Method for real time dynamic diagnosis and decision...

B - Operations – Transporting – 23 – K

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B23K 11/04 (2006.01) B23K 11/25 (2006.01)

Patent

CA 2420500

The invention concerns a method for data acquisition, in the form of measurements and calculations, of diagnosis and decision assistance for a direct spark butt electric welder and for the resulting weld seams comprising respectively steps which consist in: measuring the instantaneous alternating voltage at the terminals of primary winding (19, 33) and of the secondary winding (16, 35, 36) of the welder transformer, and between the jaws (18, 39) of the welding die; measuring the instantaneous current in the transformer primary winding (24, 34) and secondary winding (17, 37, 38); measuring the instantaneous displacement (41, 42) of the mobile die (4); storing said voltages, said currents and said displacement during the welding process; calculating the power supplied by the secondary winding to the dies and the heat energy dissipated during the electric spark welding, based on the displacement of the mobile die; calculating the power efficiency and based on said measurements and calculations, automatically establishing a real time diagnosis (68, 74, 78, 79, 80) with or without interactive intervention of an operator, concerning the quality of at least one weld seam which has just been produced by the welder.

Un procédé d'acquisition de données, sous forme de mesures et calculs, de diagnostic et d'aide à la décision pour une soudeuse électrique en bout par étincelage direct et pour les soudures obtenues comprend respectivement les étapes de mesure de la tension alternative instantanée aux bornes du primaire (19, 33) et du secondaire (16, 35, 36) du transformateur de la soudeuse, et entre les mors (18, 39) des mâchoires de la soudeuse; mesure du courant instantané dans le primaire (24, 34) et le secondaire (17, 37, 38) du transformateur; mesure du déplacement instantané (41, 42) de la mâchoire mobile (4); mémorisation desdites tensions, desdits courants et dudit déplacement pendant le processus de soudage; calculs de l'énergie fournie par le secondaire vers les mors et de l'énergie calorifique dissipée lors de l'étincelage, en fonction du déplacement de la mâchoire mobile; calcul de rendements énergétiques et sur base de ces mesures et calculs, établissement automatique d'un diagnostic dynamique et en "temps réel" (68, 74, 78, 79, 80), avec ou sans intervention interactive d'un opérateur, quant à la qualité d'au moins une soudure venant d'être réalisée sur ladite soudeuse.

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