| 摘要 |
PROBLEM TO BE SOLVED: To perform welding with a satisfactory weld quality using a few welding materials and in a few weld times when welding by using a lower side solid tab 13, and to obtain a satisfactory and beautiful appearance when removing the lower side solid tab 13. SOLUTION: In the welding of a T-type joint arranged in a vertical position, after blocking the tip part of the groove of a work by the lower side solid tab 13 and after blocking a root side by a backing metal 12, by elevating the tip of the wire of a welding torch 7 while weaving it, the groove of the work is welded. The groove of the work is partitioned into a tip part area on the lower side solid tab 13 side and a main welding part area excepting the above tip part area, and a welding condition in which the welding characteristics of these respective areas are considered is set.
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