| 摘要 |
PURPOSE:To prevent scattering and sagging down of a molten metal during welding and to obtain satisfactory welding quality by pressing a stud for repair to the tip of a worn stud embedded by welding in a boiler tube, enclosing the contact part with an arc shield and welding both studs. CONSTITUTION:An arc shield 4 provided with an inside space 5 for receiving a stud 3 for repair having roughly the intermediate diameter between the max. diameter of a stud 2 embedded by welding in a boiler tube 1 and having the tip rounded by burning wear and the diameter in the tip part thereof and having the diameter corresponding roughly to the max. diameter of the worn stud 2 is used. The stud 3 is pressed to the tip of the stud 2 and the contact sections of both studs 2, 3 are enclosed by the shield 4 to prevent scattering and sagging down of the molten metal during welding. Both studs 2, 3 are directly welded in such a state by arc stud welding. There is therefore no need for cutting or machining the stud 2. |
