B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
B23K9/00—Arc welding or cutting
B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
B23K9/121—Devices for the automatic supply of at least two electrodes one after the other
Procede de soudage de canalisations metalliques du type pipeline avec variation d ' une variable electrique relative a l ' arc au cours du mouvement oscillant transverse de la torche dans le joint etroit ; dispositif de mise en oeuvre d ' un tel procede