A TUBE WELDING APPARATUS

摘要

PURPOSE: A tube welding apparatus is provided to prevent the oxidation of a welding surface even using a small amount of inactive gas by concentrically spraying the inactive gas to the welding surface. CONSTITUTION: A tube welding apparatus comprises a welding unit which welds a contact portion of a tube, a first protective unit which sprays inactive gas to the tube, and a second protective unit which sprays the inactive gas to a welded surface of the tube. The second protective unit comprises a pipe part(32) having a space(32s) in which the tube is transferred, a distributing part(34) which is formed in the longitudinal direction of the pipe part and has a space(34s) formed on the transfer path of the welded surface of the tube inside the pipe part, and a gas inlet(39) for drawing in the inactive gas.