Indian Welding Journal

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Study of Weld Geometry, Microstructure and Hardness of Fibre Laser Welded Dual Phase Steel


Affiliations
1 Department of Metallurgical and Materials Engineering, Mahatma Gandhi Institute of Technology, Gandipet, CBES P.O. Hyderabad- 500075, India
2 SEST, University of Hyderabad, India
3 DRDL, Hyderabad, India
4 Defence Metallurgical Research Laboratory, Hyderabad, India
     

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Laser weld beads were produced on Dual Phase 600 grade steel sheets of 1.6 mm thickness using Nd: YAG fibre lasers. Influence of welding speed and laser beam power on variations in the weld geometry and Microstructure, and its correlation with the mechanical properties was studied. Welding speed has a greater influence on the width of the weld zone and Heat Affected Zone, and depth of penetration than beam power. Rapid cooling rates associated with the weld zone resulted in the formation of martensite phase and a decrease in the volume fraction of martensite was observed with an increase in the distance from the weld zone. Microhardness of the weld zone increased to 360 - 380 HV from 180 - 200 HV.

Keywords

Dual Phase Steel, Fibre Laser Welding, Fusion Zone, Heat Affected Zone, Beam Power, Traverse Speed.
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  • Study of Weld Geometry, Microstructure and Hardness of Fibre Laser Welded Dual Phase Steel

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Authors

P. V. S. Lakshminarayana
Department of Metallurgical and Materials Engineering, Mahatma Gandhi Institute of Technology, Gandipet, CBES P.O. Hyderabad- 500075, India
Jai Prakash Gautam
SEST, University of Hyderabad, India
P. Mastanaiah
DRDL, Hyderabad, India
G. Madhusudan Reddy
Defence Metallurgical Research Laboratory, Hyderabad, India
K Bhanu Sankara Rao
Department of Metallurgical and Materials Engineering, Mahatma Gandhi Institute of Technology, Gandipet, CBES P.O. Hyderabad- 500075, India

Abstract


Laser weld beads were produced on Dual Phase 600 grade steel sheets of 1.6 mm thickness using Nd: YAG fibre lasers. Influence of welding speed and laser beam power on variations in the weld geometry and Microstructure, and its correlation with the mechanical properties was studied. Welding speed has a greater influence on the width of the weld zone and Heat Affected Zone, and depth of penetration than beam power. Rapid cooling rates associated with the weld zone resulted in the formation of martensite phase and a decrease in the volume fraction of martensite was observed with an increase in the distance from the weld zone. Microhardness of the weld zone increased to 360 - 380 HV from 180 - 200 HV.

Keywords


Dual Phase Steel, Fibre Laser Welding, Fusion Zone, Heat Affected Zone, Beam Power, Traverse Speed.

References





DOI: https://doi.org/10.22486/iwj%2F2019%2Fv52%2Fi4%2F186785