ASSEMBLING METHOD OF STATOR BLADE RING SEGMENT, STATOR BLADE RING SEGMENT, COUPLING MEMBER, WELDING METHOD

摘要

The present invention has an object to provide an assembling method of a stator blade ring segment that can prevent the risk of thermal deformation and a reduction in strength, ensure flexibility of shape, and increase compression performance of a compressor. The present invention has another object to provide welding that prevents an object to be welded from rising from a groove or a recess during welding and allows satisfactory welding. A groove 50 formed in each segment piece 41 is formed to have side wall portions 50b on opposite sides inclined with respect to a bottom 50a so that a width of the groove 50 gradually decreases from an outer peripheral side toward the bottom 50a, and a coupling member 42 has a sectional shape so as to have a maximum width at protrusions 42b at an intermediate portion in a thickness direction. The protrusions 42b on the opposite sides abut against or approach the side wall portions 50b of the groove 50 when the coupling member 42 is placed in the groove 50, a space 100 is formed on the side of the bottom 50a of the groove 50, and a welding groove 200 having a substantially V-shaped section is formed on the side remote from the bottom 50a of the groove 50.