To provide a method for friction stir welding a stainless steel panel to an extruded aluminum alloy shape member, and also to provide a structure having superior insulation performance.
A side structure 2 of a car body 1 is formed by friction stir welding aluminum alloy extruded hollow shape members 30, 40 from the inner side of the car. On the outer side of the side structure 2, stainless steel panels 10, 20 are welded by the friction stir welding to the butted portion between the hollow shape members 30, 40 from the inner side of the car. After friction stir welding the butted portion between the hollow shape members 30, 40, inner face plates 31, 41 of the hollow shape members 30, 40 are connected via a connecting member 51. Between the stainless steel panels and the hollow shape members 30, 40, there is a space for arranging a heat insulation members 80. According to the present method, scratches on the surface of the car body can be reduced by arranging stainless steel panels 10, 20 on the outer side of the car, and insulation performance can also be improved thereby.
TOTORI SEIJIROU
OKADA TOMONORI
SAGAWA TOSHIAKI
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