| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of an edge joint capable of preventing generation of spatter, improving workability and forming a stabilized good bead when welding edges of two or more metal members. SOLUTION: When forming a edge joint by welding a part Y to be welded consisting of an edge 18 of one end of a discharge tube 11 and an edge 14 of a partition plate 12, the part Y to be welded is welded at the state that a plasma arc is rotated so that the axis in the longitudinal direction of the plasma arc depicts a conical face. In this case, a length of the plasma arc is set to <=9 mm and a rotation width of the plasma arc to <=10 mm. The clearance between the discharge tube 11 and the partition plate 12 is set to <=2.5 mm. When using a wire 23 in welding, a position deviation of one end of the wire 23 for the width direction of the part Y to be welded is set to <=1 mm from the middle in the width direction of the part Y to be welded.
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