Resistance Assisted Heating in Welding: Enhancing Formability and Eliminating Tunnel Defects

1. Resistance assisted heating can significantly improve the formability of the joint and reduce the occurrence of defects in the welding process.

2. The temperature field during the welding process is mainly affected by the welding current and the auxiliary heating temperature.

3. The material flow behavior is mainly affected by the welding speed and the auxiliary heating temperature. With the increase of the auxiliary heating temperature, the material flow becomes more uniform and the welding seam becomes more stable.

4. When the auxiliary heating temperature exceeds 100 'C, the tunnel defects in the welding seam can be effectively eliminated due to the softening effect of the material.

5. The numerical simulation results are consistent with the experimental results, which indicates that the numerical simulation can accurately predict the temperature field and material flow behavior during the welding process.

Overall, the combination of experiment and numerical simulation provides a comprehensive understanding of the welding process, and the use of resistance assisted heating can improve the quality of the joint and reduce the occurrence of defects.