BUTT WELDING METHOD FOR TUBE

PURPOSE:To easily perform a stabilized butt welding with automatic welding without using a brazing filler metal by making a slit work near the tube but end part and by melting the annular part between the butt part and slit. CONSTITUTION:An annular part 5 is formed by working a slit 3 near the butt end 2 of a tube 1' and the tube 1 of an 'Inconel 600(R)' and its automatic welding is performed by the arc of a torch T without adding any filler metal. The generation of easily tracing deposited metal is thus eliminated by the dilution of the mutual components of both rubes 1, 1' and the dilution ratio of the components can be varied as well. Consequently as stable butt welding can be thus performed easily with automatic welding without using filler metal.