| 摘要 |
PURPOSE:To increase the finding precision, and to improve the dependability of the welded joints by enabling the radiograph examination of the internal surface and the inside of an internal cylinder. CONSTITUTION:Detecting grooves 8a and 8b are provided on both sides of each welded joint 7a, 7b, etc. of an internal cylinder 2. Detecting holes 6a, 6b, and 6c are perforated by a drill from the external cylinder 5 side after a multilayer part 4 is formed, and fixed by welds 9a, 9b, 9c, etc. to internal protective cylinders 3a, 3b, 3c, etc. Then the drill hole is closed with filler metals 10a, 10b, and 10c. The detecting holes 6a, 6b, 6c, etc. are fixed by welds 11a, 11b, 11c, etc., and airtightness is maintained. |
