Análisis de la dureza y templabilidad en un disco estándar de arado mediante el desarrollo de un proceso de soldadura específico

Abstract

This work analyzed the hardness and hardenability of a standard plow disk through the development of a specific welding process. The purpose was to recover the worn plow disks through a bibliographic, comparative research methodology and laboratory tests. The hardness and hardenability properties were analyzed. Spectrometry, microstructure, hardness and Jominy tests were implemented, in identified specimens of the AISI/SAE 1340 material according to the spectrometry analysis and from worn discs, repaired by welding and new ones. In the repair of the plow disc. Two SMAW welding processes were analyzed that were adapted in various points from the AWS D1.1 and D14.3 standard; recovery of the standard diameter of the disc and welding with mesh-type overlay. The first process was defined in a simple bevel overlap joint, using E6011 electrodes in the root pass and E6013 in the filling, in such a way that the original diameter of 22 and 24 inches was recovered with the conservation of the standard hardness. In the second welding process, the mesh was carried out on the welded fragments with the E7018 electrodes in order to prolong the useful life of the welded pieces, since the weld bead will be directly exposed to wear. The laboratory tests allowed to determine if the properties of the plow discs repaired by welding have improved and they can be inserted again in the field work. Through the contrast of bilateral hypotheses, it was determined that the average hardness of the repaired disc is in the acceptance zone, affirming that the recovery of a standard plow disc by welding improves the hardness and hardenability in the wear zone.