| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily perform the welding of a control rod drive housing by properly introducing shielding gas. <P>SOLUTION: A welding jig 1 for welding the control rod drive housing for welding a canopy seal 166 which is provided in circumferential form with the control rod drive housing formed in a cylindrical form along the circumference includes: a jig body 2 which is formed in an annular shape along the circumference of the canopy seal 166 and arranged by facing the inner peripheral surface to the groove portion of the canopy seal 166; a gas introduction portion 3 which has an introduction opening 3a on the outside of the annular shape of jig body 2, also has a discharge opening on the side of the inner peripheral surface of the jig body 2 and penetrates the interior of the jig body 2; a welding torch arranging portion 4 which is formed by notching a part of the jig body 2 and which drives through the outside of the annular shape and the inside of the jig body 2; and a guide portion 5 for holding the jig body 2 so that the inner peripheral surface of the jig body 2 is provided on the position opposed to the groove portion of the canopy seal 166 by being provided on the jig body 2 and being brought into contact with the control rod drive housing. <P>COPYRIGHT: (C)2012,JPO&INPIT |
