METHOD FOR REINFORCING RAIL BY LASER AND AUXILIARY HEAT SOURCE EFFICIENT HYBRID CLADDING
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United States of America Patent
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Jun 25, 2020
app pub date -
Jan 18, 2019
filing date -
Jan 23, 2018
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The disclosure discloses a method for reinforcing a rail by laser and auxiliary heat source efficient hybrid cladding. The laser and the auxiliary heat source simultaneously apply on a region to be cladded of a rail surface. The laser serves as a main heat source to enable simultaneous and rapid fusion of an added metal powder and partial substrate material in the rail surface to form a molten pool. The auxiliary heat source moves with the laser heat source in the same direction at the same speed, and performs synchronous preheating and/or post-heating on the laser molten pool, the heat-affected zone and the surface layer of the rail substrate to reduce the temperature gradient, thereby reducing the cooling rate, and avoiding martensite transformation and cracking in the heat-affected zone.
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