TY - JOUR

T1 - Theoretical analysis of the coincident wire-powder laser deposition process

AU - Pinkerton, Andrew J.

AU - Syed, Waheed Ul Haq

AU - Li, Lin

PY - 2007/12

Y1 - 2007/12

N2 - The process of coincident wire and powder deposition by laser has recently emerged in research work as a, layered manufacturing method with a higher deposition rate than the established laser direct metal deposition technique and as a means of creating functionally graded metallic surface layers in a single pass. This work analytically models the process by accounting for the incoming wire and powder as virtual negative heat sources. The major assumptions of the model are confirmed experimentally and the predicted temperature profiles compared with values measured using contact and pyrometric methods. Model accuracy outside the molten zone is excellent, but this solution does not account for latent heat and intrapool circulation effects so it gives only moderate precision when extrapolated to within the melt pool. Increasing the mass feed rate to the melt pool reduces its depth and the temperature surrounding it-these effects can be quantified in three dimensions by the model.

AB - The process of coincident wire and powder deposition by laser has recently emerged in research work as a, layered manufacturing method with a higher deposition rate than the established laser direct metal deposition technique and as a means of creating functionally graded metallic surface layers in a single pass. This work analytically models the process by accounting for the incoming wire and powder as virtual negative heat sources. The major assumptions of the model are confirmed experimentally and the predicted temperature profiles compared with values measured using contact and pyrometric methods. Model accuracy outside the molten zone is excellent, but this solution does not account for latent heat and intrapool circulation effects so it gives only moderate precision when extrapolated to within the melt pool. Increasing the mass feed rate to the melt pool reduces its depth and the temperature surrounding it-these effects can be quantified in three dimensions by the model.

KW - laser deposition

KW - layered manufacturing

KW - functionally graded materials

KW - powders

KW - wires

KW - powder technology

U2 - 10.1115/1.2752828

DO - 10.1115/1.2752828

M3 - Journal article

VL - 129

SP - 1019

EP - 1027

JO - Journal of Manufacturing Science and Engineering

JF - Journal of Manufacturing Science and Engineering

SN - 1087-1357

IS - 6

ER -