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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.6 (1974) No.4 ■■■■■■■■■■■■■■■■■■■ |
| パイプラインの全姿勢自動溶接法の研究 New Process for Automatic Pipeline Welding 阿草 一男(Kazuo Agusa) 赤秀 公造(Kozo Akahide) 坪井 潤一郎(Junichiro Tsuboi) |
| 要旨 : 中径固定鋼管の１方向連続回転自動溶接法を確立するため，CO2-Ar気中自動溶接装置を用いて溶接姿勢とビード形成に関する実験を行い，初層は溶接速度のみの変化で，２層目以降は各層ごとに同一条件で回転溶接できることをみいだした。この結果に基づき，初層溶接速度の制御と層間での条件変更を自動化した１方向連続回転溶接の専用機を開発し，溶接所要時間の半減，継手性能の向上などが達成できた。 |
| Synopsis : The joining of medium diameter line pipe in the fixed position is a highly specialized job because of the one-side all-position welding being required. This is usually achieved at present by employing the manual metal arc process. In this case, however, many skilled welders are required and the weld quality is influenced by their skill. In the present paper, to ensure the weld quality and promote the welding efficiency, a new technique has been examined on a laboratory scale using an automatic CO2 girth welding system. The "vortex type" welding, i.e., continuous multi-pass welding in one direction along the circumference of a pipe, has been developed by a proper combination of welding variables. The root pass can successfully be made by only the travel speed control at every welding position and for each of the succeeding passes no adjustment of welding variables is necessary during welding. By using the new process, the arc time can be reduced to about one half of that of the conventional upward welding method. |
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