| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve the butt welding of a double pipe by laser beam welding irrespective of the length of the pipe without disposing a rolling mechanism outside the pipe. <P>SOLUTION: A laser beam welding device includes: a laser welding head 12 including an optical system that causes a laser beam brought by an optical fiber 34 to be reflected by a reflective mirror 33 to irradiate the inner periphery of the pipe of an object to be welded with the reflected light; the rolling mechanism 14 for supporting the laser welding head 12 in a position where the axis line of the laser welding head 12 is eccentrically positioned relative to the tube axis of the pipe, and swirling the laser welding head 12 around the rotation axis located on the tube axis; and a fixation mechanism 16 for pressing a plurality of fixing pads 21 stored in a barrel 20 coupled coaxially with the rolling mechanism 14 to the inner periphery of the pipe, fixing the barrel 20 coaxially with the tube axis and also fixing the position of the laser welding head 12 in the tube axial direction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
