Method of and device for arc welding with consumable electrode using in alternance short circuit welding cycles and pulsed transfer welding cycles

摘要

The method comprises performing welding cycles using transfer pulse and short-circuit, comprise moving an electrode at a velocity (V 1) during arcing period, and moving the electrode at a velocity (V p) during the transfer pulse welding cycle, where: the velocity (V p) is greater than the velocity (V 1); and the arcing period is followed by short-circuit period in which molten metal establishes a short-circuit with a molten bath. The method further comprises parametering the welding cycles using short-circuit and the welding cycles using transfer pulse. The method comprises performing welding cycles using transfer pulse and short-circuit, comprise moving an electrode at a velocity (V 1) during arcing period, and moving the electrode at a velocity (V p) during the transfer pulse welding cycle, where: the velocity (V p) is greater than the velocity (V 1); and the arcing period is followed by short-circuit period in which molten metal establishes a short-circuit with a molten bath. The method further comprises parametering the welding cycles using short-circuit and the welding cycles using transfer pulse according to the welding operation to be performed. The transfer pulsed welding cycles are sandwiched between the welding cycles by short circuit during the arcing period. The velocity (V p) of the movement of the electrode is constant. The welding cycle using transfer pulse comprises hot stage during which the electrode is supplied with a current having an intensity (I(H)) and a cold stage during which the electrode is supplied with a current having an intensity (I(B)) that is less than (I(H)), where the moving speed of the electrode varies between a value (V(PH)) during hot stage and a value (V(PB)) during the cold stage. The welding cycles using short-circuit comprise maintaining a supply current (I 2) of the consumable electrode during the arching period at the same time that the movement of the electrode at a velocity of (V 1), decreasing the intensity to reach a minimum intensity (I1), decreasing the velocity of the movement of the electrode to a value (V 3) during the short-circuit period, increasing the intensity during the short-circuit period to a value (V 4), and decreasing the intensity to reach I 1less than I 2. The intensity of the supply current varies according to a slope using the transfer pulsed welding cycle. An independent claim is included for an arc welding device.