METHOD FOR REPAIRING FRICTION-STIR WELDED PART

摘要

PROBLEM TO BE SOLVED: To improve a method for repairing a friction-stir welded part in manufacturing a structure such as a rolling stock by friction-stir welding an aluminum alloy. SOLUTION: A weld bead 50 is formed by performing the friction stir welding of hollow-extruded first member 20 and second member 30 along a welding part 40 with a base metal of A6N01 as aluminum alloy. When the weld bead 50 is defective, the bead including the defects is removed by grinding to form a repair area. The repair bead is formed by the TIG welding in the repair area. A welding rod of the TIG welding is formed of the same material as the base metal to realize the uniform composition of the bead. When the hair line working is performed in the friction-stir welded part, a surface of excellent appearance in which a boundary with the member and a trace of the defects are less remarkable can be obtained.