Isabelle Choquet

Coupling boundary condition for high-intensity electric arc attached on a non-homogeneous refractory cathode

The boundarycoupling high-intensity electricarc and refractory cathode is characterized bythree sub- layers: the cathode sheath,the Knudsen layeran...

Gas tungsten arc models including the physics of the cathode layer : remaining issues

A recent review pointed out that the existing models for gas tungsten arc coupling the electrode (a cathode) and the plasma are not yet complete...

Incubation during laser ablation with bursts of femtosecond pulses with picosecond delays

Abstract: We report on an experimental investigation of the incubation effect during irradiation of stainless steel with bursts of ultrashort laser...

Incubation effect in burst mode fs-laser ablation of stainless steel samples

We report on an experimental study of the incubation effect during irradiation of stainless steel targets with bursts of femtosecond laser pulses a...

Modelling of thermal fluid dynamics for fusion welding

A fluid dynamics approach to modelling of fusion welding in titanium alloys is proposed. The model considers the temporal and spatial evolution of...

A novel arc heat treatment technique for producing graded microstructures through controlled temperature gradients

This paper introduces a novel arc heat treatment technique to produce samples with graded microstructures through the application of controlled...

Main issues for a fully predictive plasma spray torch model and numerical considerations

Plasma spray is one of the most versatile and established techniques for the deposition of thick coatings that provide functional surfaces to prote...

A critical analysis of weld heat input measurement through a water-cooled stationary anode calorimeter

Comprehensive models of heat transfer require specification of the total amount of heat received by the workpiece. The objective of this work was t...

A Multi-scale Multi-physics Approach to Modelling of Additive Manufacturing in Nickel-based Superalloys

A multi-scale, multi-physics modelling framework of selective laser melting (SLM) in the nickel-based superalloy IN718 is presented. Representative...

A predictive model for gas tungsten arc heat source

Gas tungsten arcs are used as heat sources in production processes such as welding and metal deposition.However, the most advanced of the existing...

A review of cathode-arc coupling modeling in GTAW

Material properties of welds are strongly influenced by the thermal history, including the thermo-fluid and electromagnetic phenomena in the weld...

Coupling boundary condition for high-intensity electricarc attached on a non-homogeneous refractory cathode

Effect of cathode model on arc attachment for short high-intensity arc on a refractory cathode

Various models coupling the refractory cathode, the cathode sheath and the arc at atmospheric pressure exist. They assume a homogeneous cathode wit...

Fundamental mode of freely decaying laminar swirling flows

Abstract A detailed study of a swirling flow in a tube is presented in the first part of the paper. A simplified analytical solution of the governi...

A critical analysis of weld heat input measurement through a water-cooled stationary anode calorimeter

A comprehensive model on heat transfer in welded plates is able to calculate the amount of heat losses from the surfaces. A model demands as input...

Design of a device to induce swirling flow in pipes : A rational approach

In this study, a rational approach is proposed to design a device for inducing swirling flow in heat exchanger pipes, for improved efficiency in th...

Laser Welding Process : A  Review of Keyhole Welding Modelling

Laser welding is used in several industrial applications. It can be distinguished between conduction mode and keyhole mode welding, between pulsed...

Analysis of the Influence of the Composition of the Shielding Gas on Pressure Force and Heat Fluxes in Arc Welding

A main problem raised by arc welding manufacturing is the determination ofthe optimal process parameters to ensure weld quality as well as resource...

Modelling of electrode-arc coupling in electric arc welding

Modelling of the arc in electric arc welding is significant to achieve a better pro-cess understanding, thus gain better weld quality and a more...

Discussion sur les différentes formulations des équations de l´énergie dans les modèles de plasmas thermiques à deux températures

Pour modéliser un plasma thermique à deux températures, les travaux de la littérature proposent en général de résoudre une équation pour l’énergie...

Improvement of a pseudo kinetic method for the calculation of a two-temperature thermal plasma composition

This paper proposes an improved Saha law for calculating the 2T composition of an Argon thermal plasma. This law is based on a simplified kinetic...

Magnetic field models for high intensity arcs, applied to welding : A comparison between three different formulations

Most simulation studies done to deeper understand high-intensity welding arcs address axi-symmetric configurations and use the electric potential...

Numerical modelling of shielding gas flow and heat transfer in laser welding process

In the present work a three-dimensional model has been developed to study shieldinggas flow and heat transfer in a laser welding process using...

On the choice of electromagnetic model for shorthigh-intensity arcs, applied to welding

Four different approaches were considered for modelling the electromagneticfields of high-intensity electric arcs: i) the three-dimensional model,...

Review of Arc Efficiency Values for Gas Tungsten Arc Welding

The aim of this study was to review the literature that specifies arc efficiency values for gas tungsten arc welding (GTAW) and, if possible, propo...

Electric welding arc modeling with the three-dimensional solver OpenFOAM : A comparison of different electromagnetic models

This study focuses on the modeling of a plasma arc heat source in the context ofelectric arc welding. The model was implemented in the open source...

Implementation of a 3D solver for electric arc welding, coupling fluid mechanics with electromagentics

This paper describes the implementation of a 3D numerical solver for electric arc welding, where the fluid mechanics of the shielding gas is strong...

Modeling and simulation of a heat source in electric arc welding

This study focused on the modeling and simulation of a plasma heat source applied toelectric arc welding. The heat source was modeled in three spac...

Non equilibrium ionization in magnetized two-temperature thermal plasma

A thermal plasma is studied accounting for both impact ionization, and an electromagnetic field. This plasma problem is modeled based on a system o...

Numerical simulation of Ar-x%CO2 shielding gas and its effect on an electric welding arc

This study focuses on the simulation of a plasma arc heat source in the context of electric arc welding. The simulation model was implemented in th...

A strong ionization model in plasma physics

A hierarchy of diffusion models for partially ionized plasmas

Partially ionized plasmas corresponding to different ionization degrees are derived and connected one with each other by the diffusion approximatio...

Clogging and lump formation during atmospheric plasma spraying with powder injection downstream the plasma gun

This study aimed to numerically and experimentally investigate lump formation during atmospheric plasma spraying with powder injection downstream t...

Numerical and Experimental Study of Ni-Particle Impact On A Ti-Surface

Hydrodynamic limit for an arc discharge at atmospheric pressure

In this paper we study a partially ionized plasma that corresponds to an arc discharge at atmospheric pressure. We derive an inviscid hydrodynamic/...

New powder port holder geometry to avoid lump formation in APS

A new geometry of the powder port ring holder used in atmospheric plasma spraying has recently been designed to avoid lump formation, and...

Nozzle exit geometry and lump formation in atmospheric plasma spraying

Plasma spraying operations performed with high carrier gas flow rate may improve the coating properties but they can also lead to lump formation an...

Deposition Rate Increase in APS Processes by Means of Multiple Injection Ports

Numerical and experimental study of Ni-particle impact on a ti-surface