Microstructural analyses of aluminum–magnesium–silicon alloys welded by pulsed Nd: YAG laser welding

Hossain Ebrahimzadeh, Hassan Farhangi, Seyed Ali Asghar Akbari Mousavi, Arman Ghahramani

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Hossain Ebrahimzadeh, Hassan Farhangi, Seyed Ali Asghar Akbari Mousavi, and Arman Ghahramani, Microstructural analyses of aluminum–magnesium–silicon alloys welded by pulsed Nd: YAG laser welding, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp.660-668. https://dx.doi.org/10.1007/s12613-020-2027-y
Hossain Ebrahimzadeh, Hassan Farhangi, Seyed Ali Asghar Akbari Mousavi, and Arman Ghahramani, Microstructural analyses of aluminum–magnesium–silicon alloys welded by pulsed Nd: YAG laser welding, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp.660-668. https://dx.doi.org/10.1007/s12613-020-2027-y
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研究论文

脉冲Nd: YAG激光焊接铝镁硅合金的显微组织分析 

    通信作者:

    E-mail: h.ebrahimzadeh@ut.ac.ir

Research Article

Microstructural analyses of aluminum–magnesium–silicon alloys welded by pulsed Nd: YAG laser welding

Author Affilications
    Corresponding author:

    Hossain Ebrahimzadeh E-mail: h.ebrahimzadeh@ut.ac.ir

  • Funds: The authors would like to thank the metallography laboratory personnel of University of Tehran for their cooperation
  • Received: 25 October 2019; Revised: 19 January 2020; Accepted: 20 January 2020; Available online: 15 April 2020

Revealing grains and very fine dendrites in a solidified weld metal of aluminum–magnesium–silicon alloys is difficult and thus, there is no evidence to validate the micro- and meso-scale physical models for hot cracks. In this research, the effect of preheating on the microstructure and hot crack creation in the pulsed laser welding of AA 6061 was investigated by an optical microscope and field emission electron microscopy. Etching was carried out in the gas phase using fresh Keller’s reagent for 600 s. The results showed that the grain size of the weld metal was proportional to the grain size of the base metal and was independent of the preheating temperature. Hot cracks passed the grain boundaries of the weld and the base metal. Lower solidification rates in the preheated samples led to coarser arm spacing; therefore, a lower cooling rate. Despite the results predicted by the micro and meso-scale models, lower cooling rates resulted in increased hot cracks. The cracks could grow in the weld metal after solidification; therefore, hot cracks were larger than predicted by the hot crack prediction models.

 

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