Microstructure and Wear Resistance of Hard-Facing Weld Metal on JIS-S50C Carbon Steel in Agricultural Machine Parts

Abstract

Hard-facing welding is one of the repairing methods for increasing hard metal on the agricultural machine part surfaces that caused by the wear mechanism. To this date, the investigation of an optimized welding process parameter that could produce high hardness and wear resistance of the hard-facing layer is still being developed and performed. This paper aims to study the effects of hard-facing welding layer on mechanical properties and microstructure of hard-facing weld metal on JIS-50C carbon steel. The summarized results are as follows: (a) an increase of hard-facing layer affected to increase the hardness of the layer, (b) the hardness of the welds showed a maximum hardness of about 750 HV at a top surface of 3rd welds layers with no-buffering layer and showed the minimum hardness of about 225 HV at a base metal, (c) microstructure investigation showed that the increase of the phase that contained higher chromium, molybdenum and manganese affected the increase of the hardness and the wear resistance of the weld metal, (d) The minimum mass loss of 0.2559 mg/m could be found when a welding current of 100A, non-buffering layer and 3 layers of hard-facing weld metal were applied, and (e) the buffering layer was able to produce a sound weld metal and might not be suited for the hard-facing welding of the medium carbon steel because it produced the dilution effect that deteriorated the mechanical properties of the weld metal.

TIG Overlap Welding Affecting Hard-Faced Weld Metal Properties on JIS-S50C Carbon Steel

“…6 shows the bead geometries measurement results of 1 welding bead on a steel surface that showed an increase in the welding current, which increased the weld bead width (x1) and the weld penetration (y2) but decreased the weld bead convex (y1). When compared with a gas metal arc welding (GMAW) [12] for producing high-chromium hard-faced weld metal, the increase of the weld bead width and the penetration when the heat input was increased were not different, but the weld bead convex using the TIG welding technique produced a lower weld-bead convex than that of GMAW. Fig.…”

Interpass Temperature Affecting Abrasive Wear Resistance of SMAW Hard-Faced Weld Metal on JIS-S50C Carbon Steel

“…10. Furthermore, the higher interpass temperature affected to decrease the reinforced elements on the surface and decrease the wear resistance due to the low possibility to form the metal carbide in the weld metal [2,11,17].…”

“…Another effect might be a dilution effect of the hard-faced electrode composition. A diluted composition showed that the weld metal contained lower reinforced alloy required for increasing hardness and strength of the weld metal [2,11,12].…”

“…Welding repair of industrial or agricultural machinery parts was able to perform using a hard-faced welding technique [1,2]. This technique already showed an improvement of mechanical properties such as hardness and wear resistance of the metal surface and might show low operation cost when compared with other hard-face layer [3].…”

Immersion Behavior of Carbon Steel, Phosphate Carbon Steel and Phosphate and Painted Carbon Steel in Saltwater

“…Carbon steels, due to their good mechanical properties [ 1 ], as well as their possibility to be processed (welded [ 2 ], chipped [ 3 ], deformed [ 4 ]), are a suitable choice for use in the manufacture of machine parts [ 5 ], accessories of fall arrest systems (e.g., carabiners, hooks, and pythons) [ 6 , 7 ], vehicle bodies [ 8 ], shipbuilding [ 9 ], or in use in buildings, bridges, rails, pipes, [ 10 ] etc.…”