Positioning device for U rib welding

The embodiment of the utility model discloses a positioning device for U rib welding. The positioning device comprises a transverse positioning assembly, a pressing assembly and a movable portal frame. The multiple transverse positioning assemblies and the multiple pressing-down assemblies are sequentially and alternately arranged in the walking direction perpendicular to the movable portal frame. One end of the transverse positioning assembly and one end of the pressing-down assembly are movably connected with the movable portal frame, and the other ends of the transverse positioning assembly and the pressing-down assembly abut against a U rib to be welded during working. The positioning device can be used in the welding operation of the internal or external fillet seam of the U-shaped rib, and the U-shaped rib to be welded is accurately positioned, so that the welding quality of the internal or external fillet seam of the U-shaped rib can be greatly improved. 本实用新型实施例公开了一种用于U肋焊接的定位装置，包括横向定位组件、压下组件及移动龙门架；所述横