Aluminum is the industry's most widely used non-ferrous structural materials have been widely used in the automotive, machinery, shipbuilding and chemical industry. With the recent science and technology and the rapid development of industrial economy, the demand for aluminum alloy welded structure is increasing, so that the welding of aluminum along with in-depth. Aluminum alloy widely used to promote the development of aluminum alloy welding technology, welding technology development and also expand the application fields of aluminum, aluminum welding technology is becoming a hot research.