National Research Institute for Metals

Hirosada Irie

Susumu Tsukamoto

Susumu Tukamoto

Kyoji Tachikawa

Hiroaki Kumakura

Kazumasa Togano

Tatsuya Hashimoto

Kazuo Hiraoka

Michio Inagaki

Yoshikazu Asai

Focusing laser beams are emitted to a gas plasma produced through discharge and a laser thermal plasma, which is independent of the gas plasma and extends coaxially along the laser beams, is produced in a gas flow space.

Laser thermal plasma method

A process for producing a superconducting compound tape or wire material, which comprises irradiating electron beams at an acceleration voltage of 5 to 150 KV on a starting tape or wire material consisting essentially of constituent elements of a superconducting compound, a compound between the constituent elements, and/or an alloy between the constituent elements at a power density, determined on the starting tape or wire material, of 1.times.10.sup.3 to 1.times.10.sup.7 W/cm.sup.2 while the starting tape or wire material is moved at a rate of 1 cm to 10 m/sec relative to the electron beams.

Process for producing superconducting compound tape or wire material by

For carrying out electron beam welding, there is formed by means of a magnetic or electric field set up by an even number of at least two magnetic poles or electrodes, an electron beam, the pattern of which has elliptical or similar shaped cross sections. Electron beam welding is performed using such an electron beam. The direction of the major axis of the cross section of the electron beam at the surface of the material being welded and the direction of the major axis of the cross section of the electron beam at the bottom of the beam cavity, i.e., the root portion, are at right angles to each other.

Electron beam welding method

A method and an apparatus for electron beam welding, in which the oscillation of the focus of an electron beam which is due to the pulsation of a direct-current high voltage for accelerating electrons is detected, and the electron beam is controlled according to the detected oscillation of the focus of the electron beam.

Growing community of inventors

Yokohama, Japan

Hirosada Irie