Impact Analysis of Changes in Gas-dynamic Process Parameters During Laser Welding of Steels on the Mechanical Characteristics of Welded Joints

Artemii Bernatskyi, Oleksandr Siora, Mykola Sokolovskyi, Volodymyr Lukashenko, Taras Nabok

Abstract


The aim of this study is the establishment of the regularities of parameter influence during gas-dynamic processes of laser welding in steels on the mechanical characteristics of welded joints. When using GOST 09G2S steel, the increase in hardness is facilitated by the increased content of manganese (1.3...1.7%). The increase in hardness is also partly related to the change in the transparency of the plasma torch, which is formed above the steam-gas channel, as well as to the conditions of heat removal when using different protective gas media. Thus, the depth of penetration has decreased by more than two times due to shielding of radiation by the plasma torch in the case of using argon as the shielding gas. At the same time, the cooling rate of the liquid metal has increased, which led to an increase in the microhardness of the welding seam metal. The results obtained over the course of the study are planned to be used in the development of laser welding technologies for products of various industries, including but not limited to: aerospace, chemical, tooling as well as others.

Keywords


laser welding; steels; gas protection; mechanical characteristics; microhardness

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References


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DOI: http://dx.doi.org/10.52155/ijpsat.v36.1.4892

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