| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy complementary rigid beam to be manufactured with less weld lines for easier manufacturing work and lighter weight. SOLUTION: The I-type complementary rigid beam 1 has web portions 4 arranged between an upper flange portion 2 and a lower flange portion 3. It comprises two T-type end members 6A, 6b each having the flange portion 2 and part of the web portion 4 integrally formed by the extrusion molding of an aluminum alloy and two intermediate members 7A, 7B arranged between both T-type end members and each having a horizontal complementary rigid material 5 integrally formed on one side face of the intermediate web portion 4 having a preset height by the extrusion molding of an aluminum alloy. Both web portions 4, 4 between each of the T-type end members 6A, 6b and each of the intermediate members 7A, 7B and both web members 4, 4 between the upper and lower adjacent intermediate members 7A, 7B are joined to each other using a friction stirring joint method. COPYRIGHT: (C)2006,JPO&NCIPI
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