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Butt welding method for extra thick plates and butt welding equipment for extra thick plates
Butt welding method for extra thick plates and butt welding equipment for extra thick plates
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摘要
PROBLEM TO BE SOLVED: To provide a butt welding method for an extra thick plate and a butt welding equipment for an extra thick plate capable of improving the toughness of multi-pass welding performed on a narrow groove of the extra thick plate. A butt welding method for an extremely thick plate for performing a multi-layer welding in which a lower layer in which each layer is formed by one welding bead, an intermediate layer including a plurality of layers, and an upper layer is formed at the groove. The step of forming the intermediate layer includes a single layer forming step S1 of forming one weld bead in the groove, a cooling step S2 of cooling one weld bead to a predetermined temperature, and a cooling step of the cooled weld bead. After cooling for heating, a reheating step S3 is provided. In addition, the butt welding method for extremely thick plates is a welding bead of layers required for the multi-layer welding by repeating a cycle consisting of a single layer forming step, a cooling step and a reheating step after cooling for the number of layers of the intermediate layer. Laminating step S4 for laminating. [Selection diagram] Figure 2
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