HIGH STRENGTH BOLT FRICTIONAL JOINING STRUCTURE AND FORMING METHOD OF METAL THERMAL SPRAYING LAYER IN HIGH STRENGTH BOLT FRICTIONAL JOINING STRUCTURE

PROBLEM TO BE SOLVED: To provide a high strength bolt frictional joining structure capable of achieving rational design by surely enhancing frictional resistance. SOLUTION: This high strength bolt frictional joining structure has a high strength bolt 4 and a nut 5, base materials 1 and 2 and a doubling plate 3 mutually frictionally joined by compressive force for fastening these members. An interface surface 31 of the doubling plate 3 has an aluminum thermal spraying layer 32 formed by spraying aluminum put in a melting state. A plurality of pores are formed in the aluminum thermal spraying layer 32, and the porosity of indicating a rate of the whole volume of the plurality of pores to the volume of the aluminum thermal spraying layer 32 is set to 5%-30%. Thus, a frictional force between the interface surfaces 31 is increased, and the frictional resistance is surely enhanced, and the rational design is achieved. COPYRIGHT: (C)2009,JPO&INPIT