Stirrer for glass manufacture

A stirrer for manufacturing glass, comprising a stirrer shaft and a plurality of rod-shaped stirrer blades penetrating through and fixed to the stirrer shaft, wherein

• each of the rod-shaped stirrer blade is a hollow cylindrical body comprising:
• a cylinder obtained by seam welding of two opposing sides of a flat plate made of (i) strengthened platinum containing platinum as a matrix and metallic oxide dispersed in the plate or (ii) a strengthened platinum alloy containing a platinum alloy as a matrix and metallic oxide dispersed in the plate;
• and
• a disk welded to an entire circumference of both ends of the cylinder and made from an identical material,
• wherein each of the rod-shaped stirrer blades penetrates through the stirrer shaft so that a weld line due to the seam welding crosses a center axis of the stirrer shaft, and is fixed so that the end portions of the respective blades follow a spiral around the stirrer shaft,
• the stirrer shaft having the rod-shaped stirrer blades welded at the root portion of each stirrer blade,
• each of the rod-shaped stirrer blades has a core layer within the walls of the cylinder having the matrix and metallic oxide dispersed structure, wherein the core layer has not been thermally affected by welding.