Welder (noun)

1. A person whose job is to join metal parts together using heat and pressure.
2. A machine or tool used for welding.

Origin:

From the verb weld, which comes from the old english word wealdan meaning to join or bind.

Examples:

1. The welder carefully joined the two metal plates together using a high-powered torch.
2. The welding process required a skilled welder to ensure a strong and secure joint.
3. The welder had to wear protective gear to shield himself from the intense heat and light.
4. The new welder on the construction site needed some training before he could start working.
5. The repair shop had a specialized welder for aluminum and another for steel.