PhD Studentship Production Technology - Simulation and control of laser-wire additive manufacturing

University West
September 27 2017
Position Type
Full Time
Organization Type

The research team Production Technology West has, among other things, a long experience in modelling of welding physics, and in automation of laser technology for additive manufacturing. This includes arc and laser welding process simulation, design and integration of sensor systems, development of appropriate models for in-process monitoring and simulation-assisted process control with the aim to obtain desired properties of additively built components.

This doctoral student position is in the fields of process physics, process simulation, in-process monitoring and simulation-assisted control of additive manufacturing of titanium and steel alloys using laser and wire. This research work thus belongs to additive manufacturing using direct energy deposition. Since the temperature history during deposition determines the properties of the built component, strong emphasis will be put on gaining process knowledge via simulation of the laser-wire-material interaction along the deposition. This knowledge will aim, among others, at understanding how and where to robustly measure temperature during the process. In addition, the built geometry also needs to be continuously measured. These measurements will be input parameters to the model to be developed for in-process monitoring and simulation-assisted process control to obtain stable process and desired geometry. Other important issues are related to avoiding process induced defects such as pores and lack of fusion between layers in the build. The research is application-oriented and conducted in close collaboration with industry.

The scientific work in the project

The project aims at better understanding the relationships between properties that can be measured during material deposition and how these properties influence the process stability and the built component properties. The project combines a physical approach with a mechatronic approach. It covers process physics understanding (heat transfer, metal melting, flow and solidification), as well as both system integration of sensors and design of control actuation in a laser processing cell. This is associated with process computational simulation, signal processing, algorithmic development and experimental validation of the results. The work will be also coordinated with material scientists to bridge the gap between the in-process control and the structural integrity of a final build.

Job description: The research program includes, in addition to participation in third-cycle courses and other activities, implementation of an independent thesis work. PhD students shall primarily devote themselves to their own education. A PhD student may, however, be engaged to a limited extent in education, research and administration, mainly within Production Technology. Such duties, before a PhD has been conferred, may not occupy more than 20 per cent of full-time working hours. (Higher Education Ordinance (SFS 1993:100) Chapter 5 section 2).

This job comes from a partnership with Science Magazine and Euraxess

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