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Application of the Pulsed Nd: YAG Laser Welding to Investigate the Effect of Laser Beam Position on Weld Characteristics of AISI 420 Stainless Steel to Kovar Alloy

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Abstract

In the present study, dissimilar joining of AISI 420 Stainless Steel (SS 420) to Kovar alloy using a pulsed Nd:YAG laser welding was carried out. The effect of laser beam position with respect to the joint on the microstructure of dissimilar weldmetal was investigated through taking advantage of optical and scanning electron microscopy. Moreover, hardness measurement and fractography were performed to investigate the mechanical properties of weldmetal. A detailed effect of laser beam position on crack susceptibility of fusion zone is elaborated in this research work. The results showed promotion of susceptibility of fusion zone to cracking with offsetting laser beam position to SS 420 base metal. Also martensitic structure was formed in the weldmetal when off-set laser beam shifted 0.2 mm toward the SS 420 base metal. The microhardness test revealed that moving laser beam position toward SS 420 resulted in increasing weld hardness.

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Authors and Affiliations

  1. Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran

    S. H. Baghjari & M. Gholambargani

  2. School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Iran

    S. A. A. Akbari Mousavi

Authors
  1. S. H. Baghjari
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  2. M. Gholambargani
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  3. S. A. A. Akbari Mousavi
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Correspondence to S. H. Baghjari.

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Baghjari, S.H., Gholambargani, M. & Akbari Mousavi, S.A.A. Application of the Pulsed Nd: YAG Laser Welding to Investigate the Effect of Laser Beam Position on Weld Characteristics of AISI 420 Stainless Steel to Kovar Alloy. Lasers Manuf. Mater. Process. 6, 14–25 (2019). https://doi.org/10.1007/s40516-018-0078-y

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