| 摘要 |
Disclosed is an automatic welding apparatus for upward welding of curved joints having a plurality of welding nozzles mounted on an arm for independent or separate movement in directions tangent and normal to the welding line, the arm being carried by a column for free vertical and horizontal movement, and a nozzle orientation controlling mechanism adapted to rotate the welding nozzles on the arm to put the welding wire fed from the welding nozzle in parallel with a line tangent to the welding line, upon detecting the inclination of the tangential line. |
