METHOD FOR WELDING, SURFACING AND SOLDERING BY A COMBINATION OF DIRECT AND INDIRECT ARCS Russian patent published in 2021 - IPC B23K9/09 B23K9/10 

FIELD: working of metal.

SUBSTANCE: invention relates to a method for welding, surfacing or soldering with a combination of direct and indirect arcs in an inert gas environment. Melting and non-melting electrodes are used with continuous supply of a melting electrode to the item. The arcs are powered with current pulses of equal frequency on striking thereof using a high-frequency discharge. The powers of the arc pulses are adjusted, wherein the value of the pulse currents on the non-melting electrode is selected in accordance with the straight and reverse polarity currents recommended for single-arc welding from the condition of ensuring resistance thereof. The average value of the current on the melting electrode for the period is set in accordance with the recommended current for single-arc reverse polarity welding. The arcs are powered from one welding power source of alternating current pulses with a frequency of at least 50 Hz, one pole whereof is connected to one of the electrodes, and the second pole is connected to the item and to the second electrode. A valve is included in the circuit connecting the pole of the welding power source with the second electrode, and a second valve is included in the circuit connecting the power source and the item. The valves are included in the circuit so that during the passage of the direct arc pulse current from the first electrode to the item, the first valve locks the passage of the indirect arc current from the first electrode to the second electrode, and during the passage of the indirect arc pulse current between the electrodes, the second valve locks the passage of current between the first electrode and the item. The ratio of the product of the average current of the arc current pulses for the duration of action thereof is varied in the range of 0.1 to 0.9.

EFFECT: method provides a possibility of performing various technological processes during welding, surfacing and soldering of almost all structural alloys.

5 cl, 6 tbl, 9 dwg