Investigating the effect of process parameters on weld pool thermal history and mechanical properties of laser welded Inconel 625 and Duplex stainless steel 2205 dissimilar welds

Ahmad, Gulshad Nawaz and Raza, Mohammad Shahid and Singh, N.K. and Muvvala, Gopinath (2021) Investigating the effect of process parameters on weld pool thermal history and mechanical properties of laser welded Inconel 625 and Duplex stainless steel 2205 dissimilar welds. Optik, 248. pp. 1-11. ISSN 0030-4026

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Abstract

In present study, welding of Inconel 625 and 2205 grade duplex stainless steel (DSS 2205) was carried out using a 2 kW Yb-fiber laser. An infrared (IR) pyrometer was used to log the thermal history of the weld pool. The molten weld-pool lifetime and cooling rates were accessed through the recorded data, and their effect on microstructure, elemental segregation, hardness and tensile properties of welded joints was investigated. The weld bead was composed of columnar and equiaxed dendritic grains. The microstructure exhibited refinement with increase in cooling rate, reducing the micro-segregation of Molybdenum (Mo) and Niobium (Nb) in the inter-dendritic spacing which was further investigated through XRD analysis. Also, tensile strength was found to be maximum i.e., 896.4 ± 8.1 MPa in the samples welded at 1950 W, 5500 mm/min which exhibited the fastest cooling within the range of parameters selected. © 2021 Elsevier GmbH

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IITH Creators:

IITH Creators	ORCiD
Muvvala, Gopinath	https://orcid.org/0000-0002-2133-3686

Item Type:

Article

Additional Information:

Prof. A K Nath and other academic members, research scholars, and technical staff of the Laser processing laboratory, Dept. of Mechanical Engineering, I.I.T. Kharagpur, are gratefully acknowledged for advising and supporting the authors in the completion of the present work.

Uncontrolled Keywords:

cooling rate; laser welding; microstructure; molten weld-pool thermal history; tensile strength

Subjects:

Physics > Mechanical and aerospace

Divisions:

Department of Mechanical & Aerospace Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

01 Sep 2022 06:19

Last Modified:

01 Sep 2022 06:19