Denso Corporation

Hiroyasu Morikawa

Yuuichi Aoki

Arinori Shimizu

Hideaki Shirai

Yoshinori Ohmi

Hirokazu Hashimoto

Yoshihiko Matsusaka

In an ultrasonic joining method for joining a flange portion of a first member to a portion of a second member, a first horn and a second horn are arranged on the flange portion on a side opposite to the second member, and the first horn is vibrated in a condition that the second horn is biased against the first horn and the first horn and the second horn are pressed against the flange portion such that the flange portion is vibrated while being pressed against the portion of the second member. Because the first horn is vibrated in a condition that the first horn and the second horn are pressed against each other at press-contact portions thereof, vibration of the first horn is transferred to the second horn through the press-contact portions.

Ultrasonic flange joining method

An ultrasonic welding method and an ultrasonic welding device are provided to join a first member having a substantial pipe shape and a second member at a joining surface by pressure-applying and vibration-exciting. In an arranging process, each of a first horn member and a second horn member is slantways arranged in such a manner that a part of a pressure-applying surface thereof which is nearer to a division surface thereof becomes nearer to the joining surface, according to deformation in a joining process. Thus, in the joining process, the pressure-applying surfaces are disposed substantially parallel to the joining surface due to a pressure-applying reaction force, so that the first horn member and the second horn member can be pressed against each other at the division surfaces thereof.

Ultrasonic welding method, ultrasonic welding device and pipe joined by the same

A first member and a second member have end portions overlapped and welded by irradiating a laser beam on an outer surface of a lap portion. A front end surface of a fused portion slants at an obtuse angle larger than 90&deg; with respect to a naked outer surface of the second member. A dilution rate S&equals;B/(A&plus;B) is equal to or less than 45%, where &ldquo;A&rdquo; represents a cross-sectional area of the fused portion merging into the first member and &ldquo;B&rdquo; represents a cross-sectional area of the fused portion merging into the second member.

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Nagoya, Japan

Hiroyasu Morikawa