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Title

Modifying the liquid phase with nanoscale powders in the process of welding and cladding

Authors

¹P. Tashev, ¹N. Alexiev, ¹V. Manolov, ²A.N. Cherepanov

Organizations

¹Institute of Metal Science, Equipment and Technologies «Acad. A. Balevsci» with Haydroaerodinamics centre – BAS
Sofia, Bulgaria
²Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch RAS
Novosibirsk, Russian Federation

Abstract

Experimental studies of effect of nanomodifying powders of refractory compounds on properties of weld seam at welding of aluminum alloy and cladding a protective coating on a steel plate were conducted. The welding of aluminum alloy AMg6 was carried out using an electric arc welding with nonconsumable (tungsten) electrode (TIG welding). The modifying agent was nanoscale powder of TiCN refractory compound. Additional electrode (modifying powder wire) was produced using a vibrating ball mill, in which a mixture of sliced standard additional wire AMg6 and nanopowder TiCN had been prepared. The mixture was placed in a thin-walled container made of AMg6, compacted, and then, it was extruded using a vertical press. As a result, wires with diameter of 3 mm were obtained, containing 2 % of TiCN and 0.7 % of TiCN, respectively. Welds were obtained with the standard additional wire and modified wire containing TiCN. The protective coating for steel was deposited using plates with thickness of 3 mm made of steel S235JR. Beforehand, they were subjected to mechanical cleaning and degreasing. The depositing was accomplished by the TIG method. The coating was standard additional wire DT-SGMo by DIN 8576 with diameter of 1.6 mm. The wire surface was covered by a thin film containing chromium clad TiN nanoparticles. The cladding was accomplished by mechanical chemical treatment in a planetary mill. The studies have shown that the modification by nanopowders leads to a substantial refinement of the seam structure and increase of its hardness both for aluminum alloy and structural steel cladding.

Keywords

TIG welding, protective coating, nanopowders, aluminum alloy, steel plate, structure, hardness

References

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For citing this article

Tashev P., Alexiev N., Manolov V., Cherepanov A.N. Modifying the liquid phase with nanoscale powders in the process of welding and cladding // The Research of the Science City, 2017, vol. 1, no. 1, pp. 16-21.

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