DISSIMILAR METAL WELD OF LARGE WELDED STRUCTURE SUCH AS TURBINE ROTOR AND METHOD OF MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide dissimilar metal welds including a buttering portion with a small variation in strength distribution in a plate thickness direction, and a method of manufacturing the dissimilar metal welds.

SOLUTION: The dissimilar metal welds are formed by welding two parent materials having at least one of different compositions and different refining conditions through a buttering for alleviating mismatch between one of the different compositions and the different refining conditions of the two members and through a welded metal for joining one of the parent materials and the buttering. The buttering is formed of welding metals laminated in a plate thickness direction, and a dilution ratio of the buttering with the parent materials is 50% or less. The method includes the steps of performing butt welding on a dummy material formed by increasing a groove depth by providing a member on a bottom side of a welding groove and on the parent materials by using the buttering; and processing a groove within the welding metal formed of the buttering.

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