Single pass arc welding of considerably thick metals using...

B - Operations – Transporting – 23 – K

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B23K 9/00 (2006.01) B23K 9/02 (2006.01) B23K 9/14 (2006.01)

Patent

CA 2207021

A welding method that permits thick pieces of metal to be welded together over the entire face of their touching surfaces during a process of self organizing, single pass arc welding in the ambient air without any special proofing of the welding bath melt. The higher quality and faster weld when welding considerably thick metals in a single pass is achieved by using an insulated stationary consumable electrode clamped between the parts to be welded together and by scientifically substantiated selection of the value of the electric power applied to the end face of the electrode. The arc is distinguished by the fact that the value of its power is sustained at a level which keeps the pressure of the metal vapor Pme which arises due to vaporization of the electrode material in the welding zone higher than the air pressure Patm with a relation between them complying with the rule Pme ~ (1.1-2.0)Patm. This affords protection of the welding bath metal melt against air oxidation and interaction with other air elements such as N, H, H2O, etc.

Méthode de soudage qui permet de souder ensemble deux pièces de métal épaisses sur la face totale de leurs surfaces contiguës au cours d'une opération de soudage à l'arc d'une seule passe auto-entretenue dans l'air ambiant sans protection spéciale du matériau métallique fondu du bain de soudage. La soudure de meilleure qualité réalisée plus rapidement lors du soudage de pièces métalliques épaisses d'une seule passe est obtenue en utilisant une électrode fusible fixe et isolée serrée entre les pièces à souder et en effectuant un choix justifié sur le plan scientifique de la valeur du courant électrique appliqué à la face d'extrémité de l'électrode. L'arc se caractérise par le fait que la valeur de son courant est maintenue à un niveau qui garde la pression de la vapeur de métal (Pme) qui se produit par suite de la vaporisation du matériau de l'électrode dans la zone de soudure plus élevée que la pression de l'air (Patm) selon un rapport entre les deux pressions qui suit la règle Pme ~ (1, 1-2,0)Patm. Ceci rend possible la protection du matériau métallique fondu du bain de soudage contre l'oxydation par l'air et l'interaction avec d'autres éléments comme N, H, H2O, etc..

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