The purpose of using a robotic arm in spot welding is to automate the welding process, which improves efficiency, productivity, and quality. Robotic arms are designed to precisely control the position, orientation, and movement of the welding electrode, which results in accurate and consistent welds. The arm can be programmed to weld complex shapes and patterns, which would be difficult to achieve manually. Using a robotic arm also increases safety in the workplace by reducing the need for human intervention in the welding process. The arm can work in hazardous environments, such as high-temperature areas, without risking the health and safety of human workers.