| 摘要 |
PURPOSE:To make a back shielding gas unnecessary, and to cut down expenses by using a wire containing a flux whose main component is CaF2, constituting so that the atmosphere contact surface of a bead is covered with a slag in a melted state, and executing a penetration bead welding. CONSTITUTION:In a TIG welding method, a wire 1 filled with a flux 3 containing CaF2 as a main component, and a small quantity of Al, Ti, Nb, Cr, etc. is used for a hollow part of a cylindrical hoop 2. When this wire 1 is used and a penetration bead welding is executed by a TIG welding method, the flux 3 of the wire 1 is melted together with the hoop 2 by an arc, and in its melted state, the atmosphere contact surface of a penetration bead is covered with a slag 5, and oxidation of the penetration bead 4 is prevented. The slag 5 is stripped off from the penetration bead 4 by giving a shock by a suitable means after the penetration bead welding is ended. |
