On the Influence of Heat Input on Ni-WC GMAW Hardfaced Coating Properties

Abstract

Hardfacing is one of the techniques used for part lifecycle elongation. Despite being used for over 100 years, there still is much to discover, as modern metallurgy provides more and more sophisticated alloys, which then have to be studied to find the best technological parameters in order to fully utilize complex material properties. One of the most efficient and versatile hardfacing approaches is Gas Metal Arc Welding technology (GMAW) and its cored-wire equivalent, known as FCAW (Flux-Cored/Cored Arc Welding). In this paper, the authors study the influence of heat input on the geometrical properties and hardness of stringer weld beads fabricated from cored wire consisting of macrocrystalline tungsten carbides in a nickel matrix. The aim is to establish a set of parameters which allow to manufacture wear-resistant overlays with high deposition rates, preserving all possible benefits of this heterogenic material. This study shows, that for a given diameter of the Ni-WC wire, there exists an upper limit of heat input beyond which the tungsten carbide crystals may exhibit undesired segregation at the root.

Prediction of phase composition and mechanical properties Fe–Cr–C–B–Ti–Cu hardfacing alloys: Modeling and experimental Validations

“…Of the different surfacing techniques, hardface welding has the greatest mobility, process flexibility, and thickness-building ability [ 38 ]. The following welding techniques are widely implemented in practice [ 39 , 40 ]: shielded metal arc welding (SMAW) [ 41 , 42 ], gas tungsten arc welding (GTAW [ 43 , 44 ] or TIG) [ 45 , 46 ], gas metal arc welding (GMAW or MIG), submerged arc welding (SAW), manual metal arc welding (MMA or MMAW) and flux-cored arc welding (FCAW) [ 2 , 14 , [47] , [48] , [49] , [50] , [51] ]. Self-shielded flux-cored wires arc welding (FCAW–S) is more environmentally friendly and more energy efficiency [ 52 ], higher productivity, high quality of the deposited metal, high deposition rate, arc visibility [ 41 , 48 , 49 ].…”