Friction welding device for pipe orifice machining

The utility model relates to the technical field of pipe orifice processing, in particular to a friction welding device for pipe orifice processing, which comprises a welding machine main body and a placing plate, one end of the welding machine main body is fixedly connected with a limiting device for clamping and limiting the placing plate, and one end of the welding machine main body is fixedly connected with a switch button. One end of the switch button is arranged on the welding machine main body, the other end of the switch button is provided with a protection device for preventing the switch button from being touched by mistake, and the protection device is fixedly connected with the welding machine main body. When the placing plate is disassembled, only the limiting pin and the placing plate need to be separated through the shifting rod, operation is easy, workers can conveniently install and use the placing plate, protection of the switch button is achieved through the baffle, it is guaranteed that th