The influence of pulsed laser beam welding (LBW) parameters on theweld geometry and imperfections of a new nickel-based superalloy called G27 wasstudied by a statistical design of experiment, and the microstructures of the weldfusion zone (FZ) of the pulsed laser beam-welded G27 were characterized. Noevidence of cracks is found in the FZ and heat-affected zone (HAZ). Other weldimperfections, such as undercut and underfill, were also hardly observed. The pulsefactor significantly influenced all the responses, i.e., minimum weld width (Wm),root excess weld metal, and average pore diameter, whereas welding travel speedsignificantly influenced Wm and root excess weld metal. Power and interactionbetween pulse frequency*pulse factor were statistically significant in influencingthe root excess weld metal and average pore diameter, respectively. The pulsefrequency and interactions between power*travel speed, power*pulse factor,power*pulse frequency, travel speed*pulse factor, and travel speed*pulse frequencydid not significantly influence any response. Microsegregation pattern that occursduring weld solidification leads to the formation of Nb-rich MC carbides and Nbrich Laves phase as the major secondary phase constituents in the FZ of as-weldedG27. The presence of brittle Laves phase requires careful consideration whendeveloping suitable post-weld heat treatment of G27.