Final answer:
The joint mentioned refers to a properly spaced welding joint that allows for a strong, seamless union, much like the primary union condition in wound healing which aids in quick and thorough recovery.
Step-by-step explanation:
The joint that is spaced so that the edges draw together as you weld is designed based on the concept of primary union condition. This is a term in medicine that describes how the edges of a wound are brought together to allow for quick and thorough healing.
In welding, a similar principle applies to the edges of the material being welded. When these edges are properly aligned and spaced, they can be drawn together during the welding process to create a strong, seamless joint. Proper spacing is crucial for the strength and integrity of the joint, ensuring that the welded pieces are securely joined without gaps or weaknesses.