Installation arc welding comprising several electrode arc welding of the double flow, each of which with a non-consumable electrode suitable for pipe welding wherein the electrode tip is located in the plane of the internal nozzle.

摘要

Installation arc welding comprising several electrode (1) arc welding each comprising an electrode (2) tungsten with a pointed end (5) (7), characterized in that each electrode holder (1) comprises an inner nozzle (3 ) surrounding the electrode (2) and an external nozzle (4) surrounding said internal nozzle (3), the annular flange (6) of the end of the inner nozzle (3) and the tip (7) of the electrode (5) they are located substantially in the same plane, wherein the distance (d) separating the first plane (P) perpendicular to the perpendicular axis of the electrode (2) and passing at the level of the surface of the flange (6) annular located in the end of the inner nozzle (3) of a second plane (P ') passing through the pointed end (7) of the electrode (2) and which is parallel and is located above or below the first plane (P) is such that: 0 _ d 1 mm, and the internal nozzle (3) has an outlet orifice with a diameter between 5.3 and 7 mm.