Abstract: The validity of arc self-induced ultrasonic welding process on AISI316 stainless steel weld overlay was investigated by building a GTAW self-induced ultrasonic welding experimental platform. The results show that the testing of arc images and sound pressure reflects the working performance of the built platform and the validity of self-induced ultrasonic technology, which can achieve grain refinement of the weld seam without additional equipment. When the ultrasonic frequency is 60 kHz and the amplitude current is 10 A, the weld penetration depth can be increased by 59.67%, and the fusion width can be reduced by 30.14%.For the AISI 316 stainless steel weld overlay workpiece melt pool system, 40-60 kHz is close to its natural frequency, which is more conducive to obtain refined grains by inhibiting dendrite growth.