DLA Piper LLP (US)
Friction stir welding method for steel sheets and method of manufacturing joint
A friction stir welding method for welding steel sheets together includes a heating device disposed ahead of a rotating tool in an advancing direction that preheats an unwelded portion before the welding thereof by the rotating tool and at the time of preheating, the surface temperature distribution in a direction perpendicular to the advancing direction in a position at which the welding by the rotating tool is initiated is set such that given that TAc1 is the Ac1 point of a steel sheet, the maximum temperature (TU) thereof is 0.6×TAc1<TU<1.8×TAc1, and given that L is the width of the heating region exceeding a temperature (TL)=0.6×TAc1, 0.3×d≦L≦2.0×d is satisfied with a diameter (d) of the shoulder.
JFE Steel Corporation
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Muneo Rinsei Koichi
Matsushita Ikeda Taniguchi