Novel gas protection device for welding seam inside butt joint of heat exchange tube

The utility model discloses a novel heat exchange tube butt joint internal welding seam gas protection device which comprises a gas inlet pipe and a gas inlet tee joint, the two sides of the gas inlet tee joint are communicated with two gas outlet tee joints respectively, and the ends, away from each other, of the two gas outlet tee joints are both communicated with two gas outlet pipes. A connecting block is fixedly installed at the end, away from the air outlet tee joint, of the air outlet air pipe, a threaded ring is in threaded connection with the interior of the connecting block, and a connecting air pipe communicates with the end, away from the connecting block, of the threaded ring. Four gas outlet pipes are respectively inserted into one end of a heat exchange pipe to be welded, the gas inlet pipes are communicated with a protective gas cylinder, a valve is opened, argon is started to be filled, the protective gas is shunted by using the device, and meanwhile, internal welding seams of a plurality of