Hardfacing of mild steel with wear-resistant Ni-based powders containing tungsten carbide particles using powder plasma transferred arc welding technology

Abstract This study explores the use of powder plasma transferred arc welding (PPTAW) as a surface layer deposition technology to form hardfaced coatings improve upon wear resistance mild steel. Hardfaced layers 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, penetration tests, hardness abrasive tests carried out on samples. Hardfacings had 46.3–48.3 HRC, while those 52.7–58.3 HRC. The microhardness matrix material was in range 573.3–893.0 HV, that carbides 2128.7–2436.3 HV. steel improved after by up 5.7 times abrasion-resistant heat-treated steel, Hardox 400, having nominal approximately 400 increased addition Cr an alloying element. Increasing PGFR hardfacings, well increasing number cracks. (PTA) current resulted hardfacings fewer cracks but lowered resistance.