| About this Abstract |
| Meeting |
2023 AWS Professional Program
|
| Symposium
|
2023 AWS Professional Program
|
| Presentation Title |
Estimation of Bead Size and Catchment Efficiency in Laser Cladding |
| Author(s) |
Nitheesh Kumar R, Gentry Wood, Lu Yi, Patricio F. Mendez |
| On-Site Speaker (Planned) |
Nitheesh Kumar R |
| Abstract Scope |
The geometry of the clad bead in a laser cladding procedure is critical in determining necessary information such as the number of overlapping beads required to coat entire surfaces and the number of layer-on-layer passes to target a specific thickness. Prediction of the geometry and dimensions of the clad bead in a laser cladding procedure is important to ensure dimensional accuracy and efficient functionality. Practical expressions for the prediction of these dimensions can reduce the burden of expertise and save time involved with the usage of numerical models among practitioners.
This study discusses mathematical expressions developed through analytical modeling based on Rosenthal’s solutions for estimating the width, height, and catchment efficiency of clad beads from information on known process parameters for a laser cladding operation. Effective thermo-physical properties of the substrate are determined to consider their variation with temperature which is often overlooked. An expression for the thermal efficiency of the cladding process taking into account the shadowing effect of the powder cloud is proposed. An improved analytical estimation of catchment efficiency based on proper integration of mass flow over the surface of the weld pool is introduced, assuming a gaussian distribution for the laser power and the powder flow with the same distribution parameters.
The error of predictions on width and catchment efficiency is within the range of ± 10%, except for the cases of the low power and higher travel speed domains where a large deviation is observed. Predictions made on the height of the bead are greater than the measured height for every case by an average of 18%. In calculating catchment efficiency, the fraction of powders falling on and ahead of the melt pool is calculated and the results reveal that the fraction falling ahead of the melt pool is negligible and doesn’t contribute to the catchment. |
| Proceedings Inclusion? |
Undecided |