Arch assembly welding positioner of jar body

The utility model relates to an arch assembly welding positioner of jar body, including stand, radian master plate, arc supporting rib, sideboard and the spacing backup plate of arc length, be fixed with the radian master plate in the upper end of stand, be fixed with the arc supporting rib more than two on the excircle of radian master plate, arc supporting rib highly equals, arc supporting rib'slength direction is unanimous with the length direction of radian master plate, align with the both ends that correspond of radian master plate in arc supporting rib's both ends, inner lower surfaceand outer end lower surface at the radian master plate all are fixed with along radian master plate length direction's sideboard, the both ends of controlling of radian master plate are stretched outat both ends about the sideboard, all be fixed with the spacing backup plate of arc length on the sideboard that corresponds radian master plate both ends position about. The utility model is suitablefor a check -up of arc stee