance welded pipe welding device for molding a traveling steel sheet into a cylindrical open pipe, and welding both circumferential-directional end parts of the open pipe each other by high-frequency power, and that includes switches 121 to 124, and comprises: an inverter section 120 for converting and outputting direct-current power to the high-frequency power by switching the switches 121 to 124; a voltmeter 150 for measuring a voltage of the direct-current power inputted to the inverter section 120; and a determination section 202 for, based on a measurement result at the voltmeter 150, determining presence or absence of welding abnormalities.SELECTED DRAWING: Figure 2 【課題】スイッチングにより生成された高周波電力を用いて溶接し電縫管を製造する際の、溶接異常を正確に検知する。【解決手段】走行する鋼板を円筒状のオープン管に成形し、当該オープン管の周方向両端部同士を、高周波電力により溶接する電縫鋼管溶接装置であって、スイッチ１２１〜１２４を有し、スイッチ１２１〜１２４のスイッチングにより、直流電力を高周波電力に変換し出力するインバータ部１２０と、インバータ部１２０に入力される直流電力の電圧を測定する電圧計１５０と、電圧計１５０での測定結果に基づいて、溶接異常の有無を判定する判定部２０２と、を備える。【選択図】図２