Answer:
Contact tube:
It is made of cooper,and is used to bring wielding power to the wire as well as direct the wire toward the work.
Electrode:
It is used to create an electric arc.
Shielding gas:
It prevents exposure of the molten weld pool to oxygen,nitrogen and hydrogen contained the air atmosphere.
Molten weld metal:
It is transferred into the molten weld pool.
Workpiece:
A piece of metal or other material that is in the process of being worked on/made on has actually been cut or shaped by a hand tool or machine.
This might help.
