Influence of plasma spray welding pool temperature on microstructure and properties of welding layer based on real-time measurement

doi:10.13251/j.issn.0254-6051.2023.01.039

Abstract

Abstract: Mainly due to the problems of relying on manual intervention and low level of automation, the molten pool temperature varies dramatically during plasma spray welding, and the quality of spray welding layers is significantly affected. As a result, real-time control of the molten pool temperature in the spray welding process is an unavoidable choice for the advancement of plasma spray welding technology. In order to study the influence of the temperature change of the molten pool on the microstructure and properties of the spray welding layers and to lay the groundwork for developing the real-time monitoring technology, the on-line monitoring method was adopted to measure the temperature of the molten pool during the spray welding process in real time, and the influence of the temperature of the molten pool on the macromorphology, microstructure composition and microhardness of the spray welding layers was analyzed. The results reveal that when the molten pool temperature is maintained at around 1400 ℃ in the plasma spray welding process, the spray welding layers have good microstructure and characteristics. When the molten pool temperature is too low during the spray welding process, it is easy to cause the formation of oxide inclusions in the near fusion zone. When the molten pool temperature is too high during the spray welding process, the dilution rate of the spray welding layer is likely to increase. When the spray welding current is 110 A, the microhardness of the front sprayed layer is (670±26) HV0.1, which is significantly higher than that of the middle sprayed layer as (550±20) HV0.1; when the spraying current changes from 70 to 110 and to 150 A, the microhardness of the spray welding layers shows a trend from high to low.

Key words: plasma spray welding, molten pool temperature, online monitoring, microhardness

CLC Number:

TG455

Wu Mian, Pan Lin, Li Yinhua, Yu Siliang. Influence of plasma spray welding pool temperature on microstructure and properties of welding layer based on real-time measurement[J]. Heat Treatment of Metals, 2023, 48(1): 224-231.

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