**6. Conclusions**

This chapter dealt with the resistance spot welding technique and their various working principles and applications. Resistance spot welding is mainly used for the joining of thin metal sheets and their alloys. The difficulties associated with the joining of highly thermally conductive metals like aluminum and magnesium were also discussed. The power supply used was also discussed. Various techniques have also been discovered by researchers to enhance the joint strength of the weldments. The techniques included the use of double-pulse welding current and various metallic or non-metallic interlayers. Also, the broad field of applications of resistance spot welding was mentioned, and also a modified RSW technique which is the projection welding was also elaborated in this chapter.
