Development and Modeling of a Robotic Restoration System Based on Laser Directed Energy Deposition

Alya, Sachin; Vundru, Chaitanya; Ankamreddy, Bhargavi; Birla, Sandesh; Singh, Ramesh

doi:10.1007/s12666-020-02151-z

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…As well as the penetration depth, the dilution is an important quality indicator for the DED process [40,41]. If the value is too low, there is a high probability of insufficient melting of the previous layer accompanied with lack of penetration and LoF.…”

Section: Dilutionmentioning

confidence: 99%

Hot-Wire Laser-Directed Energy Deposition: Process Characteristics and Benefits of Resistive Pre-Heating of the Feedstock Wire

Kisielewicz

Pandian

Sthen

et al. 2021

Metals

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This study investigates the influence of resistive pre-heating of the feedstock wire (here called hot-wire) on the stability of laser-directed energy deposition of Duplex stainless steel. Data acquired online during depositions as well as metallographic investigations revealed the process characteristic and its stability window. The online data, such as electrical signals in the pre-heating circuit and images captured from side-view of the process interaction zone gave insight on the metal transfer between the molten wire and the melt pool. The results show that the characteristics of the process, like laser-wire and wire-melt pool interaction, vary depending on the level of the wire pre-heating. In addition, application of two independent energy sources, laser beam and electrical power, allows fine-tuning of the heat input and increases penetration depth, with little influence on the height and width of the beads. This allows for better process stability as well as elimination of lack of fusion defects. Electrical signals measured in the hot-wire circuit indicate the process stability such that the resistive pre-heating can be used for in-process monitoring. The conclusion is that the resistive pre-heating gives additional means for controlling the stability and the heat input of the laser-directed energy deposition.

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Section: Dilutionmentioning

confidence: 99%