Influence of Surface Roughness on Selected Geometric Characteristics of Laser Beam Welded Joints of AW 2099 Alloy

Šugra Filip (), Marônek Milan (), Bárta Jozef (), Lopatková Michaela () and Mičian Miloš ()
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Šugra Filip: Slovak University Of Technology, In Bratislava Faculty Of Materials Science And Technology In Trnava Institute Of Production TechnologiesUlica Jána Bottu 2781/25, 917 24 Trnava, Slovak Republic
Marônek Milan: Slovak University Of Technology, In Bratislava Faculty Of Materials Science And Technology In Trnava Institute Of Production TechnologiesUlica Jána Bottu 2781/25, 917 24 Trnava, Slovak Republic
Bárta Jozef: Slovak University Of Technology, In Bratislava Faculty Of Materials Science And Technology In Trnava Institute Of Production TechnologiesUlica Jána Bottu 2781/25, 917 24 Trnava, Slovak Republic
Lopatková Michaela: Slovak University Of Technology, In Bratislava Faculty Of Materials Science And Technology In Trnava Institute Of Production TechnologiesUlica Jána Bottu 2781/25, 917 24 Trnava, Slovak Republic
Mičian Miloš: Faculty Of Mechanical Engineering Department Of Technological EngineeringUniverzitná 8215/1, 010 26 Žilina, Slovak Republic

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2020, vol. 28, issue 47, 56-64

Abstract: Al-Li alloys are used in various industries owing to their good mechanical and physical properties. However, one of the limiting factors of welding the aluminium alloys by laser beam is the high reflectivity of the beam and thus the reduced efficiency of the laser. Reduction of reflectivity can be achieved by increasing the surface roughness, which may have a beneficial effect on the absorption of the laser, resulting into affecting the weld bead dimensions. The paper deals with the analysis of the influence of surface roughness of welded materials on geometry of welded joints. Specimens of AW 2099 alloy 2099 with a thickness of 3 mm were milled to achieve different levels of roughness, and then laser welded. Characteristic dimensions of the welds (weld surface/root width) were measured. The obtained data were statistically analysed using the ANOVA method, in order to assess statistical significance of the influence of individual roughness parameters on the geometric characteristics of welds. The results of the analysis showed that, within the monitored range and surface roughness parameters, only the influence of roughness parameter Rq, Rz on the weld root width can be considered statistically significant.

Keywords: Laser welding; AW 2099; geometric characteristics; ANOVA (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:vrs:repfms:v:28:y:2020:i:47:p:56-64:n:7

DOI: 10.2478/rput-2020-0019

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