Improving resistance welding of aluminum sheets by addition of metal powder

Ihsan K. Al Naimi, Moneer H. Al-Saadi, Kasim M. Daws, Niels Oluf Bay

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In order to ensure good quality joints between aluminum sheets by resistance spot welding, a new approach involving the addition of metal powder to the faying surfaces before resistance heating is proposed. Three different metal powders (pure aluminum and two powders corresponding to the alloys AA2024 and AA7075) are investigated for the resistance spot welding of AA1050 aluminum sheets of three different thicknesses. Microstructural and mechanical analysis demonstrates that significant improvement in weld bead morphology and strength are obtained with the addition of metal powder. The improvement obtained is shown to be due to the development of a secondary bond in the joint beside the weld nugget increasing the total weld area. The application of powder additive is especially feasible, when using welding machines with insufficient current capacity for producing the required nugget size. In such cases the best results are obtained with pure aluminum powder.
Original languageEnglish
JournalProceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Volume229
Issue number6
Pages (from-to)493-502
ISSN1464-4207
DOIs
Publication statusPublished - 2015

Keywords

  • Resistance spot welding
  • Metal powder
  • Secondary bond
  • Welding parameters
  • Weld nugget

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