Frictional churning junction manner of the aluminum based extrusion section and the aluminum based extrusion section null which has its coupling form and the said coupling

摘要

PROBLEM TO BE SOLVED: To provide a friction stirring and joining method of an Al extruded shape in which high joint strength can be obtained both for non-aging treated material and an aging-treated material, a joint shape, and an aluminum extruded shape provided with the joint shape. SOLUTION: A friction stirring and joining method, a joint shape, and an aluminum extruded shape to satisfy the below-described formulae 1 and 2 for a non-aging treated material, and to satisfy formulae 2 to 4 (described below) for an aging-treated material, are provided, where t1 (mm) is the thickness of base material parts M1 , M2 , t2 (mm) is the depth of a joined part, t3 (mm) is the thickness of heat affected zones HAZ1 , HAZ2 , w1 (mm) is the width of a thick-walled part between an outer end of a weld bead and an inner end of the base material part, HM is the hardness of the base material after the friction stirring joining, HB is the hardness of a bead part, HMa is the hardness of the aging-treated base material part, HBa is the hardness of a bead part B, and HHa is the hardness of heat affected zones HAZ1 , HAZ2 . Formula 1 : t1 ×(HM/ HB)×0.85=t2 =t1 ×(HM/HB)×1.0, Formula 2 : t1 ×1=w1 =t1 ×3, Formula 3: t1 ⊗(HMa / HBA)×0.95=t2 =t1 ×(HMA/HBA)×1.0, and Formula 4: t1 ⊗(HMa /HHa )×0.9=T3 =t1 ×(HMA/ HHa )×1.0.