Nkk Corporation

Nippon Sanso Corporation

Yoshihiro Kanjo

Yuji Sugitani

Yasuhiko Nishi

Masatoshi Murayama

Daisuke Ozamoto

Takanori Nishimura

Naoyuki Gotoh

Hitoshi Serizawa

Method of detecting root gap and arc welding method using the former

An apparatus for detecting a shape of a groove, comprises: a device for forming picture images of a groove and a groove face of a work piece of metal to be welded with the use of a welding arc as illuminating light; a storage device for storing information on picture elements of the picture images formed by the device for forming picture images; an integrating device for integrating the information of the picture elements stored in the storage device in a predetermined direction of a memory in the storage device; a differentiating device for differentiating the integrated information in the direction rectangular to the predetermined direction of the memory; and a detecting device for detecting information of shapes of the groove and the groove face on the basis of the differentiated information on the picture elements. The apparatus for detecting a shape of a groove is provided with a processing device which processes command values of welding current and of a welding speed on the basis of information on shapes of the groove and the groove face. The device for forming an image is provided with an air nozzle open toward an image forming area.

Apparatus for detecting a shape of a groove

An apparatus for automatically welding a cylindrical vessel, which comprises: a rotating means (8) for rotating a cylindrical vessel to be welded around the center axis thereof; a travelling carriage (1); a manipulator (2) mounted on the carriage (1), said manipulator comprising a vertical post (10) secured onto the carriage (1), a horizontal column (11) movable horizontally and vertically along the vertical post (10), and an expansion arm (12) fitted rotatably to the leading end of the horizontal column (11); a welding head (4) fitted through an L-shaped fitting member (3) to the tip of the arm (12), said welding head comprising a welding nozzle (16), a groove profiling means (17) and a groove shooting means (20); a welding wire feeder (5) mounted on the carriage (1); a welding electric power source (6) mounted on the carriage (1); and a welding controller (9) mounted on the carriage (1), said welding controller comprising an image processor (32), a welding current controller (33), a welding wire feed controller (34), a welding speed controller (35), and a groove profiling controller (36).

Apparatus for automatically welding cylindrical vessel

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Tsu, Japan

Yoshihiro Kanjo