This job involves using specialized tools and equipment to join metal components together. The Welder will use a variety of welding techniques, such as arc welding, gas welding, and oxy-acetylene welding, to create strong and durable welds. The Welder must be able to read and interpret
From Wikipedia
A welder is a person or equipment that fuses materials together. The term welder refers to the operator, the machine is referred to as the welding power supply. The materials to be joined can be metals or varieties of plastic or polymer. Welders typically have to have good dexterity and attention to detail, as well as technical knowledge about the materials being joined and best practices in the field.