Advertisement

A Study on Welding of Thin Sheet of Ti6-Al-4V Alloy Using Fiber Laser and Its Characterization

  • Manowar Hussain
  • Gulshad Nawaz Ahmad
  • Pankaj KumarEmail author
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

In the present research work, an attempt has been made to study and investigate the weldability of 1.2-mm-thick Ti6-Al-4V alloy sheet using CW (continuous wave) fiber laser. The influences of the variable process parameters such as laser power, weld scanning speed and laser beam diameter on the microstructure, heat-affected zone (HAZ) and mechanical properties of the final butt-welded joints of Ti6-Al-4V sheets have been investigated. All the experiments were performed by using a CW fiber laser having a laser power capacity of 400 W. At different parameter setting conditions such as laser power varying from 200 to 350 W, weld scanning speed from 120 to 200 mm/min and laser beam diameter (0.4 mm) were considered for the experimentation. Based on the experiments weld quality was investigated and characterized in terms of the surface microstructure, micro-hardness, and tensile strength of the welded samples. Morphological studies at different processing conditions were carried out to study their effects on the HAZ (Heat-affected zone) and weld bead geometry. Microscopic images of welded samples clearly show a decrease in weld width of the welded sample with an increase in weld scanning speed and with increasing laser power increase in width was observed. At a scanning speed of 120 mm/min with varying power from 200 to 350 W the size of heat-affected zone (HAZ) are 3.55, 3.70, 3.84, 4.8 mm, and the corresponding size of fusion zones is 1.751 mm, 1.83 mm, 1.921 mm, 2.032 mm, respectively. The trend in micro-hardness variation was observed and it depends on grain size in laser welding. At 350 W laser power with varying speed from 120 to 300 mm/min, the micro-hardness values of the welded sample were found as 387.1, 395, and 403 HV. The tensile strength of the original sample was found to be 940 N/mm2. The testing results of the welded sample have a maximum failure strength of 507 N/mm2 at 350 W and 200 mm/min scanning speed. FESEM images of the welded sample at different processing conditions were used for the study of microstructural changes in the welded zone and the presence of defects at the micro level.

Keywords

Fiber laser Ti6Al4V Microstructure Vickers hardness FESEM 

References

  1. 1.
    Boyer RR (1996) An overview on the use of titanium in the aerospace industry. Mater Sci Eng, A 213(1–2):103–114CrossRefGoogle Scholar
  2. 2.
    Mazumder J, Steen WM (1982) Microstructure and mechanical properties of laser welded titanium 6Al-4V. Metall Trans A 13(5):865–871CrossRefGoogle Scholar
  3. 3.
    Kumar V, Hussain M, Raza MS, Das AK, Singh NK (2017) Fiber laser welding of thin nickel sheets in air and water medium. Arab J Sci Eng 42(5):1765–1773CrossRefGoogle Scholar
  4. 4.
    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(2):427–436CrossRefGoogle Scholar
  5. 5.
    Mirshekari GR, Saatchi A, Kermanpur A, Sadrnezhaad SK (2013) Laser welding of NiTi shape memory alloy: comparison of the similar and dissimilar joints to AISI 304 stainless steel. Opt Laser Technol 54:151–158CrossRefGoogle Scholar
  6. 6.
    Quintino L, Costa A, Miranda R, Yapp D, Kumar V, Kong CJ (2007) Welding with high power fiber lasers–a preliminary study. Mater Des 28(4):1231–1237CrossRefGoogle Scholar
  7. 7.
    Sathiya P, Panneerselvam K, Soundararajan R (2012) Optimal design for laser beam butt welding process parameter using artificial neural networks and genetic algorithm for super austenitic stainless steel. Opt Laser Technol 44(6):1905–1914CrossRefGoogle Scholar
  8. 8.
    Dawes C. (1992) Laser welding. McGraw-Hill, New York, USA, 73 ppCrossRefGoogle Scholar
  9. 9.
    Fricke W (2003) Fatigue analysis of welded joints: state of development. Mar Struct 16(3):185–200CrossRefGoogle Scholar
  10. 10.
    Elmer JW, Palmer TA, Babu SS, Zhang W, DebRoy T (2004) Phase transformation dynamics during welding of Ti–6Al–4V. J Appl Phys 95(12):8327–8339CrossRefGoogle Scholar
  11. 11.
    Kabir ASH, Cao X, Medraj M, Wanjara P, Cuddy J, Birur A (2010) Effect of welding speed and defocusing distance on the quality of laser welded Ti–6Al–4V. In: Proceedings of the Materials Science and Technology (MS&T) 2010 Conference. Houston, TX, pp 2787–2797Google Scholar
  12. 12.
    Chen HC, Pinkerton AJ, Li L (2011) Fibre laser welding of dissimilar alloys of Ti-6Al-4V and Inconel 718 for aerospace applications. Int J Adv Manuf Technol 52(9–12):977–987CrossRefGoogle Scholar
  13. 13.
    Zhang LJ, Zhang JX, Gumenyuk A, Rethmeier M, Na SJ (2014) Numerical simulation of full penetration laser welding of thick steel plate with high power high brightness laser. J Mater Process Technol 214(8):1710–1720CrossRefGoogle Scholar
  14. 14.
    Cao X, Jahazi M (2009) Effect of welding speed on butt joint quality of Ti–6Al–4V alloy welded using a high-power Nd: YAG laser. Opt Lasers Eng 47(11):1231–1241CrossRefGoogle Scholar
  15. 15.
    Liu J, Gao XL, Zhang LJ, Zhang JX (2014) A study of fatigue damage evolution on pulsed Nd: YAG Ti6Al4V laser welded joints. Eng Fract Mech 117:84–93CrossRefGoogle Scholar
  16. 16.
    Dhanasekaran R, Sathish Kumar K (2015) Microstructure, mechanical properties of A356/Li aluminum alloy fabrication by stir casting method. Int J Appl Eng Res 10(50):416–419Google Scholar
  17. 17.
    Hussain M, Mandal V, Kumar V, Das AK, Ghosh SK (2017) Development of TiN particulates reinforced SS316 based metal matrix composite by direct metal laser sintering technique and its characterization. Opt Laser Technol 97:46–59CrossRefGoogle Scholar
  18. 18.
    Hussain M, Mandal V, Singh PK, Kumar P, Kumar V, Das AK (2017) Experimental study of microstructure, mechanical and tribological properties of cBN particulates SS316 alloy based MMCs fabricated by DMLS technique. J Mech Sci Technol 31(6):2729–2737CrossRefGoogle Scholar
  19. 19.
    Gao XL, Zhang LJ, Liu J, Zhang JX (2014) Porosity and microstructure in pulsed Nd: YAG laser welded Ti6Al4V sheet. J Mater Process Technol 214(7):1316–1325CrossRefGoogle Scholar
  20. 20.
    Hussain M, Kumar V, Mandal V, Singh PK, Kumar P, Das AK (2017) Development of cBN reinforced Ti6Al4V MMCs through laser sintering and process optimization. Mater Manuf Processes 32(14):1667–1677CrossRefGoogle Scholar
  21. 21.
    Mandal V, Hussain M, Kumar V, Das AK and Singh NK (2017) Development of reinforced TiN-SS316 metal matrix composite (MMC) using direct Metal laser sintering (DMLS) and its characterization. Materials Today: Proceedings 4(9):9982–9986Google Scholar
  22. 22.
    Gupta A, Hussain M, Misra S, Das AK and Mandal A (2018) Processing and characterization of laser sintered hybrid B4C/cBN reinforced Ti-based metal matrix composite. Opt Lasers Eng 105:159–172CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Manowar Hussain
    • 1
  • Gulshad Nawaz Ahmad
    • 2
  • Pankaj Kumar
    • 3
    Email author
  1. 1.Department of Mechanical EngineeringChaitanya Bharathi Institute of TechnologyHyderabadIndia
  2. 2.Department of Mechanical EngineeringIndian Institute of Technology (ISM) DhanbadDhanbadIndia
  3. 3.Department of Mechanical EngineeringS R Engineering CollegeWarangalIndia

Personalised recommendations