| 摘要 |
PURPOSE:To form a good welding bead on both surface and reverse side, by using a copper material, and a composite core wire containing a flux, for a backing material and a welding core wire, respectively, and executing single side welding at a specified torch angle. CONSTITUTION:Welding is executed by using a copper plate or a copper alloy as a backing material 7, butting an object to be welded 1 on a groove 8 of the backing material 7, generating a welding arc 5 between a welding core wire 6 containing a flux and the object to be welded 1, and setting a torch angle to 2 deg.-10 deg. angular advance. In this case, the flux of the welding core wire 6 is melted earlier than a metal of the welding core wire 6, and a back slag 9 is formed in the groove 8. A molten metal flows into the groove 8 after the back slag is formed, and a back bead 3 is formed. Therefore, the back bead 3 becomes very smooth since the molten metal is not quenched by the copper plate 7. Also, a part of the flux forms a coating surface slag 10 on a surface bead 4, and a good surface bead 4 is obtained. |
