Japanese National Railways

Hakusan Seisakusho Co., Ltd.

Kyushu Tetsudo Kiki Seizo Co., Ltd.

Kyushu Tetsudo Kiki Mfg., Co., Ltd.

Takeo Aichi

Hirotsugu Oishibashi

Shigeru Sasaki

Muneyuki Ohara

Mitsuo Nakamura

Katsuyoshi Ueyama

Hideo Endo

Mitsuji Hayashi

A method of field welding head-hardened rails which includes the steps of gas pressure welding the rails, shearing off excess metal therefrom at the welded portion with a portable welder device, subjecting the railhead of the pressure welded portion of the rails to a subsequent heat treatment with a gas heater device, setting a width of the pressure welded portion to be heated at the time of the subsequent heat treatment with a pair of jigs, and cooling the portion which has undergone the subsequent heat treatment with an air blowing type cooler.

Method of field welding head-hardened rails

A build-up spraying apparatus is disclosed which is capable of positionally adjusting the spreading rate of build-up metal powder on an article along the spreading direction to satisfactorily carry out partial or local build-up as well as uniform build-up as desired. The build-up spraying apparatus includes a fluid control device for spreading build-up metal powder having a pair of control gas injection nozzles formed at the both sides of the interior thereof and a control gas switching cycle setting means for supplying two systems of control gas to the fluid control device at a predetermined cycle to positionally control the spreading rate of build-up metal powder in the spreading direction. The apparatus also includes at least one heating burner body for heating build-up metal powder ejected from the fluid control device, the heating burner body being adapted to vary the amount of heat according to the difference in injection rate of build-up metal powder in the spreading direction.

Build-up spraying apparatus

Growing community of inventors

Kitakyushu, Japan

Takeo Aichi