Combined welding device of desk supporting mechanism and combined welding method of combined welding device

The invention discloses a combined welding device of a desk supporting mechanism and a combined welding method of the combined welding device and belongs to the technical field of welding. The combined welding device comprises a combined platform, a top support is fixed to the upper portion of the combined platform, and a rotating disc assembly is installed on the top support; a first positioning assembly used for positioning the longitudinal supporting assembly is arranged below the rotary disc assembly, second positioning assemblies distributed in a circumferential array mode are fixed to the upper portion of the combined platform, and the second positioning assemblies are used for positioning the transverse supporting assembly. According to the combined welding device, the second positioning assembly can fix the transverse supporting assembly and the supporting assembly used for reinforcing during welding, and the desk supporting machine can be turned over and turned right before discharging; the transvers