Effect of continuous and pulsed current techniques on wire-arc additive manufacturing of a nickel-based superalloy

In this research, the Hastelloy C-276 thick wall component was successfully fabricated using wire arc additive manufacturing (WAAM) with both continuous current (CC) and pulsed current (PC) techniques. A defect-free components produced from appropriate process parameters. The CC-WAAM exhibits equiaxed structure in top and columnar in middle and bottom layers. PC-WAAM has fine-equiaxed and cellular structure. The controlled heat input from arc pulsing mode minimized elemental segregation between inter-dendritic and dendritic core regions. CC-WAAM wall have a maximum average grain size of 223.7 mu m, while PC-WAAM wall have 189.2 mu m. PC-WAAM has higher strength, hardness, and ductility than CC-WAAM. This paper presented a better gas tungsten arc welding (GTAW) based WAAM technique for industrial component manufacturing based on Has-telloy C-276 microstructure and mechanical integrity tests.

Automated summary

In this research, Hastelloy C-276 thick wall component was successfully fabricated using wire arc additive manufacturing (WAAM) with both continuous current (CC) and pulsed current (PC) techniques. The defect-free components were produced from appropriate process parameters. The CC-WAAM exhibited an equiaxed structure in the top and columnar structure in the middle and bottom layers. The PC-WAAM had a fine-equiaxed and cellular structure. The controlled heat input from the arc pulsing mode minimized elemental segregation between the inter-dendritic and dendritic core regions. The CC-WAAM wall had a maximum average grain size of 223.7 μm, while the PC-WAAM wall had 189.2 μm. The PC-WAAM had higher strength, hardness, and ductility than the CC-WAAM. This paper presented a better gas tungsten arc welding (GTAW)-based WAAM technique for industrial component manufacturing based on Hastelloy C-276 microstructure and mechanical integrity tests.