Technologies and materials for the renovation of erosion-worn parts of automobile equipment

Abstract

The article presents the results of the development of a technological method and equipment for the renovation of erosion-worn parts of automotive equipment. In the parts of machines and mechanisms subjected to mechanochemical wear, thin-sheet steel, the specific weight of which in car structures is on average 80%, is especially destroyed, as well as the working organs of machines: threaded joints, welding seams, internal friction surfaces (hubs, bearings, rollers and etc.). The solution to this problem is simplified when surface surfacing is used and it is possible to obtain a relatively flat surface with good separation of the slag crust without sharp height differences in the overlapping area.For welding wear-resistant and corrosion-resistant layers, it is necessary to use wires with a diameter of up to 2 mm, which allow applying thin layers of steel alloyed mainly with Cr, Ni, Mn, Mo during arc welding. The welding of such steels to ensure high quality of the deposited layers from the point of view of achieving high corrosion resistance is quite difficult. This is due to the fact that during the operation of welded parts and even when they are kept for a long time before operation, stripes with low corrosion resistance appear on the welded surface (dark colors on the polished surface of the working layer). In the process of developing the technology of surfacing the surface of worn parts, powders of ultra-fine particles were developed, which were used to fill the core of powder-coated wires with diameters of 1,6 and 2,2 mm. The composition of the charge included exotic additives, in particular chromium, molybdenum and complex liquid and alkaline earth ligatures, in particular yttrium and cerium, which made it possible to significantly increase the wear resistance of the deposited layer.

Keywords

• surfacing, corrosion, wear, modification, alloying, structure