Study on Welding Repair Technology for Diesel Engine Body
For the situation that the deformation of a marine diesel engine body due to impact needs to be repaired,the overwelding and repair scheme was formulated and the test research was carried out.After disassembly and cleaning of the diesel engine,the dimensions of the engine body were detected.Three processes of tungsten inert gas welding,pulse cold welding and laser welding were compared and analyzed,and the comparative experiments between the pulse cold welding and laser welding were conducted.Finally,it was determined to use laser welding method to weld the deformed cylinder hole and the machining reference main bearing seat hole.The reasonable process parameters were determined through welding special process validation.The overlay weld was uniform and continuous by using a combination of robot arm and laser welding,fixture positioning and controling the trajectory and spacing of the weld seam with numerical control program.After welding,ultrasonic aging strengthening and other methods were used to eliminate welding stress to obtain qualified weld seams.The welding deformation of the machine body is small,which does not affect the processed dimensions and achieve the welding repair of the body.The method provides guidance for high-precision repair of machined parts.
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