Abstract: A turbine rotor includes a high- and low-temperature side rotor base materials. The high- and low-temperature materials include concavities and grooves. The turbine rotor has an enclosed space formed by the concavity of the high- and low-temperature materials being disposed opposingly, and a gap formed by the grooves of the high- and low-temperature materials being disposed opposingly. The turbine rotor contains a buildup welding section formed between the high- and low-temperature materials, which has the same composition as that of the high- or low-temperature material, and has a penetration bead on the enclosed space side, and the gap contains a weld metal filled therein. Thus, a stable penetration bead can be formed in a dissimilar material welded rotor combining two kinds of alloy materials with different thermal properties, and then generation of a non-welded portion of a butting section that becomes a start point of fracture can be suppressed.

Abstract: A turbine rotor includes a high- and low-temperature side rotor base materials. The high- and low-temperature materials include concavities and grooves. The turbine rotor has an enclosed space formed by the concavity of the high- and low-temperature materials being disposed opposingly, and a gap formed by the grooves of the high- and low-temperature materials being disposed opposingly. The turbine rotor contains a buildup welding section formed between the high- and low-temperature materials, which has the same composition as that of the high- or low-temperature material, and has a penetration bead on the enclosed space side, and the gap contains a weld metal filled therein. Thus, a stable penetration bead can be formed in a dissimilar material welded rotor combining two kinds of alloy materials with different thermal properties, and then generation of a non-welded portion of a butting section that becomes a start point of fracture can be suppressed.

Abstract: According to the present invention of the simple structure in which the back pressure chamber of the inner vent type regulator is divided by the inner vent diaphragm and the displacement limitation rod protrudes from the center portion thereof to the center portion of the pressure regulation diaphragm, it is possible to suppress the variation in air-fuel ratio to a minimum both when the air cleaner is blocked and at the time of high load operation, without being accompanied by a rise in costs.

Abstract: An apparatus for welding of a member to be welded in a vacuum chamber accommodating a part of the member, comprises a housing for defining the vacuum chamber, the housing including upper and lower housings between which the member to be welded is held, the upper and lower housings each having front and rear sides; an electron gun mounted on the upper housing; a drive device for moving the electron gun in a welding direction; an adjustment member or adjustment liner plate disposed on the lower housing for defining spaces allowing a part of the member to be welded to fit in at the front and rear sides of the lower housing so that the entirety of a welding portion of the member is in the vacuum chamber and both sides of the welding line are exposed in vacuum; sealing material for sealing between the housing, the adjustment member or adjustment liner plate and the member to be welded.