Matjaž Kotar (Author), Makoto Fujishima (Author), Gideon N. Levy (Author), Edvard Govekar (Author)

Abstract

This paper experimentally studies the influence of conventional process parameters (laser beam power, P, workpiece, and wire feeding velocities), and the nominal workpiece irradiation proportion WIPN parameter, on ALB-WC process stability and generated clad geometry. The study was based on an extensive set of single clad experiments using stainless steel AISI 316L wire of 0.6 mm diameter and a stainless steel AISI 304 workpiece. The results show that the laser beam power required for a stable process increases non-linearly with WIPN, and this relationship can be described by quadratic regression. An increase in either the workpiece or wire feeding velocity respectively causes a reduction or enlargement of the stability region in the P-WIPN stability diagrams. The influences on stability diagrams are explained by means of the increase in the nominal WIPN to the effective WIPE, as a result of the clad height generated. With respect to clad geometry, it was shown that an increase in the WIPN causes a decrease in the dilution ratio, which is linearly correlated with the workpiece and melt pool temperatures, while clad width and height are not influenced by the WIPN. The paper further explains the complex influences of the process parameters observed on process stability and generated clad geometry using a phenomenological description of the ALB-WC process at a low and high nominal WIPN. For this purpose, heat transfer, Marangoni flow, and laser beam reflections are considered qualitatively and supported by IR and visual images of the wire-end and melt pool as well as the workpiece and melt pool temperatures.

Keywords

annular laser beam;laser wire cladding;nominal workpiece irradiation proportion;process stability;clad geometry;melt pool and workpiece temperature;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 621.9.04(045)
COBISS: 52257539 Link will open in a new window
ISSN: 0924-0136
Views: 317
Downloads: 120
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Other data

Secondary language: Slovenian
Secondary keywords: anularni laserski žarek;lasersko nanašanje žice;imenski delež osvetljevanja obdelovanca;stabilnost procesa;geometrija nanosa;temperatura talilnega bazena in obdelovanca;
Type (COBISS): Article
Pages: str. 1-12
Issue: ǂVol. ǂ294
Chronology: Aug. 2021
DOI: 10.1016/j.jmatprotec.2021.117105
ID: 12967720