Hardfacing of mild steel with wear-resistant Ni-based powders containing WC particles using PPTAW technology

This study explores the use of powder plasma transferred arc welding (PPTAW) as a surface layers deposition technology to form hardfaced coatings improve upon wear resistance non-alloy structural steel. Hardfaced layers/coatings were prepared using PPTAW process with two different wear-resistant powders: PG 6503 (NiSiB+60% WC) and PE 8214 (NiCrSiB+45% WC). By varying parameters gas flow rate (PGFR) current, prepared. Microscopic examinations carried out ascertain information about microstructure characteristics layers. Penetration tests performed number depth crack sites in samples by visual inspection. Hardness also determine microhardness Abrasive on each sample their relative abrasive reference material, abrasion resistant heat-treated steel having nominal hardness 400 HBW. The effects variations PGFR current mechanical properties coatings, mechanisms discussed.