A process efficiency comparison of Nd:YAG and CO2 laser cladding

Gedda, Hans; Powell, John; Kaplan, Alexander

doi:10.2351/1.5066172

Cited by 4 publications

(2 citation statements)

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“…Energy is conveyed from the melt pool by various pathways [25,26,44], which are considered in turn. The rate of heat¯ow due to conduction, convection, radiation and vaporization are represented by Q 1 , Q 2 , Q 3 and Q 4 respectively.…”

Section: Energy¯ow From the Melt Poolmentioning

confidence: 99%

“…Gedda et al [17] estimated the energy redistribution during the complete DMD process, using a combination of experimental and simple theoretical methods. Other work by Gedda et al [18] used the same methods to compare CO 2 and Nd:YAG cladding, concluding that the latter was up to twice as e cient. In this work, a new energy balance model is created to demonstrate the e ect of the coupling e ciency on the DMD process.…”

Section: Introductionmentioning

confidence: 96%

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An analytical model of energy distribution in laser direct metal deposition

Pinkerton

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

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The direct metal deposition (DMD) process is suitable for functional rapid prototyping, rapid tooling and part refurbishment, and can be operated with CO2, Nd:YAG (neodymium-doped yttrium aluminium garnet) or high-power diode lasers. In this work, a quasi-stationary coaxial DMD system is modelled in terms of power balances. Novel modelling methods and matching to experimental results are used to derive a series of equations, from which the power distribution, melt pool length and mean melt pool temperature can be derived for different initial laser powers, system parameters and build material properties. The model is applied to a real system and predicts results in agreement with established values. The model highlights laser radiation reflection from the melt pool and conduction to the substrate as the major power distribution routes and reveals the importance of evaporation losses from the melt pool at higher laser powers. Application of the model is able to explain some of the differences in the process found when using alternative types of lasers as the power source.

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Section: Energy¯ow From the Melt Poolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%