Skip to main content Accessibility help
×
Home

Studies on the weldability, microstructure and mechanical properties of flux assisted Nd:YAG laser welds of AISI 904L

  • K. Devendranath Ramkumar (a1), Gangineni Chaitanya (a1), Jelli Lakshmi Narasimha Varma (a1), Ayush Choudhary (a1), N. Arivazhagan (a1) and R. Oyyaravelu (a1)...

Abstract

This research article investigates the effect of SiO2 flux on Nd:YAG laser welding of 5 mm thick plates of super-austenitic stainless steel, AISI 904L. Microstructure studies revealed multidirectional grain growth comprising columnar and cellular dendrites along with a prominent, fine equiaxed dendritic growth at the centerline of the fusion zone. Tensile studies showcased the fracture at the fusion zone in all the trials. The average tensile strength reported for the flux assisted laser weldments was found to be 587 MPa which was slightly lower than the parent metal. The impoverishment of tensile strength could be attributed to the formation of centerline equiaxed grains. Similarly the impact toughness of the joints was found to be 58 J. The studies demonstrated the possibility of using a 2 kW Nd:YAG laser welding machine to weld 5 mm thick plate with the use of SiO2 flux. A detailed study on the structure–property relationship of flux assisted Nd:YAG laser weldment was carried out using the combined techniques optical microscopy, scanning electron microscopy, and energy dispersive x-ray analysis.

Copyright

Corresponding author

a) Address all correspondence to this author. e-mail: deva@vit.ac.in

References

Hide All
1. Kuo, M., Sun, Z., and Pan, D.: Laser welding with activating flux. Sci. Technol. Weld. Joining 6, 17 (2001).
2. Sun, H., Song, G., and Zhang, L.F.: Effect of oxide activating flux on laser welding of magnesium alloy. Sci. Technol. Weld. Joining 14(3), 305 (2008).
3. Ma, L., Hu, S., Hu, B., Shen, J., and Wang, Y.: Activating flux design for laser welding of ferritic stainless steel. Trans. Tianjin Univ. 20, 429 (2014).
4. Devendranath Ramkumar, K., Narasimha Varma, J.L., Chaitanya, G., Choudhary, A., Arivazhagan, N., and Narayanan, S.: Effect of autogeneous GTA welding with and without flux addition on the microstructure and mechanical properties of AISI904L joints. Mater. Sci. Eng., A 636, 1 (2015).
5. Zambon, A., Ferro, P., and Bonollo, F.: Microstructural, compositional and residual stress evaluation of CO2 laser welded superaustenitic AISI 904L stainless steel. Mater. Sci. Eng., A 424, 117 (2006).
6. Sathiya, P., Mishra, M.K., and Shanmugarajan, B.: Effect of shielding gases on microstructure and mechanical properties of super austenitic stainless steel by hybrid welding. Mater. Des. 33, 203 (2012).
7. Ahmadi, E. and Ebrahimi, A.R.: Welding of 316L austenitic stainless steel with activated tungsten inert gas process. J. Mater. Eng. Perform. 24, 1065 (2015).
8. Qin, G-l., Wang, G-g., and Zou, Z-d.: Effects of activating flux on CO2 laser welding process of 6013 Al alloy. Trans. Nonferrous Met. Soc. China 22, 23 (2012).
9. Matsunawa, A., Kim, J-D., Seto, N., Mizutani, M., and Katayama, S.: Dynamics of keyhole and molten pool in laser welding. J. Laser Appl. 10(6), 247254 (1998).
10. Kaplan, A., Mizutani, M., Katayama, S., and Matsunawa, A.: Unbounded keyhole collapse and bubble formation during pulsed laser interaction with liquid zinc. J. Phys. D: Appl. Phys. 35, 1218 (2002).
11. Norman, A.F., Drazhner, V., and Prangnell, P.B.: Effect of welding parameters on the solidification microstructure of autogenous TIG welds in an Al–Cu–Mg–Mn alloy. Mater. Sci. Eng., A 259, 53 (1999).
12. Kuo, T.Y.: Effect of pulsed and continuous Nd–YAG laser beam waves on the welding of Inconel alloy. Sci. Technol. Weld. Joining 10, 557 (2005).
13. Kou, S. and Wang, Y.H.: Welding pool convection and its effect. Weld. J. 65, 63-s (1986).
14. Mills, K.C. and Keene, B.J.: Factors affecting variable weld penetration. Int. Mater. Rev. 35, 185 (1990).
15. Glowacki, M.H.: The effects of the use of different shielding gas mixtures in laser welding of metals. J. Phys. D: Appl. Phys. 28, 2051 (1995).
16. Seto, N., Katayama, S., and Matsunawa, A.: High speed simultaneous observation of plasma and keyhole behaviour during high power CO2 laser welding: Effect of shielding gases on porosity formation. J. Laser Appl. 12, 245 (2000).
17. Lampman, S. ed.: Weld Integrity and Performance (ASM International, Materials Park, OH, 1997).
18. David, S.A. and Vitek, J.M.: Correlation between solidification parameters and weld microstructures. Int. Mater. Rev. 34(1), 213 (1989).
19. Lippold, J.C. and Kotecki, D.J.: Welding Metallurgy and Weldability of Stainless Steels (Wiley-Interscience, Hoboken, New Jersey, 2005).

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed