Perspective Method of Restoration of Autotractor Parts by Electrocontact Welding of Powder Materials in the Magnetic Field

The cause of the failures of autotractor machines is mainly the process of inevitable wear of the mating parts. Moreover, it was proved that more than 80 % of parts of assemblies and assemblies of many tractors and cars fail with a slight wear of parts, sometimes not exceeding 0.1 mm. One of the progressive ways of restoration with obvious advantages compared with other similar methods of repairing parts is electrocontact welding of filler materials. One of the ways to expand the capabilities of technology is the application of metallic powder materials and their mixtures on the worn surfaces of automotive components in the magnetic field. Conducted research and obtained a number of results to determine the effectiveness of using the technology of contact welding of powder materials in a magnetic field. The optimal geometrical parameters of the electromagnetic device (d/2L=2,8) are determined with the smallest value of the magnetomotive force (F=1,2510-3 А). The influence of the current of the excitation winding of the electromagnet on the thickness of the formed coating up to 1.5 mm or more is proved. The possibility of applying (welding) steel and cast iron chips with particle sizes from 400 to 1000 microns and controlling the thickness of the applied layer, changing the magnetic field and particle size of the chips was determined. In this case, it is possible to obtain a layer thickness of up to 1.6 mm. Tests on the wear of the samples showed high wear resistance of the welded coatings obtained in comparison with the reference steel samples.