Tig welding method and welding apparatus

B - Operations – Transporting – 23 – K

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Details

B23K 9/16 (2006.01) B23K 9/02 (2006.01) B23K 9/167 (2006.01)

Patent

CA 2240219

A TIG welding apparatus comprises a welding current supply means for supplying an electric current, a shield gas supply means for supplying shield gases, a tungsten electrode connected to the welding current supply means, a welding torch disposed coaxially around the tungsten electrode and provided with inner and outer double gas shields having gas jetting nozzles through which the gases are jetted, a plurality of wires to be fed to a portion at which the gases are jetted through the gas jetting nozzles, a wire feeding means, and a heating means connected to the wires, except at least one wire, for heating the wires. A TIG welding method is carried out by using such welding apparatus through the steps of supplying shield gases into the inner and outer gas shields and jetting the shield gases through the jetting nozzles to a portion at which a welding arc is generated, feeding continuously wires, except at least one wire, under a condition heated by the heating means to that portion as hot wires through the wire feeding means and feeding continuously the at least one wire under a condition not heated to the portion as cold wire through the wire feeding means substantially at the same time of the feeding of the hot wires.

La présente invention porte sur une soudeuse à l'électrode de tungstène TIG comprenant une source de courant électrique pour le soudage, un dispositif d'apport de gaz de protection, une électrode de tungstène reliée à la source de courant de soudage, un chalumeau soudeur, disposé de façon coaxiale autour de l'électrode de tungstène, comportant un double écran interne et externe de gaz de protection, des buses d'éjection de gaz, plusieurs fils à introduire dans la partie des buses par où les gaz sont éjectés, un dispositif d'alimentation en fils et un dispositif de chauffage raccordé à aux fils, à l'exception d'au moins un fils, en vue de les chauffer. Une méthode de soudage TIG est mise en oeuvre au moyen d'une telle soudeuse, selon les étapes suivantes : alimentation des gaz de protection dans les écrans interne et externe; éjection de ces gaz par les buses vers la portion où l'arc de soudage est produit; introduction en continu et chauffage des fils dans cette portion, sauf au moins un fil. Le fil qui reste est introduit en continu et à froid dans cette portion essentiellement en même temps que les fils chauffés.

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