The flying hammer bracket components of a middle power diesel engine are separately manufactured and then assembled into an integrity. The property of the integrity depends on the un dismantlement of the brackets and their axes joined by screw threads. At present, two typical techniques, the vacuum brazing and the gluing and pin fitting, are widely adopted at home and abroad. In order to verify the availability and applicability of the laser welding technology, comparisons were made between the new technology and the present technologies in aspects of the dismantled torsions, the microstructure and the microscopic rigidity of the weld area and the heat affected zone, the maintenance of fabrication precision and assembling precision of the components. The results show that the laser welding technology has advantages of the largest dismantled torsions, which are about 1 4～1 7 times higher than that of the conventional techniques, an extremely small heat affected zone, excellent in the maintenance of intrinsic mechanical properties and precision of the components, and a smooth surfaces of the welding lines.