OBRABOTKA METALLOV

Abstract
The paper discusses the features of formation of the cut channel of bimetallic composition “steel St3 + aluminum A5M” during high-precision plasma cutting. The mechanism of formation of the cut channel is defined as a choice of technological scheme of cutting the composition and appointment of the front side of the cut are identified. It is shown that the different character of the geometry of the cut in the areas of the bimetal is defined by thermal properties of materials composition, and above all, its melting point. Thus, when cutting the package from the side of low carbon steel the undercut, filled with elements of melted steel, is formed on portion of aluminum. This is due to significant differences in melting temperatures of steel and aluminum, as well as the weakening of the gas-dynamic flows in the cut channel, responsible for the removal of the products melt. The formations of heat affected zone in the area of low carbon steel up to 300 microns width are established. The maximum value of microhardness (up to 4000 MPa) is observed at the surface, with a gradual decrease in microhardness up to 1800 MPa, which corresponds to the hardness of the starting material. If you change the front side of the cut with steel to aluminum, deposition of products of aluminum melt in the cut channel, due to its high kinematic viscosity is observed. When cutting a bimetallic composition from the side of aluminum the heat affected zone in the area of steel decreases to 150-180 microns. X-ray and metallographic analysis showed that the products of melt in the cut channel contain elements of aluminum, steel and aluminum oxide.

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