| 摘要 |
<p>PURPOSE:To obtain an accelerating tube having the smooth innersurface of each of conjoined portions and its high processing accuracy by conjoining componental parts, and then radiating a fusing beam to the inner surface of the conjoined portion so as to fuse an area near the inner surface of the conjoined portion. CONSTITUTION:An accelerating tube T is set in a beam radiating device 30, the upper and lower positions of the beam radiating device are respectively adjusted by a movable table 32, and then an optical fiber 36 is inserted into the accelerating tube T while the table 32 is being revolved. YAG laser beams are successively radiated along the inner surface of each of conjoined portions J so as to fuse an area near the inner surface of the conjoined portion J. At this time, the optical fiber 36 together with a gas pipe 37 for blowing argon gas upon the inner surface of the conjoined portion J is inserted into the accelerating tube T. Furthermore, an inner tube 38 is set on the accelerating tube T so as to reduce the volume of useless air entered into the accelerating tube T. Air present in the accelerating tube T at the time of radiating the laser beams is replaced by the argon gas, and the argon gas is blown upon the conjoined portion J whereto the laser beams are applied so that the conjoined portion may be prevented from its needles oxidation.</p> |
