Ultrasonic-assisted underwater wet welding method

The invention discloses an ultrasonic-assisted underwater wet welding method which is characterized in that an ultrasonic transducer is sealed in a waterproof shell, the shell is filled with aviation kerosene, the upper end of an ultrasonic amplitude transformer penetrates the waterproof shell and is connected with the lower end of the ultrasonic transducer in a threaded manner, an insulating sleeve penetrates the waterproof shell, is inserted into the waterproof shell from the upper end of the ultrasonic transducer and penetrates the ultrasonic amplitude transformer to reach the lower end face of the amplitude transformer, a conducting rod and a conducting nozzle are mounted in the insulating sleeve, the conducting nozzle is mounted at the lower end of the insulating sleeve and partially extends out of the ultrasonic amplitude transformer, the upper end of the conducting rod extends out of the shell and the insulating sleeve, the lower end of the conducting rod is connected with the conducting nozzle in a threaded manner, the conducting rod and the conducting nozzle are axially provided with welding wire feeding pipes, an ultrasonic power wire penetrates the waterproof shell and is connected with the ultrasonic transducer, a lifting adjustment mechanism is arranged on the conducting rod, and the conducting rod is connected with an underwater welding power supply. Arc blow and arc extinguishing rate is decreased, welding joints are uniformly formed, welding defects are decreased, and the ultrasonic-assisted underwater wet welding method has a quite large application space in the field of underwater welding.