The electric conductor between the source of arc welding current and the work.
A process that produces coalescence of materials by heating them to the welding temperature, with or without the application of pressure or by the application of pressure alone, and with or without the use of filler metal. Welding occurs when the temperature exceeds the melting temperature of the base metals.
When a welder is certified to work on a project, that welder must prove that they are proficient in the welds that will be needed. Generally the welder will go to a third-party testing facility and pass a welding inspection on one or more positions. The chart shown on the left is the most common of welding positions for testing.