A production process for sintering a nickel layer on an aluminum sheet, and to prepare an aluminum sheet with a nickel layer, which can be directly used for tinning and soldering. A fuse that has a sheet-shaped fuse body, the width of the fuse body does not exceed 2 mm, and the thickness of the fuse body does not exceed 0.2 mm. The fuse has a plurality of adjustment holes and/or adjustment grooves are provided in the fuse body. In one embodiment, the fuse body and the corresponding external circuit are integrally formed. In the fuse, welding platforms are protruded at both ends of the fuse body, respectively, and the width of the welding platform is greater than the width of the fuse body.