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Creep and Corrosion Characteristics of Laser Welded AA5083 Al–Mg alloy

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Abstract

In this work, square butt joints were produced on a 3 mm thick AA5083-H111 alloy using Yb:YAG laser welding technique. The creep and corrosion properties of processed welds were determined through the impression creep test and potentio-dynamic polarization method respectively.The results show that,the formation of porosity remained a severe problem in welds processed with longer shielding gas blown distance. Irrespective of other parameters, the longer shielding gas blown distance alone showed a significant impact on porosity formation. However, the weld processed with a higher laser power at moderate welding speed showed a better creep and corrosion properties at all testing conditions. The existence of Nano-sized Al6Mn and Al6(Fe,Mn) intermetallics along with a high density of dislocations improved the creep and corrosion resistance of the weld. On the contrary, the porosities present in the welds lowered pitting potential of weld surface which reduced the width of passive region and, thereby, results in severe corrosion. Interestingly, porosity comprised of a higher concentration of Fe and Mn particles acted as a localized cathode and remained undamaged even after corrosion. This occurrence made the weld comparable with others in corrosion aspects. The creep rate of welds with porositieswas lower than that of other welds.

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The authors declare that all the data supporting the findings of this study are available within the article.

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Acknowledgements

The authors would like to express their most profound appreciation and sincere thanks to the Department of Science and Technology—Science and Engineering Research Board (DST-SERB), New Delhi, India, for financially supporting this entire research work, under the sponsored research project sanctioned No.SB/EMEQ-168/2014, dated 29-01-2016.

Funding

This work was supported by Department of Science and Technology—Science and Engineering Research Board (DST-SERB), New Delhi, India. (Project grants No.SB/EMEQ-168/2014, dated 29–01-2016).

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Authors and Affiliations

  1. Department of Mechanical Engineering, SRM TRP Engineering College, Tiruchirappalli, Tamilnadu, India, 621105

    Mustafa Umar

  2. Department of Mechanical Engineering, Vignan’s Lara Institute of Technology & Science, Guntur, Andhra Pradesh, India, 522213

    M. Mohammed Asif

  3. Department of Production Engineering, National Institute of Technology, Tiruchirappalli, 620015, Tiruchirappalli, Tamil Nadu, India

    Paulraj Sathiya

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Correspondence to M. Mohammed Asif.

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Umar, M., Mohammed Asif, M. & Sathiya, P. Creep and Corrosion Characteristics of Laser Welded AA5083 Al–Mg alloy. Lasers Manuf. Mater. Process. 9, 257–276 (2022). https://doi.org/10.1007/s40516-022-00175-5

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