Fixing and supporting base for welding machining

The fixing and supporting base for welding machining comprises a positioning base, a heat dissipation mechanism is installed in the middle of the upper surface of the positioning base, and the heat dissipation mechanism comprises a heat insulation cover body, an installation notch, an air inlet barrel, a draught fan and an air outlet notch. Clamping mechanisms are fixedly installed on the portions, located on the two sides of the heat dissipation mechanism, of the upper surface of the positioning base, each clamping mechanism comprises a clamping buckle, a buckle base, an upper clamping base, a guide roller, a lower clamping base and a connecting rotating shaft, positioning supporting feet are fixedly installed on the front side and the rear side of each lower clamping base correspondingly, and positioning bolts are installed on the positioning supporting feet; positioning screw holes are formed in the positions, located below the positioning supporting feet, of the surface of the positioning base, the heat i