Answer:
Arc welding
Step-by-step explanation:
A welder uses high electric current to create an electric arc that produces heat for joining metal. The process is commonly known as arc welding. In arc welding, the electric arc is formed between the welding electrode and the workpiece, and the intense heat generated at the arc melts the metal, allowing it to fuse and form a strong bond when it cools. This method is widely used in various industries for joining metals.