The USNT-1M arrangement is added by magnetic amplifiers , AC/DC power supply converter HLG-240H36A and additional clamping magnets. Magnetic amplifiers render possible increasing of the value of the compensated residual magnetization up to 3000 G and more. The amplifiers may be used both in operating area of the device or remote from it , therefore the efficiency of USNT-1M is highly improved and the possibilities of application are expanded. power supplu converter is intended for connecting to 220 V electric power and the clamping magnets are used for comfortable welding in overhead position.