| 摘要 |
PURPOSE:To execute efficiently welding without executing a tack welding by executing the welding by changing a welding condition by interposed and non- interposed parts of a weldable spacer which has been interposed at an interval in a root gap of a body to be welded such as a pipeline, etc. CONSTITUTION:For instance, when bringing pipelines 1, 1 to butt welding, an edge preparation of a bevel angle theta1 and a root face width (d) is performed to the end part of both of them, and both the pipelines form a root gap 2 of width l by their root face 1a. In this state, plural pieces of spacers 3 consisting of a material of the same quality is that of the pipes 1, 1 and having a side face of a trapezoidal shape are inserted and attached at a suitable interval to the gap 2 along the longitudinal direction of the face 1a. Thereafter, welding is executed automatically by a welding robot along the butt part of the pipes 1, 1, but in the interposed and non-interposed parts of the spacer 3, welding sectional areas are different, therefore, as for the interposed part, a welding condition which has expected an increase portion of the welding sectional area is applied.
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