An effective method of replacing zonal focusing with an antenna array is proposed, which is traditionally used in automated ultrasonic inspection of welded joints with narrow cutting to detect defects at the fusion boundary. This method, based on the use of multi-circuit digital focusing antenna technology (CFA), allows you to obtain and analyze high-quality images of reflectors. The proposed method, compared with zonal focusing made using phased array technology (HEADLIGHTS), is less sensitive to the accuracy of positioning the antenna array relative to the seam axis and to changes in the thickness of the control object, makes it possible to estimate the height of defects not by amplitude, but by the size of the glare reflectors.