Ihi Corporation

Koji Nezaki

Satoshi Yamanaka

Hiroshi Saito

Kosuke Watanabe

Yuuichi Miura

Kunitaka Masaki

Kenkichi Murata

Tadafumi Kanayama

Yasushi Tabei

Syoichiro Kaihara

Provided is a method of welding a shaft and a wheel in a turbine shaft. A target surface with a hole is provided to any one of the shaft and the wheel. An opposed surface is provided to the other one of the shaft and the wheel. The opposed surface includes an opposed portion opposed to the target surface, and a non-opposed portion formed continuously from the opposed portion toward a center side while facing onto the hole. The welding method includes: disposing the target surface and the opposed surface such that the they are opposed to each other while establishing a state of surface contact; and welding them by beam irradiation from outside in a radial direction of the shaft toward inside in the radial direction thereof based on a condition to cause a depth of fusion to reach a position on a center side beyond the opposed portion.

Method of welding shaft and wheel in turbine shaft, turbine shaft, and welding device

In the present disclosure, friction stir welding tools having probes and stationary shoulders are disposed at corners between a first workpiece and a second workpiece. A welding device main body includes axially perpendicular movement units for moving spindle units, which hold the respective friction stir welding tools on a frame, in directions perpendicular to rotary shafts of probes, and axial movement units for moving the spindle units in directions parallel to the rotary shafts of the probes.

Friction stir welding device

Growing community of inventors

Tokyo, Japan

Koji Nezaki