Sub laser instant fusion build-up welding process for damaged surface of large shaft of power station

Abstract

The invention provides a sub laser instant fusion build-up welding process for a damaged surface of a large shaft of a power station. The process comprises the following steps: step 1, taking a welding wire with the diameter of 0.6 millimeter to 1.2 millimeters or a welding flake with the thickness of 0.5 millimeter to 1.2 millimeters as welding flux; step 2, setting the maximum instant current of a sub laser instant fusion welding motor to be 800 A, the minimum arcing current to be 1.5 A, the continuous working current to be 100 A, the clearance working current to be 200 A, the energy regulating range to be 0 to 100, the impulse regulating range to be 1 to 12 Hz, and the duration regulating range to be 0.04 to 0.8 second; and step 3, bonding a welding gun of the sub laser instant fusion welding motor on the welding flux to weld a welding point with the diameter of about 5 millimeters and the thickness of 0.5 to 1.5 millimeters, and performing welding continuously until a welding face is formed by welding points. The process has the advantages that the repairing quality of build-up welding of large shafts of a power station can be improved, the processing property of repairing is improved, the period for build-up welding repairing of a power station is reduced, and the repairing cost is reduced.

Description

technical field [0001] The invention relates to the field of welding technology, and relates to a sub-laser instantaneous fusion surfacing welding process for surface damage of large-scale shafts in power stations. Background technique [0002] When the surface of the large-scale shaft of the existing power station is damaged, the methods commonly used in the repair technology of the generator rotor journal are: turning method, thermal spraying method, brush plating method, patch micro-arc welding method, laser cladding method, EDM deposition Surfacing, etc. The above-mentioned processes have played a certain role in the repair of shafts, but each has certain limitations, such as the irreversible repair of the turning method; the thermal spraying and brush plating methods have low bonding strength; the chip micro-arc welding method, the porosity of the covering layer is high. The most common one is the EDM surfacing method. The EDM surfacing method uses electric energy to ...

AI Technical Summary

Problems solved by technology

[0003] In view of the defects and problems existing in the surface damage technology of large-scale shafts in power stations, the purpose of the embodiment of the present invention is to provide a more reasonable sub-laser instantaneous fusion surfacing welding process for large-scale shafts in power stations.

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