SU361026A1 - METHOD OF ARC WELDING BY FLOATING ELECTRODE - Google Patents

Description

one

This invention relates to the field of welding iron manufacture.

There is a known method of arc welding with a melting electrode, in which a arc is impacted by a control magnetic field oscillating it along a welding seam. However, the known method does not allow to obtain high welding quality due to strong spattering of the electrode metal.

To eliminate this drawback, according to the proposed method, the control magnetic field, the frequency of which is chosen equal to the transition frequency of molten metal droplets from the electrode to the bath, is applied to the arc after a drop is formed on the electrode, while the magnetic field first moves the arc to the side of the molten weld pool metal, and then in the opposite direction, where they keep the arc until the drop is removed from the electrode.

The welding according to the proposed method is carried out as follows.

An arc is ignited between the electrode and the product connected to the terminals of the power supply in one of the known methods. When the arc is burning, the electrode melts and forms a drop, as well as the formation of a liquid bath on the product. After the droplet forms on the electrode, a transverse magnetic field of such polarity is applied,

which displaces the arc by a drop in the direction of the bath. Depending on the size of the welding current and the length of the arc, the magnitude of the magnetic field strength is such that the speed of the arc movement exceeds 2 m / s. The time of exposure to the magnetic field in order to displace the arc in the direction of the bath is chosen such that the arc has time to shift to the edge of the drop. After the arc is displaced by a drop in the direction of the bath, the polarity of the magnetic field is changed. As a result, the arc shifts in the opposite direction in the direction of welding, escapes from under the drop, and does not prevent the drop from passing into the bath.

The time during which the arc is removed from under the drop is taken longer than the formation and explosion of the cheek between the drop and the bath.

The frequency of the magnetic field should be equal to the frequency of droplets transfer from the electrode to the bath and is set by feedback from the welding process, for example from the moment of the drop transfer from the electrode to the bath.

Subject invention

The method of arc welding with a melting electrode, in which the arc is influenced by a control magnetic field oscillating it along the weld, characterized in that, in order to improve the quality of welding and reduce spatter 3, the control magnetic field, the frequency of which is chosen equal to the transition frequency droplets of molten metal from the electrode into the bath, impose on the arc after each 5 formation 4 drops on the electrode, while the magnetic field first moves the arc towards the molten metal of the weld pool, and then in the opposite direction, where an arc to hold a tear drop electrode.