Certified Welding Inspector Practice Exam

Which process is referred to as arc cutting?

1. A method that joins metal together using heat

2. A technique that joins metals by pressure

3. A thermal cutting process that removes metal by melting

4. A type of welding that involves high temperature only

The correct answer is: A thermal cutting process that removes metal by melting

Arc cutting is specifically a thermal cutting process that employs an electric arc to generate sufficient heat to melt and remove metal. In this process, the electric arc is established between a conductive electrode and the workpiece, resulting in the metal's melting and vaporization at the molten pool. This method is widely used for cutting various metals efficiently, allowing for precise cuts and the ability to handle different thicknesses of material. The process stands apart from other methods like welding, where the primary focus is on joining metals through heat or pressure. In the case of arc cutting, eliminating material is the main objective, distinguishing it from the practices that emphasize joining. Using heat alone does not necessarily define the arc cutting process, which requires the specific melting and removal of material rather than just heating to a high temperature. Hence, the correct identification of arc cutting as a thermal cutting process centers around its unique capability to remove material effectively, making it crucial for applications where precise cuts are necessary.