# Determination of the Filler Concentration of the Composite Tape
## 2 Materials and Methods
A feature of welding tapes with a flux core is that when heated over the entire thickness of the layer, due to the many transitional resistances inside it, the adjacent part of the part also heats up. Depending on the melting point ranges, uneven changes occur in the various components of the composite material. The refractory particles remain unchanged or crushed; medium-melting, plastically deformed and sintered; and low-melting, as they melt and fill the pores between the particles with a higher melting point. The layer to be welded almost always remains heterogeneous and consists of the same particles as the original composite material. The paper proposes the determination of discrete mechanical and tribological properties by the diameter of CBRTB (during production or repair). For this purpose, it is proposed that a composite tape is used. This tape is welded using butt welding. To ensure the sufficient adhesion of the composite strip to the cylindrical surface of the CBRTB, the pressure on the roller electrode should not be less than 60 MPa, and to prevent a significant reduction in the thickness of the strip, it should not exceed 80 MPa. The welding speed of the composite strip on the cylindrical surface of the CBRTB is in the range of 0.5-0.8 m/min. In order to ensure the required abrasion resistance of the composite tape, the value of the matrix hardness should be in the range of 300-400 HB. To achieve these conditions, the matrix must have an austenitic and martensitic structure. From the point of view of functional properties for the repair of the CBRTB and the formation of a composite tape according to the technical and economic criteria, carbides are the most expedient solid material. At the same time, chromium carbides (Cr\({}_{3}\)C\({}_{2}\)) and titanium carbides (TiC) were purchased for the manufacture of wear-resistant belts, materials, and coatings for practical use. These carbides have sufficient electrical conductivity and wetting with iron group metals, making them suitable for electric welding or moxibustion methods. According to technical and economic criteria, it is recommended that iron is used as the matrix material (for example, iron powder 7439-89-6), which has high physical, mechanical and technological properties. The carbon content of 0.25% in the 7439-89-6 powder makes it possible to form hardened structures during the contact welding of the CBRTB, which increases the cylindrical wear resistance of the cylindrical working surface. In the composite tape, the fillers used are chromium carbide powder 12012-35-0 and titanium carbide powder 12070-08-5. The production of composite tapes is a rather complicated process with the thermomechanical interaction of the given components. In order to improve the formation of strong bonds and the necessary electrical conductivity of the initial mixture, as well as the sufficient plasticity of composite tapes, this study proposes to introduce chromium and nickel into their content. The increased activity powders of composite tape during sintering or processing during welding is associated with an excess supply of surface energy, which is due to the presence of a high density of dislocations in the crystal lattice, and the occurrence of relaxation processes, which additionally provide free energy, thereby helping to increase the diffusion activity. As a result, the metal matrix of the composite tape will consist of a ternary alloy, which contains: powder based on iron, chromium, and nickel. The following concentration distribution was applied in the work: 70% Fe, 20% Cr, 10% Ni. The wear resistance of the welded material of the composite tape depends on both the composition and rigidity of the matrix and the volumetric content of the filler. If its content is insufficient, the matrix is subject to wear, followed by the crumbling of the filler, and with an excess amount of the filler, the increased wear of the matrix is associated with increased porosity, and the possible spalling of the filler.