Laser cladding using high-power diode lasers

Nowotny, Steffen; Richter, Anne; Beyer, Eckhard

doi:10.2351/1.5059205

Cited by 17 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, assuming that all the powder that impacts the melt pool is absorbed (assumption 9), a proportionate increase in new material assimilation would be produced. This explains the greater track thicknesses and build rates that are achieved when using a HPDL for DMD [12,13].…”

Section: Model Application and Discussionmentioning

confidence: 98%

“…This means that surface radiation coupling e ciency is not a ®xed parameter in DMD, yet changes in it can have a signi®cant e ect on the process. For example, cladding with HPDL lasers (with higher surface absorptivity) can achieve results equivalent to those from much higher power CO 2 or Nd:YAG types [12] and can be 3.6±5 times faster [13], although the depth of the heata ected zone is approximately doubled. It has yet to be shown how the changes in coupling a ect the power distribution within the DMD process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An analytical model of energy distribution in laser direct metal deposition

Pinkerton

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

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.

show abstract

Section: Model Application and Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

An analytical model of energy distribution in laser direct metal deposition

Pinkerton

2004

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…Particular advantages of this method are omnidirectional cladding, better protection from the ambient atmosphere, and relatively small HAZ value. Other advantages of the co-axial powder supply are the controlled heating of the powder before it enters melt pool and the higher powder efficiency [1][2][3][4]. There are approximately 12-14 variables which strongly influence the characteristics of the clad part.…”

Section: Introductionmentioning

confidence: 99%

A Multiphase Approach In Numerical Modeling Of Laser Cladding Process With Coaxial Powder Injection

Kheloufi

Amara²

2008

AIP Conference Proceedings

View full text Add to dashboard Cite

A 3-D transient numerical model based on the numerical resolution of fluid flow and heat transfer equations is developed for laser cladding with powder injection. The numerical study was performed in a co-ordinate system fixed to the base material (Lagrange description) and a moving laser beam with a constant scanning speed. In this study, the Volume Of Fluid (VOL) approach was adopted to deal with the liquid/gas interface boundary conditions. The model enables prediction of temperature field, shape and size of the molten zone, and the geometry of the deposited clad. A simple model for dilution is considered to analyze the clad quality. The effects of powder feed rate on temperature field, clad geometry, dilution factor, maximum temperatures in the melt pool and the heating and cooling rates are investigated.

show abstract

“…Bonek and Dobrzanski (2006) demonstrated that a 0.11 mm thickness of WC cladding on hot-work tool steel (X40CrMoV5) was achieved to increase its wear resistance and heat resistance. Nowotny et al (1998) developed a fairly maximum clad height of 1.2 mm of stellite-6 on mild steel substrate. A feasibility study of HPDDL cladding compared to CO 2 laser cladding was done.…”

Section: Introductionmentioning

confidence: 99%