EFFECT OF WELDING SPEED ON MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF PULSED ND:YAG LASER WELDED DISSIMILAR METALS
Keywords:Pulsed Nd:YAG laser welding, dissimilar metals, microstructure, microhardness, tensil strength
This paper reports the effect of welding speed (350 mm/min-450 mm/min) on microstructural and mechanical characteristics of pulsed Nd:YAG laser welded Hastelloy C-276 and Monel 400 (0.5 mm thick) dissimilar sheets. The welding speed influences the heat input, overlapping factor and thereby, dictating the width, depth and nature of weld. While fine dendritic grains are seen at the weld zone, fine dendritic and columnar grains are observed at the weld interfaces. Maximum hardness and tensile strength are obtained at a welding speed of 400 mm/min owing to formation of finer grains as the tensile failure occurs in weaker parent metal (Monel 400). The average hardness, tensile strength and elongation of the dissimilar weld is 276 Hv, 664 MPa and 13.43 % respectively. Ductile fracture mode is observed in the Monel 400 laser welds.
Ma G Wu D Niu F and Zou H (2015), “Microstructure evolution and mechanical property of pulsed laser welded Ni-based super alloy”, Optics and Lasers in Engineering, Vol.72, 39-46.
Singh V B and Gupta A (2001), “The electrochemical corrosion and passivation behavior of Monel 400 in concentrated acids and their mixtures”, Journal of Materials Science, Vol.36, 1433-42.
Ramkumar K D Joshi V Pandit S Agrawal M Kumar O S Periwal S Manikandan M and Arivazhagan V (2014), “Investigations on the microstructure and mechanical properties of multi-pass pulsed current gas tungsten arc weldments of Monel 400 and Hastelloy C-276”, Materials and Design, Vol. 64, 77-82.
Sadek A A Abass M Zaghloul B Elrefaey A and Ushio M (2000), “Investigation of dissimilar joints between low carbon steel and Monel 400”, Transaction of Joining and Welding Research Institute, Vol.29(1), 21-8.
Ramkumar K D Naren S V Paga V R K Tiwari A and Arivazhagan N (2016), “Development of Pulsed current gas tungsten arc welding technique for dissimilar joints of marine grade alloys”, Journal of Manufacturing Processes, Vol.21, 20-13.
Sivagurumanikandan N Raghukandan K and Saravanan S (2016), “Nd:YAG laser butt welding of super duplex stainless steel”, Acted Manuscript in Lasers in Engineering.
Han Q Kim D W Kim D C Lee H and Kim N (2012), “Laser pulsed welding in thin sheets of Zircaloy-4, Journal of Materials Processing Technology, Vol.212, 1116-22.
ASTM International ASTM E8/E8M-11 (2012), Standard test methods for tension testing of metallic materials.
Neves M D M Lotto A Berretta J R Rossi W and Junior N D V (2009), “Microstructure development in Nd:YAG laser welding of AISI 304 and Inconel 600”, Welding International, Vol.24(10), 739-48.
Gao X L Liu J Zhang L J and Zhang J X (2014), “Effect of the overlapping factor on the microstructure and mechanical properties of pulsed Nd:YAG laser welded Ti6Al4V sheets”, Materials Characterization, Vol.93, 136-49.
Cao X and Jahazi M (2009), “Effect of welding speed on butt joint quality of Ti–6Al–4V alloy welded using a high-power Nd:YAG laser”, Optics and Lasers in Engineering, Vol.47, 1231-41.
Manikandan M Sasikumar P Murugan B A Sathishkumar M and Arivazhagan N (2015), “Microsegregation Studies on Pulsed Current Gas Tungsten Arc Welding of Alloy C-276”, International Journal of Scientific & Engineering Research, Vol.6 (12), 33-8.
Kazzaz H A Medraj M Cao X and Jahazi M (2008), “Nd:YAG laser welding of aerospace grade ZE41A magnesium alloy: Modeling and experimental investigations”, Materials Chemistry and Physics, Vol.109, 61-76.
Hosseini H S Shamanian M and Kermanpur A (2011), “Characterization of microstructures and mechanical properties of Inconel 617/310 stainless steel dissimilar welds”, Materials Characterization, Vol.62, 425-31.
Aravind D and Rose A R (2015), “Investigation on mechanical and metallurgical properties of TIG welded high temperature materials”, Journal of Manufacturing Engineering, Vol.10(2), 86-90.