| 摘要 |
PURPOSE:To suppress the absorption of a welding heat input caused by a backing strip, and to form stably an URANAMI (penetration) bead by interposing a spacer between a welding material and the backing strip, and executing URANAMI welding of the first layer. CONSTITUTION:A backing strip 5 on which a groove 4 has been worked along a weld line 1 is made to abut on welding materials 1, 2 by interposing a spacer 7 such as a stainless steel tape, a glass tape, etc. In this state, when URANAMI welding is executed, it does not contact directly because the spacer 7 is interposed between the welding materials 1, 2 and the strip 5, therefore, a thermal transfer from the welding material 1, 2 to the strip 5 is suppressed and an URANAMI bead is formed stably. As a result, the welding quantity is improved and also a welding condition for forming a correct URANAMI is expanded, therefore, welding can be performed easily.
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