A circle at the joint in a welding symbol signifies what?

The presence of a circle at the joint in a welding symbol indicates a continuous weld all around. This symbol signifies that the weld should encircle the entire joint area without any interruptions, ensuring a robust and seamless bond between the materials being welded.

Using a circle in this context provides a clear and standardized way for welders and fabricators to understand the specific requirement for how the weld should be applied. This is crucial in various applications for creating strong structural integrity, especially in situations where strength is paramount, and there should be no gaps or weaknesses in the welded joint. The clarity of this symbol helps prevent misinterpretation during the welding process, ultimately contributing to the safety and durability of the final product.

In contrast, the other options do not convey this specific requirement for continuous welding, thus making them less relevant in this context.