Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Yuuichi Yosida

Kazuhiro Takahashi

Shinji Kodama

Shuji Yamamoto

Koki Tanaka

Hiroshi Kihira

Kiyonori Tokuno

Atsushi Seto

Takumi Nishimoto

Yoshinari Ishida

Takashi Domoto

Taku Kagawa

Masao Kimura

Masahiro Ogawa

Shoko Tsuchiya

A titanium or titanium alloy material for a separator of a polymer electrolyte fuel cell having high contact conductivity with carbon and high durability, and including an oxide film formed on a titanium or titanium alloy substrate by a stabilization treatment performed after a passivation treatment, and one or more kinds of conductive materials selected from carbide, nitride, carbonitride, and boride of tantalum, titanium, vanadium, zirconium, and chromium, the conductive materials being dispersed in the oxide film and having a major axis diameter of from 1 nm to 100 nm. A contact resistance value with a carbon paper is 20 m&#x3a9;&#xb7;cmor less at a surface pressure of 10 kgf/cmbefore and after an accelerated deterioration test in which the titanium or titanium alloy material is immersed in a sulfuric acid aqueous solution having an adjusted pH of 4 at 80&#xb0; C. for four days.

Titanium or titanium alloy material for fuel cell separator having high contact conductivity with carbon and high durability, fuel cell separator including the same, and manufacturing method therefor

Stiffening beads (A,B) are formed in turned portions in a region of a fillet bead () formed in a single stroke manner. At this time, it is set in such a manner that welding start positions of the stiffening beads (A,B) are in a region near the fillet bead and do not exist independently without mixing with other weld beads.

Method of forming fillet arc welded joint and fillet arc welded joint

A fuel tank for a vehicle is formed of a tank main body in which an upper tank and a lower tank are mutually joined to form a closed space in which fuel is housed, and a sub-tank fixed to a bottom surface part of the lower tank by spot welding, in which a plurality of rows of the spot welding are set along a longitudinal direction of the lower tank with an interval therebetween in a width direction of the sub-tank, at least one bead positioned between the rows of the spot welding and extending continuously along the longitudinal direction of the lower tank is formed on the bottom surface part of the lower tank, and a lower surface of the sub-tank has no portion that is not brought into contact with the bottom surface part of the lower tank except for the bead.

Fuel tank for vehicle

Growing community of inventors

Tokyo, Japan

Yuuichi Yosida