Applying Multi-Criteria Approaches to the Weld Bead Geometry Problem in Laser Welding With Filler Wire Process Using the Al-Mg-Mn-Zr-Er Alloy Sheet

doi: 10.14456/mijet.2022.19


  • Kenechukwu Obinna Okponyia University of Lagos
  • Sunday Ayoola Oke University of Lagos
  • Akwaeno Uduak Umoh University of Lagos


Laser welding, selection, process parameters, multicriteria analysis


Al-Mg-Mn-Zr-Er alloy sheet is a prominent industrial material used by the automotive and aerospace industries. Yet little is known about which parameters substantially affect the weld bead geometry in laser welding. This article establishes the most influential process parameters in laser welding with filler wire process on the Al-Mg-Mn-Zr-Er alloy sheets focusing on laser power, welding speed, wire feed speed parameters. The data obtained from a paper was used for analysis. Five methods were compared, namely analytic hierarchy process (AHP) method, fuzzy analytic hierarchy process (FAHP) method, best-worst method, entropy method and criteria importance through inter-criteria correlation (CRITIC) method. The arithmetic mean (AM) method and the root mean square (RMS) method were used to compare the results of the five methods. Using the AM method, the FAHP method is the best (AM, 0.3367), the entropy method is the second position (AM, 0.3337) and the three methods of AHP, best worst and CRITIC (AM, 0.3333 each) were placed in the third position. Besides, for the RMS method, the entropy and FAHP methods were the first and second positions with the RMS values of 0.2094 and 0.1954, respectively. The third to the last positions were allocated to best worst (RMS, 0.1948), AHP (RMS, 0.1894) and CRITIC (RMS, 0.1274), respectively. Consequently, the FAHP method is the best and recommended to develop cost reduction strategies in the workshop. The novelty of this article is the application of five multicriteria methods, namely AHP, FAHP, best-worst, entropy and CRITIC to the Al-Mg-Mn-Zr-Er alloy sheets.


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Author Biographies

Kenechukwu Obinna Okponyia, University of Lagos

Department of Mechanical Engineering, University of Lagos, Lagos, Nigeria

Sunday Ayoola Oke, University of Lagos

Department of Mechanical Engineering, University of Lagos, Lagos, Nigeria

Akwaeno Uduak Umoh, University of Lagos

Department of Mechanical Engineering, University of Lagos, Lagos, Nigeria


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