| 摘要 |
<p>The invention relates to removable reinforcements of solid rigid composite type, to a tubular electrode with composite core for build-up welding the areas subjected to wear and to a process for making the same, the reinforcements being used for reinforcing the active elements of crusher jaws of pit exploitation equipments in order to increase the reliability and the economical profitability thereof. According to the invention, the reinforcements consist of a matrix made of austenitic-manganese steel alloyed with max. 12% Cr and max. 3% Ni, reinforced in the area of maximum wear, in a ratio of up to 30%, with spheroidal particles having the granulation of 3...10 mm and reinforced, in the areas of medium wear, with layers of NiFe-CW-Ti, NiFe-Cr-CW, FeNi-Cr, Fe-Cr-Ti, Fe-Cr, Fe-CW alloys compatible, upon welding, with the matrix, and deposited as anti-wear intelligent systems of grid, embossed and/or grooved type. As claimed by the invention, the electrode consists of a case of 55%Ni-45%Fe alloy, which contributes by 55% by mass to forming the deposition and a composite core consisting of 80% carburetted Cr, 12% FeTi60, 5% FeSi70 and 3% FeMn45 with a contribution of 45% to the deposition mass. As claimed by the invention, the process consists in carrying out the reinforcement matrix as a rectangular plate with the dimensions of 1000 x 250 x 100 mm, antigravitationally cast into a mould made of quartz sand, of steel of the Fe-14%Mn-3%Ni-2%Cr type, onto the reinforcements of 6 mm, uniformly pre-positioned in the central area in a ceramic mass with 44% marble, 40% fluorine, 16% rutile, at a pressure of 3.5 at, the cooling speed being of min. 300°C/h and the homogenization temperature of 1500°C, the cooling and the solidification taking place at a rate of min. 300°C/h, followed by cleaning the plate up to metallic lustre and build-up welding in two carbon-rich layers, the first with NiFe-30%Cr alloy and the second with Fe-30%Cr alloy, the temperature between the rows being of max. 75°C.</p> |
