Final answer:
In arc welding, 'weld metal' refers to the fused portion of base metal with the filler rod, which solidifies to form the joint between two pieces. It results from the controlled melting of the metals involved by the heat of an electric arc.
Step-by-step explanation:
The term weld metal when referring to arc welding specifically denotes the b. The fused portion of base metal with filler rod. During the arc welding process, a significant amount of heat is generated by an electric arc, which melts both the base metal and the filler metal. Once cooled, this creates the weld metal - a new part made of the previously separate pieces and the filler material that has solidified to connect them. This weld metal is critical for the durability and strength of the welded joint.
Metals used in welding are generally chosen for their ability to conduct heat and electricity, as well as being malleable and ductile. Such properties allow the metal to be shaped, manipulated, and combined effectively during the welding process. Common metals used are iron, steel, aluminum, and copper, which exhibit favorable qualities like luster and thermal conductivity.
It is important to differentiate the weld metal from the entire welded structure or the metal the weld is made on. The weld metal is a product of the welding process itself. Understanding this helps in selecting the appropriate materials and methods for any arc welding project.