Final answer:
Welding is a process that joins metal pieces together using heat and a joining material like solder.
Step-by-step explanation:
When pieces of metal are joined together by heating, it is called welding.
Welding is a sculptural fabrication process that uses heat and a joining material like solder to connect metal pieces. Different sources of heat, such as gas, electricity, or laser, can be used for welding.
Blacksmiths have used forge welding for thousands of years to join iron and steel pieces together.