Honda Motor Co., Ltd.

Hiroki Fujiuchi

Toshiyuki Horimukai

Naoki Takahashi

Tetsuya Kodama

Toshihiro Murakawa

Akira Goto

Sumitomo Watanabe

Takahiro Morita

Yota Eguchi

Hiroki Kuwahara

Keiji Otsuka

Shinya Ohyama

Toru Kumagai

The vehicle roof structure includes: a closely facing section that abuts or is adjacent to a side outer panel; a negative curved-surface section that is positioned more inwards in the vehicle width direction than the closely facing section of the roof panel, and has a recessed face that is indented downwards; and a mounting surface that is formed in the side outer panel at an inner side in the vehicle width direction to downwards of the vehicle towards, and at which the closely facing section abuts or is adjacent, in which an edge, on a side of the roof panel, of the brazing material that has solidified to join the roof panel and the side outer panel is positioned on the negative curved-surface section.

Vehicle roof structure and method for manufacturing vehicle roof structure

A magnetic field is generated in a workpiece in a direction orthogonal to the joining direction, and as a result of the Lorentz force resulting from the magnetic field and the current between the plasma torch and the workpiece, the front tip side of the arc is bent forward in the direction of advancement of the plasma torch and welding is performed. The magnetic field strength of the welded part is adjusted by changing the relative positions of the plasma torch and a butting portion of the workpiece.

Arc welding method, arc welding device and arc welding magnetic field strength adjustment method

A plasma torchused in plasma-arc welding is provided with a rod-shaped electrode, a first cylindrical nozzlewhich is provided to surround the electrodeand which injects a plasma gas and a second cylindrical nozzlewhich is provided to surround the first nozzleand which injects a shielding gas. A second injection openingof the second nozzledirects in a substantially parallel direction with respect to an axial direction of the electrodeor in a direction being away from the electrode, and a plurality of groove portions inclining with respect to the axial direction of the electrodeare formed in an outer circumferential surface of the first nozzleor an inner circumferential surface of the second nozzle

Plasma torch with swirl-inducing nozzle and method of using same

There is provided a nut having a thread portion having a female thread, a metallic plate portion having a base segment, and a hardness gradient portion provided between the thread portion and the metallic plate portion. The thread portion, metallic plate portion and the hardness gradient portion are monolithic each other, a metallographic structure of the metallic plate portion differs from a metallographic structure of the thread portion and a hardness of the hardness gradient portion is lower than a hardness of the thread portion and lowers from the thread portion toward the metallic plate portion.

Nut, female thread machining device and female thread machining method

A two-electrode arc welding device and two-electrode arc welding method are provided for performing welding with improved penetration performance using two non-consumable electrodes. In a two-electrode arc welding device, a power-supply unit outputs a straight-polarity voltage and a reverse-polarity voltage, which has a different electrical potential than the straight-polarity voltage. The straight-polarity voltage output from the power-supply unit is applied to a non-consumable electrode of a straight-polarity arc torch, whereby an arc is formed. The reverse-polarity voltage output from the power-supply unit is applied to a non-consumable electrode of a straight-polarity arc torch, whereby an arc is formed. An arc spacing distance, which is a distance between the ends of both the straight-polarity arc torch and the reverse-polarity arc torch, is set to be at least a minimum distance at which an arc will not occur therebetween (arc spacing critical distance).

Two-electrode arc welding device and two-electrode arc welding method

A thread forming deviceis provided with a thread forming toolfor forming a thread portionat a frame, a first motorfor controlling to rotate the thread forming tool, and a second motorfor controlling to extract and retract the thread forming tool. Further, the thread forming toolis provided with a pilot hole forming portionprovided with a spiral grooveat a front end portionin a taper shape, and a thread forming portionconstituted continuously to the pilot hole forming portionand provided with a spiral groove

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Tochigi, Japan

Hiroki Fujiuchi