| 摘要 |
PURPOSE:To perform an edge preparation operation in a wide permissible range of a root gap with high accuracy and to perform welding with high quality in a square groove by using a specific backing material and performing AC arc welding with a flux cored wire. CONSTITUTION:A backing material 3 of aluminum oxide-silicon oxide-magnesium oxide is disposed on the rear of a square groove fromed of both ends of a top plate 1 and a bottom plate 2. The root gap 4 of the square groove is set in a 4-9mm. range. The groove is arc welded with an AC power source by using a flux cored wire. If the AC power source is combined with the flux cored wire, an arc is widened, and the single layer single pass welding of the narrow square groove is made possible. |
