Підвищення тріщиностійкості при аргонодуговому високошвидкісному наплавленні на низькій погонній енергії

Abstract

The rolling mills are operated under high specific pressures, therefore the rolls are produced from high carbon steel 90HF, prone to hot and cold cracking. Therefore, crack resistance and wear resistance increase is an important scientific and technical problem. An effective way to increase crack resistance is arc and energy concentration, which increase the surfacing process. Arc concentration due to electrode diameter decrease provides increase in magnetic field induction, electromagnetic pressure of compression, pinch effect, the weld pool liquid metal crystallization speed, crack resistance and wear resistance. It also provides droplets and microstructure grinding, welding stresses reduction. It has been established that with the carbon content increase, the heat input decreases, thus ensuring heat input decrease, welding stresses reduction, liquid metal crystallization rate increase, microstructure grinding, the interatomic compression pressure and deposited metal crack resistance increase. The argon-arc high-speed surfacing at low heat input of roll necks with chromium-nickel wire, which provides arc and energy concentration, heat input and welding stresses reduction, crystallization rate increase, microstructure grinding, interatomic distance reduction, the pinch effect and interatomic pressures of compression enhancement, rolls crack resistance, wear resistance and durability increase, has been developed