Welding is a reliable process for low-cost, high-tech joining materials. So far, no other process has been more widely used for joining materials than welding, and it has added more value to the welded products. Therefore, both now and in the future, welding is the preferred process for successfully processing various materials into marketable products. It can not only solve the connection of various steels, but also solve non-ferrous metals such as aluminum and copper, titanium, zirconium, etc. The connection of special metal materials has been widely used in machinery manufacturing, shipbuilding, automobile manufacturing, petrochemical, aerospace technology, construction engineering and other industries, and has also expanded to electronic devices, household appliances, medical equipment, communications engineering and other fields.