JTGF series high negative pressure dust collector is specially designed for the dry, oil-free and non-corrosive welding flue gas produced in the process of welding, cutting and grinding. High negative pressure dust collector adopts high pressure fan with air pressure greater than 10kPa, vacuum suction mode, high pressure head, small suction pipe, convenient suction tuyere close to the dust point, and realize the synchronization of suction tuyere and welding action. Such as: gas protection welding can be used suction welding gun, (suction welding gun is the air suction nozzle and welding gun into one, so that the distance between the air outlet and the smoke source is only a few centimeters, so the air effect is very good, harmful gas can be away from the breathing area.) In the operation of workers, as long as the suction torch is moved, the suction nozzle will move synchronously, without additional actions, for some more complex structural parts, as well as the narrow space, poor ventilation of the welding plant, its dust suction method and dust removal effect can not be replaced.