The invention, by changes depending on the welding deformation degree generated at the time of sheet metal welded to the welding position of the welding torch is automatically and non-uniformity of the displacement and the bead caused by welding distortion arc can be prevented, and the torch by a welding improved contact roll as the instructions in the correct welding position relates to a vertical upward welding apparatus comprising a welding position can perform stable welding is variable welding torch and improving the welding contact roll.
Vertical upward welding device according to the invention, with a main body portion provided with a welding torch, the arm of the same is coupled to non-rail carriage and the main body or arm to be positioned below the welding torch is mounted on the left and right both sides of the main body through dividend there is a weld that is coupled to the main body portion so as to be located at above the assembly and welding torch comprising: a grave tracking unit, welding joints tracking unit, enters the inside of the weld improvement so as not to escape from the weld improvement formed between the base material It is configured for welding to improve the contact roll and, welding improve the contact roll having a protruding rim of a roll support member that rotatably supports, such dividend assembly, with the weld improvement between the surface of the base material in a form that is over the both sides base it is characterized in that is composed of dividend and copper, copper dividend pressing unit to push the same toward the base material to be in close contact with the dividend.