Square frame right-angle welding tool

The utility model discloses a square frame right-angle welding tool which comprises a 45-degree welding tool, and a 90-degree welding tool is arranged on the outer surface of the upper end of the 45-degree welding tool. The utility model discloses a right-angle welding tool for a square frame. A 45-degree welding tool is arranged and comprises a 45-degree welding platform, a tool containing limiting piece, a mounting sliding block, a sliding block base, a fixed clamping air cylinder, a clamping pressing plate, a clamping piece, a right-angle limiting block and a bearing base, and a 90-degree welding tool is arranged and comprises a 90-degree welding platform, a rotating shaft, a rotating groove, a fixed air cylinder, a clamping component and a positioning limiting piece. The workpiece can be used for clamping and welding 45-degree and 90-degree welding surfaces of a square frame, the clamp is compact and stable in structure, high in reliability, small in occupied space, capable of being universally used for w