Welding method and apparatus

摘要: 888,946. Welding by fusion. CYCLOMAGIC Inc. April 27, 1960, No. 14679/60. Class 83 (4). In an arc welding device for making a circumferential weld on cylindrical workpiece, frame attachable to the workpiece has annular track carriage supporting welding-torch and rotatable about motor mounted frame. The torch 17 is rotated through 372 degrees during overlap current reduced. 25 in two hinged parts which may be secured one of pipes 13, 14 butt welded. 16 form semi-circular segments gear carrying odd number rollers 46 when are connected together run groove 47 25. 18 pinion 54 engaging toothed rim 16. A gas shielded carried bracket segments. generator, control panel bottle 21 supplying argon, helium, nitrogen or carbon dioxide inside trolley 19. Highfrequency used initiating arc.