Special tool for welding outer flange core connecting ring assembly at double-wall pipe splicing position

The utility model belongs to the technical field of double-wall pipe splicing, and provides a special tool for welding an outer flange core connecting ring component at a double-wall pipe splicing position, which comprises a positioning flange, a positioning shaft, a front anti-falling part, a pressing flange and a rear anti-falling part, the front anti-disengaging part and the rear anti-disengaging part are fixed to the front end and the rear end of the positioning shaft respectively, the front anti-disengaging part and/or the rear anti-disengaging part are/is detachably fixed to the positioning shaft, the positioning flange and the pressing flange are fixed, and the positioning flange and the pressing flange jointly clamp an outer flange core between the positioning flange and the pressing flange. The positioning shaft is sleeved with a low-heat-conduction bridge inner cylinder in a penetrating mode, the front end of the low-heat-conduction bridge inner cylinder abuts against the rear end of the positioning