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 strengthAbstract
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.
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