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A friction stir welding method includes a first friction stir welding process of forming a first stirring region in a beveled part, by moving a first rotary tool disposed on an upper side in a thickness direction across the beveled part, while rotating the first rotary tool; and a second friction st

A friction stir welding method includes a first friction stir welding process of forming a first stirring region in a beveled part, by moving a first rotary tool disposed on an upper side in a thickness direction across the beveled part, while rotating the first rotary tool; and a second friction stir welding process of forming a second stirring region in the beveled part, by moving a second rotary tool disposed on a lower side in the thickness direction across the beveled part, while rotating the second rotary tool, simultaneously with the first friction stir welding process or after performing the first friction stir welding process.

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1. A friction stir welding method comprising: a first friction stir welding process of forming a first stirring region in a welded part of a metallic material, by moving a first rotary tool in a first advancing direction while rotating the first rotary tool, the first rotary tool being disposed on o

1. A friction stir welding method comprising: a first friction stir welding process of forming a first stirring region in a welded part of a metallic material, by moving a first rotary tool in a first advancing direction while rotating the first rotary tool, the first rotary tool being disposed on one side of the welded part in a thickness direction across the welded part; anda second friction stir welding process of forming a second stirring region in the welded part, by moving a second rotary tool in a second advancing direction while rotating the second rotary tool, simultaneously with the first friction stir welding process, the second rotary tool being disposed on the other side of the welded part in the thickness direction across the welded part, wherein:the first stirring region is a region which reaches an interior of the welded part from the one side of the welded part in the thickness direction, the second stirring region is a region which reaches an interior of the welded part from the other side of the welded part in the thickness direction, the first stirring region and the second stirring region overlap each other inside the welded part in the thickness direction, a first rotary axis of the first rotary tool and a second rotary axis of the second rotary tool are provided in parallel, and the first rotary tool and the second rotary tool are configured to he shifted left and right orthogonal to the thickness direction,wherein the first rotary tool includes: a first tool body having a first shoulder part which is in contact with one surface of the welded part, and a first probe protruding from the first tool body toward the second rotary tool, wherein the second rotary tool includes: a second tool body having a second shoulder part which is in contact with the other surface of the welded part, and a second probe protruding from the second tool body toward the first rotary tool, and wherein the first rotary tool and the second rotary tool are configured to be shifted in a range in which at least a part of the first shoulder part and the second shoulder part overlap each other in the thickness direction;wherein the first rotary tool is configured to rotate about the first rotary axis, the first shoulder part has an outer circumferential surface, the first probe has a circular first front end surface on a front end side that is a second rotary tool side, the second rotary tool is configured to rotate about the second rotary axis, the second shoulder part has an outer circumferential surface, the second probe has a circular second from end surface on a front end side that is a first rotary tool side,a distance between the first rotary axis and the second rotary axis is defined as L, a diameter of the first shoulder part is defined as D1, a diameter of the first front end surface is defined as d1, a diameter of the second shoulder part is defined as D2, and a diameter of the second front end surface is set defined as d2,in a case where (D1/2+d2/2)≤(D2/2+d1/2), the first rotary tool and the second rotary tool are configured to be shifted so that the distance L is in a range of (d1/2+d2/2)(D2/2+d1/2), the first rotary tool and the second rotary tool are configured to be shifted so that the distance L is in a range, of(d1/2+d2/2)