High-strength steel plates such as YP460 MPa class with more than 50 mm in thickness, to which high arc energy welding can be applied, have been developed. This trend requires a high arc energy welding process with higher efficiency that can be applied to plates of 50 mm-thick or more. Welding consumables for such a welding process are also required. This work serves two purposes. The first is to develop a new welding process with a travel speed twice as high as that of the ordinary VEGA process (Single-electrode Vibratory Electrogas Arc Welding, 1E-VEGA process) and the second, to develop flux-cored wires for the present welding process that can be applied to the recently-developed YP460 MPa class steel. Electrogas arc welding with high efficiency (Two-electrode Vibratory Electrogas Arc Welding, 2E-VEGA process) and flux-cored wires for the 2E-VEGA process have been developed. They can be applied to YP460 MPa class extremely thick steel plates for very large container ships. The travel speed of the developed 2E-VEGA process is about twice as high as that of the ordinary 1E-VEGA process. Weld metal obtained with the present process and the present wires satisfied the target requirements of YP (yield point or proof stress) >= 460 MPa, TS (tensile strength) >= 570 MPa, vE-20 (-20 deg C Charpy absorbed energy) >= 53 J and Hv (hardness number) <= 210 Hv in Vickers scale, even when 30 kJ/mm arc energy welding for 51 mm-thick plates was conducted. Using the present process and the present wires, sufficient fracture toughness of joints welded with high arc energy can be obtained.
Development of welding materials for high heat input welding compatible with thick steel plates of 460 MPa yield point class for very large container ships
Welding in the World ; 54 , 1/2 ; R35-R41
2010
7 Seiten, 9 Bilder, 3 Tabellen, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
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