Nippon Steel Corporation

Hirohisa Fujiyama

Kazuo Nagatomo

Kenichi Karimine

Koichi Shinada

Tsuyoshi Takino

Akira Kimura

Makoto Okumura

Hiroshi Kashiwabara

Takao Ishii

Nobuyuki Aoki

Yoshio Kanbe

Method of automatically welding rails

A process for automatic fusion welding of rails by a combination of submerged arc welding and electroslag welding, comprising a root run for welding a rail base by submerged arc welding and, without interruption of the welding, subsequent runs for welding the rail base and welding a region from a rail web to a rail head by electroslag welding; wherein, during all of the runs, a metal mold is mounted on an upper surface of the rail base and a metal shoe is mounted on the metal mold to prevent an outflow of molten slag and molten metal and, during all of the runs, welding is performed by using a DC welding transformer having constant potential characterisitcs, a filler-wire having a diameter of from 1.2 to 2.0 mm, and a fused-type flux. The inventive process avoids the use of different fluxes and an alteration of welding machine conditions during the whole sequence of welding from the rail base through to the rail head.

Process for automatic fusion welding of rails

In welding iron, steel, and nonferrous alloys, the wire feed is changed periodically and in synchronism with periodic changes of the electric welding current to establish a previously defined relation between the welding current value and the arc length. The welding current is varied between one producing a spray transfer arc and a current just maintaining the arc.

Method for welding iron steel and nonferrous alloy

Growing community of inventors

Sagamihara, Japan

Hirohisa Fujiyama