| 摘要 |
PROBLEM TO BE SOLVED: To provide a splice plate which stably provides a high slip factor, for use in making a high-tensile bolt frictional joint with a member of different strength. SOLUTION: An integral splice plate 2 is formed by welding together steel members which differ in surface hardness, in such a manner that the ratio of the higher surface hardness of the frictional mating surface of the splice plate 2 to the smaller surface hardness of a steel member of different strength which is to be joined to the splice plate is 1.2 or more. The frictional mating surface with the higher surface hardness has concentric projecting and recessed portions formed by rolling in a region around a bolt hole therein, with the radius of the region being preferably twice the radius of the bolt hole, and with the projecting and recessed portions on a radial cross section taking the form of continuous or discontinuous mountains. The surface projecting and recessed portions are produced by rolling, with the angle of each projecting part being 50 to 120 degrees and the radius of curvature of the end of each projecting part 1 being 0.1 mm or less, and with the height from the surface of the steel plate prior to rolling to the end of each projecting part 1 being 0.2 to 1.0 mm.
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