The process comprises forming a weld bead along a flange of a stiffener by a rotating pin of a head of a welding system. A width of the flange of the stiffener is greater than double a maximum diameter of the rotating pin. The weld bead extends in cross section from a first lateral edge to a second lateral edge of the stiffener flange. The welding heads include a shoulder, which extends at a base of the rotating pin, and a counter-bearing unit, which has a support surface. The process comprises forming a weld bead along a flange of a stiffener by a rotating pin of a head of a welding system. A width of the flange of the stiffener is greater than double a maximum diameter of the rotating pin. The weld bead extends in cross section from a first lateral edge to a second lateral edge of the stiffener flange. The welding heads include a shoulder, which extends at a base of the rotating pin, and a counter-bearing unit, which has a support surface. The process further comprises inserting the respective rotating pins of the welding heads into a panel and into the stiffener flange, then moving the welding heads along the stiffener flange in a direction of welding, and pressing a support surface of the counter-bearing unit onto the flange of the stiffener to counteract the pressure exerted by the rotating pins. The rotating pins of the welding heads are mutually offset in a transverse direction, which is orthogonal to the direction of welding and to respective axes of rotation of each of the rotating pins. A footprint formed by all rotating pins of the welding heads extends in cross section from the first lateral edge to a second lateral edge of the stiffener flange. The welding heads are arranged according to a triangular configuration. The moving step is carried out by local softening of the material forming the panel and of the material forming the stiffener flange caused by the heat produced by the friction of the rotating pins. The welding heads include two lateral welding heads centered in relation to a given plane orthogonal to the direction of welding and a central welding head offset in the direction of welding in relation to each of the lateral welding heads. A first welding head is positioned on a web (30) of the stiffener while other two welding heads are offset in relation to the web of the stiffener, and a penetration depth of the rotating pin of the first welding head into the flange of the stiffener is less than a penetration depth of the respective rotating pins of the other two welding heads into the flange of the stiffener. The welding heads move in a direction such that the central welding head is arranged to the rear of the lateral welding heads. The support surface is formed jointly by two rollers, which are carried by the counter-bearing unit and move by rolling against the flange of the stiffener. An independent claim is included for a welding system.
PROCÉDÉ ET SYSTÈME AMÉLIORÉS DE SOUDAGE PAR FRICTION MALAXAGE D'UN RAIDISSEUR SUR UN PANNEAU D'AÉRONEF
Improved system and method for friction stir welding of a stiffener on an aircraft panel
Verbessertes Reibrührschweißverfahren und -system eines Aussteifungselements auf einem Luftfahrzeugpaneel
02.10.2019
Patent
Elektronische Ressource
Französisch
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