In mining industry structural machinery parts are primarily exposed high wear. Sand, stones or wood are processed, leading to a significant abrasion of tools and surrounded parts with progressive loss of mass and further failure. To increase the service life and protect such components, sacrificial welded hard facing layers are applied and renewed after abrasive material removal. Such welded alloys are characterized with high hardness and accordingly good suitability against abrasive wear. Additional, some specific tools are exposed to high loads, because of cutting or lifting during the mining process.
In this work different hardfacing alloys are investigated. Therefore, a self-designed abrasion test rig following the test standard ASTM B611 incorporating rotating steel wheel as counterpart between the specimen and the abrasive sand is utilized for wear characterization. To investigate the applicability of hard facing layers under mechanical fatigue loading, a four point bending test rig enabling experimental analysis with the same specimen geometry is realized. Fatigue tests cover the effect of different welding parameters and the influence of the end-of-seam areas on the final life time. The results demonstrate a decrease up to 45 % of fatigue strength in comparison to the unwelded base material S355, but on contrary a higher abrasion resistance of such hardfacing alloys is provided in order to protect the more valuable machinery parts and to achieve durability of the components.