| 摘要 |
PURPOSE: A friction stir welding method is provided to improve the tensile strength, fatigue strength, and corrosion resistance of a weld zone by enabling efficient welding on a high-melting point material as well as on a low-melting point material. CONSTITUTION: A friction stir welding method comprises the steps of: plunging a rotary tool(11), which rotates at a first rotating speed of 1200-1700 RPM toward a junction part(2) between two flat plates, by a predetermined plunge depth of 1.43-1.52 mm in the junction part while vertically moving the rotary tool at a predetermined plunging speed of 5-10 mm/min; dwelling the rotary tool for a predetermined dwelling time; friction-stir-welding the junction part of the flat plates by transferring the rotary tool in the longitudinal direction of the junction part while rotating the rotary tool at a second rotating speed and applying pressure to the rotary tool.
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