Indian Welding Journal

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

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
     

   Subscribe/Renew Journal


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.
User
Subscription Login to verify subscription
Notifications
Font Size

  • Keeler S and Kimchi M (2014); Advanced High Strength Steels– Application Guidelines, Version 5.0, World Auto Steels.

  • Bhattacharya D (2014); Microalloyed steels for the automotive industry technology, Metal. Mater. Miner., 11(4), pp.371-383.

  • Schemmann L, Zaefferer S, Raabe D, Friedel F and Mattissen D (2015); Alloying effects on microstructure formation of dual phase steels, Acta Materialia, 95, pp. 386–398.

  • Rashid MS (1981); Dual phase steels, Ann. Rev. Mater. Sci., 11, pp. 245-266.

  • Kim S and Lee S (2000); Effects of martensite morphology and volume fraction on quasi-static and dynamic deformation behavior of dual- phase steels, Metallurgical and Materials Transactions A, 31(A), p.1753.

  • Zhao YY, Zhangand YS and Hu W (2013); Effect of welding speed on microstructure, hardness and tensile properties in laser welding of advanced high strength steel, Science and Technology of Welding and Joining, 18(7), p. 581.

  • ASM Metals Handbook, Volume – 6 Welding, Brazing, and Soldering.

  • Becker F, Brettschneider C, Kallage P and Wolfram Rath (2014); Fibre lasers - a universal tool for industrial production, Laser Technik Journal.

  • Walsh CA (2002); Laser Welding- Literature Review, Materials Science and Metallurgy Department, University of Cambridge, England.

  • Zhengwei GU, Sibin YU, Lijun HAN, Xin LI and Hong XU (2012); Influence of welding speed on microstructures and properties of ultra-high strength steel sheets in laser welding, ISIJ International, 52(3), pp. 483–487.

  • Santillan A, Esquivel, Nayak SS, Xia MS and Zhou Y (2012); Microstructure, hardness and tensile properties of the fusion zone in laser welding of advanced high Strength steels, Canadian Metallurgical Quarterly, 51(3).

  • Takehide S (2001); Physical metallurgy of modern high strength steel sheets, ISIJ International, 41(6), pp. 520–532.

  • Palov S, Viliam H and Alexander S (2014); Study of laser welding of HTC600X dual phase steels, Scientific Proceedings, 22, pp. 92-97.

  • Pavol Š, Alexander S, Viliam H and Tomáš C (2015); Fibre laser welding of dual phase steels, Acta Metallurgica Slovaca, 21(4), pp. 311-320.

  • Hafez KM, Ramadan M, Fathy N and Ismail M (2017); Microstructure and mechanical properties of laser welded dual phase and mild steel jointsfor automotive applications, Applied Mechanics and Materials, 865, pp. 81-87.

  • Alves P, Lima MSF, Raabe D and Sandim HRZ (2017); Laser beam welding of dual-phase DP 1000 Steel, Journal of Material proceeding Tech., 252, pp. 498-510.


Abstract Views: 273

PDF Views: 7




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

Abstract Views: 273  |  PDF Views: 7

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