The invention provides a detection and characterization method for the plastic flow characteristic of
weld metal in the
friction stir welding process. The detection and characterization method can overcome the defects of existing
characterization methods and can achieve non-destructive, convenient and
rapid detection and characterization of the plastic flow characteristic of the
weld metal in theFSW process. The detection and characterization method specifically comprises the steps that before
butt welding in the stir
friction welding process, at least three pure
copper wires are embedded into the to-be-welded side of
base metal on the advancing side and the retracting side to serve as marking materials, wherein the
diameter of each
copper wire is 1.0-1.5 mm, the length of each
copper wire is greater than the
radius of the shaft shoulder of a stirring head; the copper wires are perpendicular to the stirring head and the
welding direction and are spaced from one another by at least 10mm in the
welding direction and evenly distributed in the thickness direction; and three-dimensional
computed tomography scanning is conducted on a weld joint through the industrial
computed tomography (ICT) after
friction stir welding, and the three-dimensional
topography is obtained after the copper wires deform and used for characterizing the plastic flow characteristic of the weld material ofthe
base metal in the
friction stir welding process. The detection and characterization method for the plastic flow characteristic of the
weld metal in the friction stir
welding process has the advantages that a welded sample is not damaged, operation is safe, the practicability is high, and the plastic flow characteristic of the material in the friction stir
welding process can be characterized rapidly and accurately.