Weld bead modeling and process optimization in Hybrid Layered Manufacturing

Hybrid Layered Manufacturing is a Rapid Manufacturing process in which the metallic object is built in layers using weld deposition. Each layer built through overlapping beads is face milled to remove the scales and scallops and ensure Z-accuracy. The formations of single beads and overlapping multiple beads are modeled in this paper. While the individual bead’s geometry is influenced by the size of the filler wire and the speeds of the wire and torch, the step over increment between the consecutive beads additionally comes into the picture for the multiple bead deposition. These models were validated experimentally. They are useful not only to predict the bead’s shape but also to optimize the three process parameters.

Research highlights► HLM a judicious combination of additive and subtractive methods. ► Modeling of metal deposition for single-bead geometry. ► Extension of the single-bead model for multiple-bead deposition. ► Experimental validation of the proposed models. ► Results useful for optimization of the process parameters.