Structure


Application Number  00128324 Application Date  2000.11.24
Publication Number  1306891 Publication Date  2001.08.08
Priority Information   2000/1/27 JP 18262/2000  
International
Classification
 B21D47/01;B23K20/12;F16S1/02  
Applicant(s) Name  Hitachi, Ltd.  
Address    
Inventor(s) Name  Nakamura Hideyuki;Kawasaki Katsu;Makino Toshiaki  
Patent Agency Code  11038 Patent Agent  sun zheng
AbstractEnd portions of face plates 21 and 22 of a hollow extruded frame member 20 are connected by a rib 24 and are welded to end portions of face plates 11 and 12 of a second hollow extruded frame member 10 by friction stir welding. A surface of a connection portion of the end portion of the face plate 21 and the rib 24 is constituted by circular arcs 31 and 32 which are recessed in the hollow extruded frame member 20, and similar a surface of a connection portion of the end portion of the face plate 22 and the rib 24 is constituted by circular arcs 33 and 34. The diameter of the circular arcs 31,33 is smaller than the diameter of the circular arms 32,34. Accordingly, a structure body having a light weight can be obtained.