US Patent Issued to Kawasaki Jukogyo on May 20 for "Friction stir spot welder and method of operating friction stir spot welder" (Japanese Inventors)

ALEXANDRIA, Va., June 16 -- United States Patent no. 12,303,995, issued on May 20, was assigned to Kawasaki Jukogyo K.K. (Kobe, Japan).

"Friction stir spot welder and method of operating friction stir spot welder" was invented by Naoki Takeoka (Kobe, Japan), Yoshitaka Muramatsu (Kobe, Japan) and Ryoji Ohashi (Kobe, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A friction stir spot welder includes a pin, a shoulder, a rotary driver, an advance-retract driver, and circuitry. When a preset and predetermined first period of time has elapsed in a state where a speed of the rotating shoulder in an axial direction or a speed of the pin in the axial direction is a preset and predetermined first speed, the cir...