Method for manufacturing a shrouded impeller

A method for manufacturing a shrouded impeller, the method comprising:

• providing a disk and a shroud, the disk comprising an outer surface with grooves disposed therein, the grooves having side surfaces and a bottom, and the shroud comprising blades having a base and a tip;
• placing the disk and the shroud coaxial to one another so that the blades align with and contact the shroud proximate the grooves;
• using a wobbling laser beam with a wobbling movement, welding each of the blades to the shroud along the grooves, by:
• first, passing the wobbling laser beam along each groove a number of passes to melt the bottom of the grooves and form a weld that is as wide as the grooves, wherein the wobbling movement is configured to limit the number of passes to less than a ratio between width of the grooves and diameter of the wobbling laser beam;
• and
• second, after subsequent solidification of molten material at the bottom welds the disk and the shroud along each of the grooves, generating superimposed layers of metal material to fill each of the grooves, wherein each layer of metal material is molten with the wobbling laser beam and subsequently solidifies inside of the grooves.