| 摘要 |
PURPOSE: To obtain a welding structure being free from a welding defect such as incomplete fusion or a weld crack and enabling easy execution of welding. CONSTITUTION: A tube 3 of an Ni-group alloy is welded beforehand to one side of an austenitic steel tube 2 and inserted into a groove formed by machining in a ferritic steel tube plate 1 and welding is made with a ferrite-series welding material 5 having the same constituents as the tube plate l to the height of the tube 3 of Inconel and then with a welding material 6 of Inconel series thereafter. |
