Effect of heat input in pulsed Nd:YAG laser welding of titanium alloy (Ti6Al4V) on microstructure and mechanical properties

  • Pramod KumarEmail author
  • Amar Nath Sinha
Research Paper


In the present investigation, titanium alloy Ti6Al4V of 1.4 mm thickness has been laser-welded in butt joint configuration using pulsed Nd:YAG laser system. The effects of heat input on weld bead shape, fusion zone width (top, middle, and bottom), heat-affected zone (HAZ) width (top, middle, and bottom), and fusion zone area have been studied. The microstructure and mechanical properties of laser-welded specimens at various heat inputs (43.7–103.5 J/mm) have also been investigated. Microstructures of the fusion zone, HAZ, and parent material have been compared at various heat inputs using optical microscope and field emission scanning electron microscope (FESEM). The mechanical properties such as microhardness and tensile strength of the welded joints at varying heat inputs have been studied. Tensile tests of the welded specimen and base metal have been conducted for analyzing ultimate tensile strength and percentage elongation. Surface topography of the tensile fractured specimen of the welded joints and base metal has been examined to analyze the ductile and brittle behavior. EDS analyses of base metal and fusion zone of the welded specimen have been studied. XRD of the as-received base metal and welded specimen have been measured in the range of 30 to 85° to study the crystallographic structure.


Laser beam welding Ti6Al4V Microhardness Pulsed Nd:YAG laser Porosity Microstructure 


Funding information

The present research work was supported by Central Mechanical Engineering Research Institute (CMERI) Durgapur, India, and funded by the National Institute of Technology Patna, India. Many of the testing facilities have been carried out at IIT Kharagpur and IIT Kanpur.


  1. 1.
    Li Z, Gobbi SL, Norris I, Zolotovsky S, Richter KH (1997) Laser welding techniques for titanium alloy sheet. J Mater Process Technol 65:203–208CrossRefGoogle Scholar
  2. 2.
    Elias CN, Lima JHC, Valiev R, Meyers MA (2008) Biomedical applications of titanium and its alloys. JOM 60:46–49CrossRefGoogle Scholar
  3. 3.
    Balasubramanian TS, Balasubramanian V, Manickam MM (2011) Fatigue crack growth behaviour of gas tungsten arc, electron beam and laser beam welded Ti–6Al–4V alloy. Mater Des 32:4509–4520CrossRefGoogle Scholar
  4. 4.
    Chen YC, Nakata K (2009) Microstructural characterization and mechanical properties in friction stir welding of aluminum and titanium dissimilar alloys. Mater Des 30:469–474CrossRefGoogle Scholar
  5. 5.
    Yunlian Q, Ju D, Quan H, Liying Z (2000) Electron beam welding, laser beam welding and gas tungsten arc welding of titanium sheet. Mater Sci Eng A 280:177–181CrossRefGoogle Scholar
  6. 6.
    Lima MSFD (2005) Laser beam welding of titanium nitride coated titanium using pulse-shaping. Mater Res 8:323–328CrossRefGoogle Scholar
  7. 7.
    Bertrand C, Laplanche O, Rocca JP, Le Petitcorps Y, Nammour S (2007) Effect of the combination of different welding parameters on melting characteristics of grade 1 titanium with a pulsed Nd–Yag laser. Lasers Med Sci 22:237–244CrossRefGoogle Scholar
  8. 8.
    Costa A, Miranda R, Quintino L, Yapp D (2007) Analysis of beam material interaction in welding of titanium with fiber lasers. Mater Manuf Process 22:798–803CrossRefGoogle Scholar
  9. 9.
    Liu J, Watanabe I, Yoshida K, Atsuta M (2002) Joint strength of laser-welded titanium. Dent Mater 18:143–148CrossRefGoogle Scholar
  10. 10.
    Colegrove P, Simiand PE, Varughese A, Williams S, Yapp D (2009) Evaluation of a drilling model approach to represent laser spot microwelding. In Trends in welding research, ASM Proceedings of the 8th International Conference 2008, pp. 303–312Google Scholar
  11. 11.
    Torkamany MJ, Hamedi MJ, Malek F, Sabbaghzadeh J (2006) The effect of process parameters on keyhole welding with a 400 W Nd: YAG pulsed laser. J Phys D Appl Phys 39(21):4563–4567CrossRefGoogle Scholar
  12. 12.
    Chen Y, Chen S, Li L (2009) Effects of heat input on microstructure and mechanical property of Al/Ti joints by rectangular spot laser welding-brazing method. Int J Adv Manuf Technol 44(3–4):265–272CrossRefGoogle Scholar
  13. 13.
    Torkamany MJ, Ghaini FM, Papan E, Dadras S (2012) Process optimization in titanium welding with pulsed Nd: YAG laser. Sci Adv Mater 4:489–496CrossRefGoogle Scholar
  14. 14.
    Akman E, Demir A, Canel T, Sınmazçelik T (2009) Laser welding of Ti6Al4V titanium alloys. J Mater Process Technol 209:3705–3713CrossRefGoogle Scholar
  15. 15.
    Gao XL, Zhang LJ, Liu J, Zhang JX (2014) Effects of weld cross-section profiles and microstructure on properties of pulsed Nd: YAG laser welding of Ti6Al4V sheet. Int J Adv Manuf Technol 72:895–903CrossRefGoogle Scholar
  16. 16.
    Xu PQ (2012) Microstructure characterization of Ti–6Al–4V titanium laser weld and its deformation. Trans Nonferrous Metals Soc China 22:2118–2123CrossRefGoogle Scholar
  17. 17.
    Gao XL, Liu J, Zhang LJ, Zhang JX (2014) Effect of the overlapping factor on the microstructure and mechanical properties of pulsed Nd: YAG laser welded Ti6Al4V sheets. Mater Charact 93:136–149CrossRefGoogle Scholar
  18. 18.
    Gursel A (2017) Crack risk in Nd: YAG laser welding of Ti-6Al-4V alloy. Mater Lett 197:233–235CrossRefGoogle Scholar
  19. 19.
    Caiazzo F, Alfieri V, Astarita A, Squillace A, Barbieri G (2016) Investigation on laser welding of Ti-6Al-4V plates in corner joint. Adv in Mech Eng 9:1687814016685546Google Scholar
  20. 20.
    Kumar C, Das M, Paul CP, Singh B (2017) Experimental investigation and metallographic characterization of fiber laser beam welding of Ti-6Al-4V alloy using response surface method. Opt Lasers Eng 95:52–68CrossRefGoogle Scholar
  21. 21.
    Campanelli SL, Casalino G, Mortello M, Angelastro A, Ludovico AD (2015) Microstructural characteristics and mechanical properties of Ti6Al4V alloy fiber laser welds. Procedia CIRP 33:428–433CrossRefGoogle Scholar
  22. 22.
    Caiazzo F, Alfieri V, Corrado G, Cardaropoli F, Sergi V (2013) Investigation and optimization of laser welding of Ti-6Al-4 V titanium alloy plates. J Manuf Sci Eng 135:061012CrossRefGoogle Scholar
  23. 23.
    Akbari M, Saedodin S, Toghraie D, Shoja-Razavi R, Kowsari F (2014) Experimental and numerical investigation of temperature distribution and melt pool geometry during pulsed laser welding of Ti6Al4V alloy. Opt Laser Technol 59:52–59CrossRefGoogle Scholar
  24. 24.
    Oliveira JP, Miranda RM, Fernandes FB (2017) Welding and joining of NiTi shape memory alloys: a review. Prog Mater Sci 88:412–466CrossRefGoogle Scholar
  25. 25.
    Oliveira JP, Panton B, Zeng Z, Andrei CM, Zhou Y, Miranda RM, Fernandes FB (2016) Laser joining of NiTi to Ti6Al4V using a niobium interlayer. Acta Mater 105:9–15CrossRefGoogle Scholar
  26. 26.
    Auwal ST, Ramesh S, Yusof F, Manladan SM (2018) A review on laser beam welding of titanium alloys. Int J Adv Manuf Technol 97:1071–1098CrossRefGoogle Scholar
  27. 27.
    Sjögren G, Andersson M, Bergman M (1988) Laser welding of titanium in dentistry. Acta Odontol Scand 46:247–253CrossRefGoogle Scholar
  28. 28.
    Palanivel R, Dinaharan I, Laubscher RF (2017) Microstructure evolution and mechanical characterization of Nd: YAG laser beam welded titanium tubes. Mater Charact 134:225–235CrossRefGoogle Scholar
  29. 29.
    Gao XL, Liu J, Zhang LJ (2018) Effect of heat input on microstructure and mechanical properties of pulsed laser welded joints in Ti6Al4V/Nb dissimilar alloys. Int J Adv Manuf Technol 94:3937–3947CrossRefGoogle Scholar
  30. 30.
    Standard ASTM (2011) E3 Standard guide for preparation of metallographic specimens. West Conshohocken (PA): ASTM InternationalGoogle Scholar
  31. 31.
    ASTM E8/E8M (2013) Standard test methods for tension testing of metallic materials. West Conshohocken (PA): ASTM InternationalGoogle Scholar
  32. 32.
    Hong KM, Shin YC (2016) Analysis of microstructure and mechanical properties change in laser welding of Ti6Al4V with a multiphysics prediction model. J Mater Process Technol 237:420–429CrossRefGoogle Scholar
  33. 33.
    Squillace A, Prisco U, Ciliberto S, Astarita A (2012) Effect of welding parameters on morphology and mechanical properties of Ti–6Al–4V laser beam welded butt joints. J Mater Process Technol 212:427–436CrossRefGoogle Scholar
  34. 34.
    Elmer JW, Palmer TA, Babu SS, Zhang W, DebRoy T (2004) Phase transformation dynamics during welding of Ti–6Al–4V. J Appl Phys 95:8327–8339CrossRefGoogle Scholar
  35. 35.
    Huang JL, Warnken N, Gebelin JC, Strangwood M, Reed RC (2012) On the mechanism of porosity formation during welding of titanium alloys. Acta Mater 60:3215–3225CrossRefGoogle Scholar
  36. 36.
    EN BS (2011) 4678 Aerospace series. Weldments and brazements for aerospace structures. Joints of metallic materials by laser beam welding. Quality of weldments BSIGoogle Scholar

Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Institute of Technology PatnaPatnaIndia

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