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A laser welding device for welding a long sized tubular grounding unit includes a work head arranged to rotate around an outer circumference of two tubular members to be welded, a laser oscillator, and apparatus to transmit the laser beam from the oscillator in sychronism with rotation of the work h

A laser welding device for welding a long sized tubular grounding unit includes a work head arranged to rotate around an outer circumference of two tubular members to be welded, a laser oscillator, and apparatus to transmit the laser beam from the oscillator in sychronism with rotation of the work head. In one embodiment the apparatus to transmit the laser beam includes an optical fiber.

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A laser welding device for constructing a long-sized tubular grounding container unit by connecting tubular barrels, comprising: a welding head disposed around respective facing ends of two tubular barrels arranged to be joined at the respective facing ends; a work head, including condensing means d

A laser welding device for constructing a long-sized tubular grounding container unit by connecting tubular barrels, comprising: a welding head disposed around respective facing ends of two tubular barrels arranged to be joined at the respective facing ends; a work head, including condensing means disposed in said welding head for condensing a laser beam onto the respective facing ends for welding the respective facing ends to form a joint, said work head being arranged to rotate around an outer circumference of the welded tubular barrels at the joint; a laser oscillator for generating a laser beam; and means for transmitting the laser beam from said laser oscillator to said condensing means in synchronism with the rotation of said work head; wherein said laser beam transmitting means includes an optical fiber wound around one of the tubular barrels to permit extension of the optical fiber during rotation of said work head.