METHOD OF AUTOMATIC ARC WELDING BY NONCONSUMABLE ELECTRODE AND DEVICE TO THIS END Russian patent published in 2013 - IPC B23K9/10 

FIELD: process engineering.

SUBSTANCE: invention relates to welding in protective gases by consumable electrode, primarily, to circular welding of pipeline fixed joints. In welding, frequency filtration of arc voltage disturbances proportional to difference between current arc voltages and arc setting voltage for selected welding mode is performed to provide data on weld seam quality. Arc voltage automatic adjustment system is periodically switched off at frequency of 0.8-1.2 Hz and in 0.10-0.15 s interval current arc voltage difference and voltage setting magnitudes are compared with preset reference voltage magnitudes, its level corresponding to the least magnitude of arc voltage disturbance occurring at nonconsumable electrode working part erosion. In case reference voltage level reached or exceeds, welding is automatically switched off to replace nonconsumable electrode.

EFFECT: higher welding quality.

3 cl, 3 dwg