Abstract: In view of the problems such as high requirements for welding skills and poor stability of welding quality when using handheld submerged arc stud welding for the T-joints of nuclear power steel bar embedded parts, the automatic submerged arc stud welding technology driven by a servo motor was proposed. A special device was developed in terms of the selection of welding power sources, the design of submerged arc stud welding torches, and the design of control systems. Welding procedure qualifications and batch simulated welding tests for steel bars with diameters of φ20mm and φ28mm were carried out, and batch applications in nuclear power plants were achieved. The results showed that the non-destructive, physical and chemical performance indicators of the automatic submerged arc stud welding joints all meet the standard requirements. Compared with handheld submerged arc stud welding, automatic submerged arc stud welding has obvious advantages in terms of welding efficiency, welding quality, and cost, and has broad application prospects in the welding of embedded steel bars for nuclear power.