PURPOSE: A vertical fillet welding device for welding stiffeners is provided to improve welding quality because uniform welding beads are formed by maintaining a uniform weaving width regardless of the length of wires. CONSTITUTION: A vertical fillet welding device for welding stiffeners comprises a rail assembly(10) and a carriage(20). The rail assembly comprises a base plate(11), one or more guide rails(12), and attachment units(13). The base plate is positioned on the bottom of a work section to stably install the device. The guide rails are vertically installed on the base plate. The attachment units are connected to the guide rails and are attached to barrier walls and the stiffeners. The carriage comprises a control part body(21) and a linear weaving-type welding torch and vertically moves along the guide rails of the rail assembly. The linear weaving-type welding torch maintains a uniform weaving width in welding to form uniform welding beads.
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