Downward welding tool for pipe fittings

The invention provides a downward welding tool for pipe fittings, and belongs to the technical field of downward welding auxiliary equipment. According to the technical scheme, the downward welding tool comprises a bottom frame, an angle adjusting mechanism and a pipe fitting clamping mechanism which are arranged on the bottom frame, wherein the bottom frame comprises a base, a stand column is arranged on the base, a lifting sleeve sleeves the periphery of the stand column, a protective shell is arranged on the side face of the lifting sleeve, the angle adjusting mechanism is arranged in the protective shell, the angle adjusting mechanism comprises a spherical shell movably arranged in the protective shell, a first connecting rod is arranged between the inner walls of the spherical shell, a first driving motor is arranged in the rectangular shell, a second connecting rod is arranged on the first driving motor, the free end of the second connecting rod is arranged on the periphery of the first connecting rod i