Final answer:
A fillet weld is a type of weld that is used to prevent leakage of threaded joints. It does not provide significant strength to the joint.
Step-by-step explanation:
The type of weld that is considered to furnish no strength and is only used to prevent leakage of threaded joints is called a fillet weld.
A fillet weld is a type of weld that is used to join two pieces of metal at an angle or perpendicular to each other. It is commonly used in applications where strength is not the primary concern, such as in the construction of tanks, pipes, and other structures with threaded joints.
Unlike other types of welds, such as butt welds or groove welds, fillet welds do not provide significant strength to the joint. Instead, they serve to prevent leakage and provide a seal between the threaded parts.