Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Takumi Tokiyoshi

Masaaki Fujita

Daigo Watanabe

Motoki Ebisu

Nobuhiko Nishimura

Keiichi Iwamoto

Takao Hashimoto

Toshihiko Imamoto

Fumitoshi Sakata

Masafumi Yamauchi

Shingo Shudo

Nobuyoshi Komai

Masaki Honda

Yuichi Kanemaki

Hiroyuki Ohyama

Shintaro Matsumoto

Yasuharu Chuman

Fumio Nishi

Toshiaki Nishio

Takuya Fukahori

Eiji Murakami

Akinori Yamaguchi

Koichi Teshima

Kimihiko Tominaga

Ichiro Ohtsu

Takeshi Miyazawa

Masahiko Hokano

Toshiyuki Imazato

A repair welding method according to at least one embodiment is for a member in which a first end and a second end of a parent material are connected by welding and includes: a step of removing a portion including at least a part of a first heat-affected zone of an existing welded portion of the member; and a step of performing repair welding after removing the portion. In a cross-section including the parent material and the existing welded portion, all intersection portions between the first heat-affected zone of the existing welded portion and a second heat-affected zone due to the repair welding have an intersection angle between the first heat-affected zone and the second heat-affected zone of 70° to 110°.

Repair welding method

Bolt holesare formed in a joint partof a turbine housing, with flanged boltsscrewed in the bolt holes. A flange partof a bearing housingis sandwiched between bearing surfacesof the flanged boltsand an inner end faceof the joint part. A sealing ringis interposed in an annular space s. Before the flanged boltsare fastened, there is formed a height difference G equivalent to a compression allowance h for the sealing ring, between an outer end faceof the joint partand a bolt receiving surfaceof the flange part. The flanged boltsare screwed into the bolt holesuntil the bearing surfacesmake tight contact with the outer end faceso as to resiliently deform the sealing ring

Sealing structure for turbocharger housing

A method of extending a life expectancy of a high-temperature piping, includes removing a heat insulation material which covers the piping having a high creep rupture risk, and lowering an outer surface temperature of piping, wherein a width of an exposed portion obtained is twice or more a distance from a peeled-off end portion of the exposed portion to a portion where a compressive stress is asymptotical to 0 after a change in stress between a tensile stress and the compressive stress occurring in the piping due to the removal of the heat insulation material is made from the tensile stress to the compressive stress, and the distance is calculated based on the following formulae, &#x3b2;x=5, here, &#x3bd; is a Poisson's ratio, a is an average radius of the piping, and h is a plate thickness of the piping.

Method of extending life expectancy of high-temperature piping and life expectancy extension structure of high-temperature piping

A damage evaluation method and apparatus of a metal material which is capable of determining whether a flaw in the metal sample is originated by the creep damage or in the manufacturing process, and also capable of estimating a remaining life of the metal component. The damage evaluation method of a metal material by the present invention is a method for evaluating a flaw in the metal sample comprising the steps of mounting onto a metal surface including an internal flaw and on both sides of the flaw a transmitting probe for transmitting an ultrasonic waves and a receiving probe for receiving the ultrasonic waves, transmitting the ultrasonic waves towards the internal flaw and receiving the diffracted wave from the flaw for determining whether or not a flaw is present in the metal, based on the analysis of the distribution of the diffracted waves and an analysis of the sample as to whether voids (creep voids) are present and, if present, the distribution of the voids.

Method and apparatus for evaluating damage of metal material

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Tokyo, Japan

Takumi Tokiyoshi