Final answer:
A weld that is made by filling a hole in an overlapping member to attach to the member below is known as a plug weld or slot weld, which is part of the welding process in metal fabrication.
Step-by-step explanation:
A weld produced by filling an elongate hole in an overlapping member and attaching it to the member underneath is referred to as a plug weld or sometimes as a slot weld. In the context of welding, this process is used to join two pieces of metal together securely. Welding is a skilled trade and an essential process in metal fabrication that has been a cornerstone in construction and manufacturing for millennia, evolving from the traditional forge welding practiced by blacksmiths to modern methods that use various sources of heat including gas, electricity, and laser.