Welding Machine Welding Machines: A Guide Welding machines are essential tools used to join metals together by applying heat and pressure. They are widely used in various industries, including construction, manufacturing, and automotive. Types of Welding Machines There are several types of welding machines, each with its own unique characteristics and applications: Shielded Metal Arc Welding (SMAW): This is a common type of welding that uses a coated electrode to create an electric arc between the electrode and the workpiece. The coating on the electrode provides a protective gas shield and slag.